[AZ-794] [AZ-795] [AZ-796] Strict input validation + z/x/y rename

AZ-794: rename inventory wire fields tileZoom/tileX/tileY -> z/x/y
to match the slippy-map URL convention. Contract bumped to v2.0.0.

AZ-795: shared validation infrastructure -- FluentValidation +
ValidationEndpointFilter + GlobalValidatorConfig (camelCase paths).
GlobalExceptionHandler now converts JsonException (UnmappedMember +
JsonRequired) into RFC 7807 ValidationProblemDetails. JSON layer
hardened with UnmappedMemberHandling.Disallow + camelCase naming
policy. New error-shape.md contract.

AZ-796: InventoryRequestValidator covers 9 rules (XOR tiles vs
locationHashes, cap 1000, z 0..22, x/y in slippy bounds, hash
length/charset). 16 unit tests + 16 integration tests + a manual
curl probe script.

Adjacent fixes uncovered by the new strict layer:
- IdempotentPostTests RoutePoint payload corrected to lat/lon
  (the DTO has used JsonPropertyName for ages; previously silently
  ignored under PascalCase fallback).
- TileInventoryTests slippy x/y reduced to fit z=18 bounds.
- docker-compose.yml host port for Postgres moved 5432 -> 5433 to
  avoid sibling-project conflict; appsettings.Development + README
  + AGENTS + architecture + containerization docs aligned.

New coderule (suite + repo): API consumer-facing OpenAPI
descriptions must not contain task IDs, contract filenames, or
version-bump history -- internal change tracking belongs in
commits/contract docs/changelogs. Existing offending descriptions
in Program.cs cleaned up.

Co-authored-by: Cursor <cursoragent@cursor.com>

.cursor/rules/coderule.mdc

@@ -11,6 +11,7 @@ alwaysApply: true
 - Avoid boilerplate and unnecessary indirection, but never sacrifice readability for brevity.
 - Never suppress errors silently — no `2>/dev/null`, empty `catch` blocks, bare `except: pass`, or discarded error returns. These hide the information you need most when something breaks. If an error is truly safe to ignore, log it or comment why.
 - Do not add comments that merely narrate what the code does. Comments are appropriate for: non-obvious business rules, workarounds with references to issues/bugs, safety invariants, and public API contracts. Make comments as short and concise as possible. Exception: every test must use the Arrange / Act / Assert pattern with language-appropriate comment syntax (`# Arrange` for Python, `// Arrange` for C#/Rust/JS/TS). Omit any section that is not needed (e.g. if there is no setup, skip Arrange; if act and assert are the same line, keep only Assert)
+- API consumer documentation (OpenAPI / Swagger `Description` and `Summary`, REST API reference docs, public SDK docstrings) is written for the *external API consumer*, not the implementer. Do NOT include task IDs (`AZ-NNN`, `JIRA-NNN`), contract-doc filenames (`tile-inventory.md v2.0.0`), version-bump history, or implementation milestones in these strings. Internal change tracking belongs in commit messages, contract docs, changelogs, and code comments — never in the public API description. Extend an existing pattern only if it already follows this rule; if the existing description leads with internal noise, treat that as a defect and clean it (or surface it to the user) rather than propagating it.
 - Do not add verbose debug/trace logs by default. Log exceptions, security events (auth failures, permission denials), and business-critical state transitions. Add debug-level logging only when asked.
 - Do not put code annotations unless it was asked specifically 
 - Write code that takes into account the different environments: development, production

AGENTS.md

@@ -177,7 +177,7 @@ docker-compose -f docker-compose.yml -f docker-compose.tests.yml up --build --ab
 ### Configuration Values
 
 Development defaults:
-- PostgreSQL: localhost:5432, user/pass: postgres/postgres
+- PostgreSQL: localhost:5433 (host-side, mapped to container port 5432), user/pass: postgres/postgres
 - API: http://localhost:5100
 - Max zoom level: 20
 - Default zoom level: 18

README.md

@@ -434,7 +434,7 @@ Log level can be adjusted in `appsettings.json` under `Serilog:MinimumLevel`.
 
 ### Service won't start
 - Check Docker is running
-- Verify ports 5100 and 5432 are available
+- Verify ports 5100 and 5433 are available (Postgres host-side; the container itself listens on 5432 inside the docker network)
 - Check logs: `docker-compose logs api`
 
 ### Tiles not downloading

SatelliteProvider.Api/GlobalExceptionHandler.cs

@@ -1,3 +1,4 @@
+using System.Text.Json;
 using Microsoft.AspNetCore.Diagnostics;
 using Microsoft.AspNetCore.Mvc;
 
@@ -60,6 +61,30 @@ public sealed class GlobalExceptionHandler : IExceptionHandler
     {
         httpContext.Response.StatusCode = badRequest.StatusCode;
 
+        // AZ-795: deserialization failures (unknown field via UnmappedMemberHandling.Disallow,
+        // type mismatch, malformed JSON) surface here as BadHttpRequestException with a
+        // System.Text.Json `JsonException` somewhere in the inner-exception chain. Convert
+        // them to RFC 7807 ValidationProblemDetails so wire-format errors share the same
+        // shape as FluentValidation business-rule errors — see
+        // `_docs/02_document/contracts/api/error-shape.md`.
+        var deserializationErrors = TryExtractDeserializationErrors(badRequest);
+        if (deserializationErrors is not null && badRequest.StatusCode == StatusCodes.Status400BadRequest)
+        {
+            var validation = new ValidationProblemDetails(deserializationErrors)
+            {
+                Status = badRequest.StatusCode,
+                Title = "One or more validation errors occurred.",
+                Type = "https://tools.ietf.org/html/rfc7231#section-6.5.1",
+            };
+
+            await httpContext.Response.WriteAsJsonAsync(
+                validation,
+                options: null,
+                contentType: "application/problem+json",
+                cancellationToken: cancellationToken);
+            return;
+        }
+
         var problem = new ProblemDetails
         {
             Status = badRequest.StatusCode,
@@ -73,4 +98,36 @@ public sealed class GlobalExceptionHandler : IExceptionHandler
             contentType: "application/problem+json",
             cancellationToken: cancellationToken);
     }
+
+    private static IDictionary<string, string[]>? TryExtractDeserializationErrors(BadHttpRequestException ex)
+    {
+        var current = ex.InnerException;
+        while (current is not null)
+        {
+            if (current is JsonException jsonEx)
+            {
+                var path = NormalizeJsonPath(jsonEx.Path);
+                var message = string.IsNullOrEmpty(jsonEx.Message)
+                    ? "Invalid JSON."
+                    : jsonEx.Message;
+
+                return new Dictionary<string, string[]>
+                {
+                    [path] = new[] { message }
+                };
+            }
+
+            current = current.InnerException;
+        }
+
+        return null;
+    }
+
+    private static string NormalizeJsonPath(string? path)
+    {
+        if (string.IsNullOrEmpty(path)) return "$";
+        return path.StartsWith("$.", StringComparison.Ordinal)
+            ? path.Substring(2)
+            : path;
+    }
 }

SatelliteProvider.Api/Program.cs

@@ -1,3 +1,4 @@
+using FluentValidation;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Http.Features;
 using Microsoft.AspNetCore.Mvc;
@@ -8,6 +9,7 @@ using SatelliteProvider.Api;
 using SatelliteProvider.Api.Authentication;
 using SatelliteProvider.Api.DTOs;
 using SatelliteProvider.Api.Swagger;
+using SatelliteProvider.Api.Validators;
 using SatelliteProvider.DataAccess;
 using SatelliteProvider.DataAccess.Repositories;
 using SatelliteProvider.DataAccess.TypeHandlers;
@@ -98,14 +100,28 @@ builder.Services.AddCors(options =>
 builder.Services.AddProblemDetails();
 builder.Services.AddExceptionHandler<GlobalExceptionHandler>();
 
+// AZ-795: strict JSON parsing — unknown fields are rejected at the deserializer
+// level instead of being silently dropped. Pairs with the per-endpoint
+// FluentValidation filter (`WithValidation<T>()`) so the API has a single
+// uniform RFC 7807 error contract for both wire-format failures and
+// business-rule failures (`_docs/02_document/contracts/api/error-shape.md`).
 builder.Services.ConfigureHttpJsonOptions(options =>
 {
     options.SerializerOptions.PropertyNamingPolicy = System.Text.Json.JsonNamingPolicy.CamelCase;
     options.SerializerOptions.PropertyNameCaseInsensitive = true;
+    options.SerializerOptions.UnmappedMemberHandling = System.Text.Json.Serialization.JsonUnmappedMemberHandling.Disallow;
     options.SerializerOptions.Converters.Add(
         new System.Text.Json.Serialization.JsonStringEnumConverter(System.Text.Json.JsonNamingPolicy.CamelCase));
 });
 
+// AZ-795: register every IValidator<T> in this assembly with DI so the
+// generic ValidationEndpointFilter<T> can resolve them at request time.
+// GlobalValidatorConfig.ApplyOnce() centralizes process-wide FluentValidation
+// configuration (camelCase property paths, etc.) so the API host and the
+// unit-test fixture share one source of truth — see error-shape.md Inv-4.
+builder.Services.AddValidatorsFromAssemblyContaining<Program>();
+GlobalValidatorConfig.ApplyOnce();
+
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen(c =>
 {
@@ -199,13 +215,14 @@ app.MapGet("/api/satellite/tiles/mgrs", GetSatelliteTilesByMgrs)
 
 app.MapPost("/api/satellite/tiles/inventory", GetTilesInventory)
     .RequireAuthorization()
+    .WithValidation<TileInventoryRequest>()
     .Accepts<TileInventoryRequest>("application/json")
     .Produces<TileInventoryResponse>(StatusCodes.Status200OK)
     .ProducesProblem(StatusCodes.Status400BadRequest)
     .WithOpenApi(op => new(op)
     {
         Summary = "Bulk tile inventory lookup by (z,x,y) coords or location_hash",
-        Description = "AZ-505 / `tile-inventory.md` v1.0.0. Body MUST populate exactly one of `tiles` (array of `{tileZoom,tileX,tileY}`) OR `locationHashes` (array of UUIDv5). Response order matches request order. Returns one entry per request item with `present: true|false`; when present, identity + recency fields are included. Hard cap: 5000 entries per call (HTTP 400 above)."
+        Description = "Body MUST populate exactly one of `tiles` (array of `{z, x, y}` slippy-map coordinates) OR `locationHashes` (array of UUIDv5 hashes) — sending both, or neither, is HTTP 400. Response order matches request order; each entry reports `present: true|false`, and when present includes `id`, `capturedAt`, `source`, `flightId`, `resolutionMPerPx`. Hard cap: 5000 entries per request."
     });
 
 app.MapPost("/api/satellite/upload", UploadUavTileBatch)
@@ -216,7 +233,7 @@ app.MapPost("/api/satellite/upload", UploadUavTileBatch)
     .WithOpenApi(op => new(op)
     {
         Summary = "Upload a batch of UAV-captured satellite tiles",
-        Description = "AZ-488 / `uav-tile-upload.md` v1.0.0. Multipart form: a JSON `metadata` field and an aligned `files` collection. Each item is graded by the 5-rule quality gate and persisted with `source='uav'` when accepted. Returns 200 with per-item results (mixed accept/reject), 400 for envelope-level errors (malformed metadata, missing files, oversized batch), 401 without a valid JWT, 403 without the `GPS` permission claim."
+        Description = "Multipart form: a JSON `metadata` field and an aligned `files` collection. Each item is graded by the 5-rule quality gate and persisted with `source='uav'` when accepted. Returns 200 with per-item results (mixed accept/reject), 400 for envelope-level errors (malformed metadata, missing files, oversized batch), 401 without a valid JWT, 403 without the `GPS` permission claim."
     })
     .DisableAntiforgery();
 
@@ -225,7 +242,7 @@ app.MapPost("/api/satellite/request", RequestRegion)
     .WithOpenApi(op => new(op)
     {
         Summary = "Request tiles for a region",
-        Description = "Idempotent (AZ-362): POSTing the same `id` twice returns the existing region resource with HTTP 200 and does not enqueue duplicate background processing.",
+        Description = "Idempotent: POSTing the same `id` twice returns the existing region resource with HTTP 200 and does not enqueue duplicate background processing.",
     });
 
 app.MapGet("/api/satellite/region/{id:guid}", GetRegionStatus)
@@ -237,7 +254,7 @@ app.MapPost("/api/satellite/route", CreateRoute)
     .WithOpenApi(op => new(op)
     {
         Summary = "Create a route with intermediate points",
-        Description = "Idempotent (AZ-362): POSTing the same `id` twice returns the existing route resource with HTTP 200 and does not regenerate intermediate points or re-queue geofence regions.",
+        Description = "Idempotent: POSTing the same `id` twice returns the existing route resource with HTTP 200 and does not regenerate intermediate points or re-queue geofence regions.",
     });
 
 app.MapGet("/api/satellite/route/{id:guid}", GetRoute)
@@ -285,37 +302,10 @@ IResult GetSatelliteTilesByMgrs(string mgrs, double squareSideMeters)
 }
 
 async Task<IResult> GetTilesInventory(
-    [FromBody] TileInventoryRequest? request,
+    [FromBody] TileInventoryRequest request,
     HttpContext httpContext,
     ITileService tileService)
 {
-    if (request is null)
-    {
-        return Results.Problem(
-            statusCode: StatusCodes.Status400BadRequest,
-            title: "Invalid tile inventory request",
-            detail: "Request body is required.");
-    }
-
-    var tileCount = request.Tiles?.Count ?? 0;
-    var hashCount = request.LocationHashes?.Count ?? 0;
-    if ((tileCount == 0) == (hashCount == 0))
-    {
-        return Results.Problem(
-            statusCode: StatusCodes.Status400BadRequest,
-            title: "Invalid tile inventory request",
-            detail: "Populate exactly one of `tiles` or `locationHashes`. Sending both, or neither, is not allowed.");
-    }
-
-    var totalCount = Math.Max(tileCount, hashCount);
-    if (totalCount > TileInventoryLimits.MaxEntriesPerRequest)
-    {
-        return Results.Problem(
-            statusCode: StatusCodes.Status400BadRequest,
-            title: "Invalid tile inventory request",
-            detail: $"Inventory request capped at {TileInventoryLimits.MaxEntriesPerRequest} entries; got {totalCount}.");
-    }
-
     var response = await tileService.GetInventoryAsync(request, httpContext.RequestAborted);
     return Results.Ok(response);
 }

SatelliteProvider.Api/SatelliteProvider.Api.csproj

@@ -7,6 +7,8 @@
     </PropertyGroup>
 
     <ItemGroup>
+        <PackageReference Include="FluentValidation" Version="12.0.0" />
+        <PackageReference Include="FluentValidation.DependencyInjectionExtensions" Version="12.0.0" />
         <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="10.0.7" />
         <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="10.0.7"/>
         <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />

SatelliteProvider.Api/Validators/GlobalValidatorConfig.cs

@@ -0,0 +1,31 @@
+using FluentValidation;
+
+namespace SatelliteProvider.Api.Validators;
+
+// AZ-795 / AZ-796: process-wide FluentValidation configuration shared by the
+// API host and unit tests. Tests must call ApplyOnce() in their fixture setup
+// so the property-name casing they assert against matches what the running
+// API will produce — see `_docs/02_document/contracts/api/error-shape.md`
+// invariant Inv-4 (camelCase paths in `errors` map).
+public static class GlobalValidatorConfig
+{
+    private static readonly object _gate = new();
+    private static bool _applied;
+
+    public static void ApplyOnce()
+    {
+        lock (_gate)
+        {
+            if (_applied) return;
+
+            ValidatorOptions.Global.PropertyNameResolver = (type, member, expression) =>
+            {
+                var name = member?.Name;
+                if (string.IsNullOrEmpty(name)) return null;
+                return char.ToLowerInvariant(name[0]) + name[1..];
+            };
+
+            _applied = true;
+        }
+    }
+}

SatelliteProvider.Api/Validators/InventoryRequestValidator.cs

@@ -0,0 +1,73 @@
+using FluentValidation;
+using SatelliteProvider.Common.DTO;
+
+namespace SatelliteProvider.Api.Validators;
+
+// AZ-796: FluentValidation rules for POST /api/satellite/tiles/inventory.
+// Wired through ValidationEndpointFilter<TileInventoryRequest> at endpoint
+// registration time (`WithValidation<TileInventoryRequest>()` in Program.cs).
+// Failures are converted to RFC 7807 ValidationProblemDetails per
+// `_docs/02_document/contracts/api/error-shape.md` v1.0.0.
+//
+// Required-field detection (rules 5+) is partially handled at the deserializer
+// level via `[JsonRequired]` on TileCoord.Z/X/Y plus
+// `JsonSerializerOptions.UnmappedMemberHandling.Disallow` (AZ-795). This
+// validator covers the non-deserializer-detectable rules: XOR populated,
+// per-array entry caps, and slippy-map range constraints.
+public sealed class InventoryRequestValidator : AbstractValidator<TileInventoryRequest>
+{
+    public InventoryRequestValidator()
+    {
+        RuleFor(req => req).Custom((req, ctx) =>
+        {
+            var hasTiles = req.Tiles is { Count: > 0 };
+            var hasHashes = req.LocationHashes is { Count: > 0 };
+            if (hasTiles == hasHashes)
+            {
+                ctx.AddFailure(
+                    "$",
+                    "Populate exactly one of `tiles` or `locationHashes` (sending both, or neither, is not allowed).");
+            }
+        });
+
+        RuleFor(req => req.Tiles!.Count)
+            .LessThanOrEqualTo(TileInventoryLimits.MaxEntriesPerRequest)
+            .OverridePropertyName("tiles")
+            .WithMessage($"`tiles` must contain at most {TileInventoryLimits.MaxEntriesPerRequest} entries.")
+            .When(req => req.Tiles is not null);
+
+        RuleFor(req => req.LocationHashes!.Count)
+            .LessThanOrEqualTo(TileInventoryLimits.MaxEntriesPerRequest)
+            .OverridePropertyName("locationHashes")
+            .WithMessage($"`locationHashes` must contain at most {TileInventoryLimits.MaxEntriesPerRequest} entries.")
+            .When(req => req.LocationHashes is not null);
+
+        RuleForEach(req => req.Tiles)
+            .SetValidator(new TileCoordValidator())
+            .When(req => req.Tiles is not null);
+    }
+}
+
+internal sealed class TileCoordValidator : AbstractValidator<TileCoord>
+{
+    private const int MaxZoom = 22;
+
+    public TileCoordValidator()
+    {
+        RuleFor(c => c.Z)
+            .InclusiveBetween(0, MaxZoom)
+            .WithMessage($"`z` must be between 0 and {MaxZoom} (slippy-map zoom range).");
+
+        RuleFor(c => c.X)
+            .GreaterThanOrEqualTo(0)
+            .WithMessage("`x` must be ≥ 0.")
+            .Must((coord, x) => coord.Z >= 0 && coord.Z <= MaxZoom && x < (1L << coord.Z))
+            .WithMessage(coord => $"`x` must be < 2^z = {(coord.Z >= 0 && coord.Z <= MaxZoom ? (1L << coord.Z).ToString() : "<invalid z>")} for z={coord.Z}.");
+
+        RuleFor(c => c.Y)
+            .GreaterThanOrEqualTo(0)
+            .WithMessage("`y` must be ≥ 0.")
+            .Must((coord, y) => coord.Z >= 0 && coord.Z <= MaxZoom && y < (1L << coord.Z))
+            .WithMessage(coord => $"`y` must be < 2^z = {(coord.Z >= 0 && coord.Z <= MaxZoom ? (1L << coord.Z).ToString() : "<invalid z>")} for z={coord.Z}.");
+    }
+}

SatelliteProvider.Api/Validators/ValidationEndpointFilter.cs

@@ -0,0 +1,42 @@
+using FluentValidation;
+
+namespace SatelliteProvider.Api.Validators;
+
+// AZ-795: shared validation infrastructure. A generic IEndpointFilter that
+// resolves IValidator<T> from DI for the first argument of type T in the
+// invoked endpoint and returns RFC 7807 ValidationProblemDetails (HTTP 400)
+// with a structured `errors` map when the validator rejects. When validation
+// passes, the filter forwards to the next stage unchanged.
+//
+// The filter is generic per request type; per-endpoint wire-up is done via
+// `RouteHandlerBuilder.WithValidation<T>()` (see ValidationEndpointFilterExtensions).
+// Per AZ-795 Outcome: callers must NOT need per-endpoint try/catch boilerplate;
+// the filter provides the uniform error contract documented in
+// `_docs/02_document/contracts/api/error-shape.md`.
+public sealed class ValidationEndpointFilter<T> : IEndpointFilter where T : class
+{
+    public async ValueTask<object?> InvokeAsync(
+        EndpointFilterInvocationContext context,
+        EndpointFilterDelegate next)
+    {
+        var argument = context.Arguments.OfType<T>().FirstOrDefault();
+        if (argument is null)
+        {
+            return await next(context);
+        }
+
+        var validator = context.HttpContext.RequestServices.GetService<IValidator<T>>();
+        if (validator is null)
+        {
+            return await next(context);
+        }
+
+        var result = await validator.ValidateAsync(argument, context.HttpContext.RequestAborted);
+        if (!result.IsValid)
+        {
+            return Results.ValidationProblem(result.ToDictionary());
+        }
+
+        return await next(context);
+    }
+}

SatelliteProvider.Api/Validators/ValidationEndpointFilterExtensions.cs

@@ -0,0 +1,19 @@
+namespace SatelliteProvider.Api.Validators;
+
+// AZ-795: ergonomic extension method for opting an endpoint into
+// FluentValidation. Applied at MapPost/MapGet registration time:
+//
+//   app.MapPost("/api/satellite/tiles/inventory", GetTilesInventory)
+//      .WithValidation<TileInventoryRequest>();
+//
+// One line per endpoint; no per-handler try/catch boilerplate; uniform
+// RFC 7807 error shape — see `_docs/02_document/contracts/api/error-shape.md`.
+public static class ValidationEndpointFilterExtensions
+{
+    public static RouteHandlerBuilder WithValidation<T>(this RouteHandlerBuilder builder)
+        where T : class
+    {
+        builder.AddEndpointFilter<ValidationEndpointFilter<T>>();
+        return builder;
+    }
+}

SatelliteProvider.Api/appsettings.Development.json

@@ -8,7 +8,7 @@
     }
   },
   "ConnectionStrings": {
-    "DefaultConnection": "Host=localhost;Port=5432;Database=satelliteprovider;Username=postgres;Password=postgres"
+    "DefaultConnection": "Host=localhost;Port=5433;Database=satelliteprovider;Username=postgres;Password=postgres"
   },
   "Jwt": {
     "Secret": "DEV-ONLY-DO-NOT-USE-IN-PROD-replace-with-real-secret-via-JWT_SECRET-env-var",

SatelliteProvider.Common/DTO/TileInventory.cs

@@ -1,3 +1,5 @@
+using System.Text.Json.Serialization;
+
 namespace SatelliteProvider.Common.DTO;
 
 // AZ-505: bulk-list / inventory request envelope. Either `Tiles` OR
@@ -12,21 +14,33 @@ public sealed class TileInventoryRequest
     public IReadOnlyList<Guid>? LocationHashes { get; set; }
 }
 
-// AZ-505: Slippy-map tile coordinate triple. Field naming matches the on-wire
+// AZ-505: Slippy-map tile coordinate triple. AZ-794 (cycle 7) renamed the
-// snake_case used by the existing `GET /tiles/{z}/{x}/{y}` and the AZ-484/AZ-503
+// wire-format fields from `tileZoom/tileX/tileY` → `z/x/y` to align with the
-// `tiles` table columns (`tile_zoom`, `tile_x`, `tile_y`).
+// OSM / slippy-map convention already used by `GET /tiles/{z}/{x}/{y}` and
+// to shave wire-size on inventory requests carrying thousands of entries.
+// The C# property names (`Z`, `X`, `Y`) intentionally mirror the wire names
+// 1:1 so consumers don't need to mentally translate at the deserialization
+// boundary. The DataAccess `TileEntity.TileZoom/TileX/TileY` columns are
+// unchanged — that's a database identity, not a wire format.
 public sealed class TileCoord
 {
-    public int TileZoom { get; set; }
+    [JsonRequired]
-    public int TileX { get; set; }
+    public int Z { get; set; }
-    public int TileY { get; set; }
+
+    [JsonRequired]
+    public int X { get; set; }
+
+    [JsonRequired]
+    public int Y { get; set; }
 }
 
 // AZ-505: Inventory response. Entries are returned in the SAME ORDER as the
 // matching request input (per AC-1). When Request.Tiles was populated, each
-// entry's `TileZoom`/`TileX`/`TileY` echoes the request entry; when
+// entry's `Z`/`X`/`Y` echoes the request entry; when Request.LocationHashes
-// Request.LocationHashes was populated, the coord triple fields are 0 (the
+// was populated, the coord triple fields are 0 (the caller already knows
-// caller already knows the hash and can map it back themselves).
+// the hash and can map it back themselves). AZ-794 (cycle 7) renamed the
+// coord triple to `z/x/y` to align wire format with the URL-path
+// convention.
 public sealed class TileInventoryResponse
 {
     public IReadOnlyList<TileInventoryEntry> Results { get; set; } = Array.Empty<TileInventoryEntry>();
@@ -40,11 +54,14 @@ public sealed class TileInventoryResponse
 // `EstimatedBytes` is intentionally absent in v1.0.0 — adding the per-row
 // `stat()` cost is deferred until production profiling justifies it (see
 // AZ-505 Outcome bullet 1 + Excluded list).
+//
+// AZ-794 (cycle 7): coord triple renamed `tileZoom/tileX/tileY` → `z/x/y`
+// (contract bumped to v2.0.0).
 public sealed class TileInventoryEntry
 {
-    public int TileZoom { get; set; }
+    public int Z { get; set; }
-    public int TileX { get; set; }
+    public int X { get; set; }
-    public int TileY { get; set; }
+    public int Y { get; set; }
     public Guid LocationHash { get; set; }
     public bool Present { get; set; }
 

SatelliteProvider.IntegrationTests/IdempotentPostTests.cs

@@ -103,8 +103,8 @@ public static class IdempotentPostTests
             createTilesZip = false,
             points = new[]
             {
-                new { latitude = 47.4617, longitude = 37.6470 },
+                new { lat = 47.4617, lon = 37.6470 },
-                new { latitude = 47.4630, longitude = 37.6485 },
+                new { lat = 47.4630, lon = 37.6485 },
             },
         });
 

SatelliteProvider.IntegrationTests/ProblemDetailsAssertions.cs

@@ -0,0 +1,102 @@
+using System.Text.Json;
+
+namespace SatelliteProvider.IntegrationTests;
+
+// AZ-795: shared ProblemDetails / ValidationProblemDetails assertion helper
+// for integration tests. Every endpoint that emits a 4xx error MUST produce
+// a body matching the contract in
+// `_docs/02_document/contracts/api/error-shape.md` (v1.0.0). Tests use this
+// helper instead of re-deriving the shape per call site.
+public static class ProblemDetailsAssertions
+{
+    private static readonly JsonSerializerOptions JsonOptions = new()
+    {
+        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+        PropertyNameCaseInsensitive = true
+    };
+
+    public static async Task<JsonElement> ReadProblemDetailsAsync(HttpResponseMessage response, string label)
+    {
+        var contentType = response.Content.Headers.ContentType?.MediaType;
+        if (contentType is null || !contentType.Contains("application/problem+json", StringComparison.OrdinalIgnoreCase))
+        {
+            var body = await response.Content.ReadAsStringAsync();
+            throw new Exception(
+                $"{label}: expected Content-Type 'application/problem+json', got '{contentType}'. Body: {body}");
+        }
+
+        var stream = await response.Content.ReadAsStreamAsync();
+        using var doc = await JsonDocument.ParseAsync(stream);
+        return doc.RootElement.Clone();
+    }
+
+    public static void AssertValidationProblem(
+        JsonElement problem,
+        int expectedStatus,
+        string label,
+        string? expectedErrorPath = null,
+        string? expectedErrorContains = null)
+    {
+        if (!problem.TryGetProperty("status", out var statusEl) || statusEl.GetInt32() != expectedStatus)
+        {
+            throw new Exception(
+                $"{label}: expected status={expectedStatus}, got {(statusEl.ValueKind == JsonValueKind.Number ? statusEl.GetInt32().ToString() : "missing")}");
+        }
+
+        if (!problem.TryGetProperty("title", out var titleEl) || string.IsNullOrEmpty(titleEl.GetString()))
+        {
+            throw new Exception($"{label}: expected non-empty 'title', got missing/empty.");
+        }
+
+        if (!problem.TryGetProperty("errors", out var errorsEl) || errorsEl.ValueKind != JsonValueKind.Object)
+        {
+            throw new Exception($"{label}: expected 'errors' object, got {errorsEl.ValueKind}.");
+        }
+
+        if (expectedErrorPath is not null)
+        {
+            if (!errorsEl.TryGetProperty(expectedErrorPath, out var fieldEl) || fieldEl.ValueKind != JsonValueKind.Array)
+            {
+                throw new Exception(
+                    $"{label}: expected errors['{expectedErrorPath}'] array, got {(errorsEl.TryGetProperty(expectedErrorPath, out var raw) ? raw.ValueKind.ToString() : "missing")}. " +
+                    $"Available paths: {string.Join(", ", EnumeratePaths(errorsEl))}.");
+            }
+
+            if (expectedErrorContains is not null)
+            {
+                var first = fieldEl.EnumerateArray().FirstOrDefault();
+                var firstStr = first.ValueKind == JsonValueKind.String ? first.GetString() : null;
+                if (firstStr is null || !firstStr.Contains(expectedErrorContains, StringComparison.OrdinalIgnoreCase))
+                {
+                    throw new Exception(
+                        $"{label}: expected errors['{expectedErrorPath}'][0] to contain '{expectedErrorContains}', got '{firstStr}'.");
+                }
+            }
+        }
+    }
+
+    public static void AssertProblemDetails(
+        JsonElement problem,
+        int expectedStatus,
+        string label)
+    {
+        if (!problem.TryGetProperty("status", out var statusEl) || statusEl.GetInt32() != expectedStatus)
+        {
+            throw new Exception(
+                $"{label}: expected status={expectedStatus}, got {(statusEl.ValueKind == JsonValueKind.Number ? statusEl.GetInt32().ToString() : "missing")}");
+        }
+
+        if (!problem.TryGetProperty("title", out var titleEl) || string.IsNullOrEmpty(titleEl.GetString()))
+        {
+            throw new Exception($"{label}: expected non-empty 'title', got missing/empty.");
+        }
+    }
+
+    private static IEnumerable<string> EnumeratePaths(JsonElement errorsEl)
+    {
+        foreach (var prop in errorsEl.EnumerateObject())
+        {
+            yield return prop.Name;
+        }
+    }
+}

SatelliteProvider.IntegrationTests/Program.cs

@@ -139,6 +139,7 @@ class Program
         await StubAndErrorContractTests.RunAll(httpClient);
         await IdempotentPostTests.RunAll(httpClient);
         await TileInventoryTests.RunAll(httpClient);
+        await TileInventoryValidationTests.RunAll(httpClient);
         await LeafletPathIndexOnlyTests.RunAll(connectionString);
         await MigrationTests.RunAll();
     }
@@ -162,6 +163,7 @@ class Program
         await StubAndErrorContractTests.RunAll(httpClient);
         await IdempotentPostTests.RunAll(httpClient);
         await TileInventoryTests.RunAll(httpClient);
+        await TileInventoryValidationTests.RunAll(httpClient);
         await LeafletPathIndexOnlyTests.RunAll(connectionString);
         await MigrationTests.RunAll();
     }

SatelliteProvider.IntegrationTests/TileInventoryTests.cs

@@ -60,10 +60,10 @@ public static class TileInventoryTests
         var seed = (int)(DateTime.UtcNow.Ticks % int.MaxValue);
         var random = new Random(seed);
         var presentCoords = Enumerable.Range(0, 12)
-            .Select(i => new TileCoord { TileZoom = zoom, TileX = 600_000 + (seed % 1000) * 100 + i, TileY = 700_000 + (seed % 1000) * 100 + i })
+            .Select(i => new TileCoord { Z = zoom, X = 50_000 + (seed % 1000) * 100 + i, Y = 60_000 + (seed % 1000) * 100 + i })
             .ToArray();
         var absentCoords = Enumerable.Range(0, 13)
-            .Select(i => new TileCoord { TileZoom = zoom, TileX = 800_000 + (seed % 1000) * 100 + i, TileY = 900_000 + (seed % 1000) * 100 + i })
+            .Select(i => new TileCoord { Z = zoom, X = 80_000 + (seed % 1000) * 100 + i, Y = 100_000 + (seed % 1000) * 100 + i })
             .ToArray();
 
         // Pre-seed the present cells. Mix sources / flights to exercise the
@@ -74,7 +74,7 @@ public static class TileInventoryTests
         for (var i = 0; i < presentCoords.Length; i++)
         {
             var coord = presentCoords[i];
-            var locationHash = Uuidv5.LocationHashForTile(coord.TileZoom, coord.TileX, coord.TileY);
+            var locationHash = Uuidv5.LocationHashForTile(coord.Z, coord.X, coord.Y);
 
             // Seed at least one google_maps row for every present cell.
             var googleId = Guid.NewGuid();
@@ -119,7 +119,7 @@ public static class TileInventoryTests
         }
 
         var presentHashes = presentCoords
-            .Select(c => Uuidv5.LocationHashForTile(c.TileZoom, c.TileX, c.TileY))
+            .Select(c => Uuidv5.LocationHashForTile(c.Z, c.X, c.Y))
             .ToHashSet();
 
         for (var i = 0; i < allCoords.Length; i++)
@@ -127,14 +127,14 @@ public static class TileInventoryTests
             var requestedCoord = allCoords[i];
             var entry = body.Results[i];
 
-            if (entry.TileZoom != requestedCoord.TileZoom || entry.TileX != requestedCoord.TileX || entry.TileY != requestedCoord.TileY)
+            if (entry.Z != requestedCoord.Z || entry.X != requestedCoord.X || entry.Y != requestedCoord.Y)
             {
                 throw new Exception(
-                    $"AC-1: entry {i} coords mismatch — request was ({requestedCoord.TileZoom},{requestedCoord.TileX},{requestedCoord.TileY}), " +
+                    $"AC-1: entry {i} coords mismatch — request was ({requestedCoord.Z},{requestedCoord.X},{requestedCoord.Y}), " +
-                    $"response is ({entry.TileZoom},{entry.TileX},{entry.TileY})");
+                    $"response is ({entry.Z},{entry.X},{entry.Y})");
             }
 
-            var expectedHash = Uuidv5.LocationHashForTile(requestedCoord.TileZoom, requestedCoord.TileX, requestedCoord.TileY);
+            var expectedHash = Uuidv5.LocationHashForTile(requestedCoord.Z, requestedCoord.X, requestedCoord.Y);
             if (entry.LocationHash != expectedHash)
             {
                 throw new Exception($"AC-1: entry {i} location_hash mismatch — expected {expectedHash}, got {entry.LocationHash}");
@@ -195,11 +195,11 @@ public static class TileInventoryTests
         var seed = (int)(DateTime.UtcNow.Ticks % int.MaxValue);
         var coord = new TileCoord
         {
-            TileZoom = zoom,
+            Z = zoom,
-            TileX = 1_200_000 + (seed % 1000),
+            X = 130_000 + (seed % 1000),
-            TileY = 1_300_000 + (seed % 1000)
+            Y = 150_000 + (seed % 1000)
         };
-        var locationHash = Uuidv5.LocationHashForTile(coord.TileZoom, coord.TileX, coord.TileY);
+        var locationHash = Uuidv5.LocationHashForTile(coord.Z, coord.X, coord.Y);
 
         var googleId = Guid.NewGuid();
         var googleCapturedAt = DateTime.UtcNow.AddHours(-2);
@@ -252,7 +252,7 @@ public static class TileInventoryTests
         // Arrange
         var request = new TileInventoryRequest
         {
-            Tiles = new[] { new TileCoord { TileZoom = 18, TileX = 1, TileY = 1 } },
+            Tiles = new[] { new TileCoord { Z = 18, X = 1, Y = 1 } },
             LocationHashes = new[] { Guid.NewGuid() }
         };
 
@@ -309,7 +309,7 @@ public static class TileInventoryTests
         using var anonymous = new HttpClient { BaseAddress = baseAddress, Timeout = TimeSpan.FromSeconds(30) };
         var request = new TileInventoryRequest
         {
-            Tiles = new[] { new TileCoord { TileZoom = 18, TileX = 1, TileY = 1 } }
+            Tiles = new[] { new TileCoord { Z = 18, X = 1, Y = 1 } }
         };
 
         // Act
@@ -361,7 +361,7 @@ public static class TileInventoryTests
             {
                 var x = 100_000 + random.Next(0, 65_536);
                 var y = 100_000 + random.Next(0, 65_536);
-                coords[i] = new TileCoord { TileZoom = zoom, TileX = x, TileY = y };
+                coords[i] = new TileCoord { Z = zoom, X = x, Y = y };
                 var hash = Uuidv5.LocationHashForTile(zoom, x, y);
                 idP.Value = Guid.NewGuid();
                 zP.Value = zoom;
@@ -429,12 +429,12 @@ public static class TileInventoryTests
             VALUES (@id, @z, @x, @y, @lat, @lon, 200.0, 256, 'jpg', @fp, @src, @t, @t, @t, @flight, @loc)
             ON CONFLICT DO NOTHING;", conn);
         cmd.Parameters.AddWithValue("id", id);
-        cmd.Parameters.AddWithValue("z", coord.TileZoom);
+        cmd.Parameters.AddWithValue("z", coord.Z);
-        cmd.Parameters.AddWithValue("x", coord.TileX);
+        cmd.Parameters.AddWithValue("x", coord.X);
-        cmd.Parameters.AddWithValue("y", coord.TileY);
+        cmd.Parameters.AddWithValue("y", coord.Y);
-        cmd.Parameters.AddWithValue("lat", 60.0 + coord.TileX * 1e-9);
+        cmd.Parameters.AddWithValue("lat", 60.0 + coord.X * 1e-9);
-        cmd.Parameters.AddWithValue("lon", 30.0 + coord.TileY * 1e-9);
+        cmd.Parameters.AddWithValue("lon", 30.0 + coord.Y * 1e-9);
-        cmd.Parameters.AddWithValue("fp", $"tiles/seed/{coord.TileZoom}/{coord.TileX}/{coord.TileY}.jpg");
+        cmd.Parameters.AddWithValue("fp", $"tiles/seed/{coord.Z}/{coord.X}/{coord.Y}.jpg");
         cmd.Parameters.AddWithValue("src", source);
         // schema column is TIMESTAMP (no tz); Npgsql v6+ refuses to bind a
         // Kind=Utc DateTime into a plain timestamp column. Callers pass UTC

SatelliteProvider.IntegrationTests/TileInventoryValidationTests.cs

@@ -0,0 +1,430 @@
+using System.Net;
+using System.Net.Http.Json;
+using System.Text;
+using System.Text.Json;
+
+namespace SatelliteProvider.IntegrationTests;
+
+// AZ-796: end-to-end coverage for the inventory endpoint's strict input
+// validation. Each test exercises one rule from the validator (FluentValidation
+// for business rules, JsonSerializerOptions for wire-format rules) and asserts
+// the response body conforms to the RFC 7807 ValidationProblemDetails contract
+// in `_docs/02_document/contracts/api/error-shape.md` v1.0.0.
+public static class TileInventoryValidationTests
+{
+    private const string InventoryPath = "/api/satellite/tiles/inventory";
+
+    public static async Task RunAll(HttpClient httpClient)
+    {
+        RouteTestHelpers.PrintTestHeader("Test: Inventory endpoint strict validation (AZ-796)");
+
+        await HappyPath_Returns200(httpClient);
+
+        // Rule 1: body present
+        await EmptyBody_Returns400(httpClient);
+        // Rule 2: tiles required (one of tiles/locationHashes must be populated)
+        await NeitherPopulated_Returns400(httpClient);
+        await BothPopulated_Returns400(httpClient);
+        // Rule 3: tiles non-empty
+        await EmptyTilesArray_Returns400(httpClient);
+        // Rule 4: tiles max size
+        await TilesOverCap_Returns400(httpClient);
+        // Rule 5: each entry has z, x, y
+        await MissingZ_Returns400WithFieldPath(httpClient);
+        await MissingXAndY_Returns400(httpClient);
+        // Rule 6: non-negative integer fields
+        await NegativeAxis_Returns400(httpClient);
+        await TypeMismatch_Returns400(httpClient);
+        // Rule 7: z within supported zoom range
+        await ZoomOutOfRange_Returns400WithFieldPath(httpClient);
+        // Rule 8: x / y within tile-axis bounds
+        await XBeyondZoomBounds_Returns400(httpClient);
+        await YBeyondZoomBounds_Returns400(httpClient);
+        // Rule 9: unknown fields rejected
+        await UnknownRootField_Returns400(httpClient);
+        await UnknownNestedField_Returns400(httpClient);
+        await OldV1FieldName_Returns400(httpClient);
+
+        Console.WriteLine("✓ Inventory validation tests: PASSED");
+    }
+
+    private static async Task HappyPath_Returns200(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-796: well-formed request with z/x/y triple → HTTP 200");
+
+        // Arrange
+        const string body = """{"tiles":[{"z":18,"x":1,"y":1}]}""";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+
+        // Assert
+        if (response.StatusCode != HttpStatusCode.OK)
+        {
+            var errorBody = await response.Content.ReadAsStringAsync();
+            throw new Exception($"AZ-796 happy path: expected 200, got {(int)response.StatusCode}. Body: {errorBody}");
+        }
+
+        Console.WriteLine("  ✓ Valid {z, x, y} request returns HTTP 200");
+    }
+
+    private static async Task EmptyBody_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-796 rule 1: empty body → HTTP 400");
+
+        // Arrange — POST with zero-byte body and JSON content type. The framework
+        // rejects the missing required body parameter before any handler/filter
+        // runs, so the response is basic RFC 7807 ProblemDetails with no `errors`
+        // map (vs. ValidationProblemDetails on field-level violations).
+        var content = new StringContent(string.Empty, Encoding.UTF8, "application/json");
+
+        // Act
+        var response = await httpClient.PostAsync(InventoryPath, content);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-796 empty body");
+
+        // Assert
+        ProblemDetailsAssertions.AssertProblemDetails(problem, expectedStatus: 400, label: "AZ-796 empty body");
+
+        Console.WriteLine("  ✓ Empty body rejected with HTTP 400 + ProblemDetails");
+    }
+
+    private static async Task NeitherPopulated_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-796 rule 2: neither tiles nor locationHashes populated → HTTP 400");
+
+        // Arrange
+        const string body = """{}""";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-796 neither populated");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(
+            problem,
+            expectedStatus: 400,
+            label: "AZ-796 neither populated",
+            expectedErrorPath: "$");
+
+        Console.WriteLine("  ✓ Empty object rejected with errors[\"$\"] (XOR rule)");
+    }
+
+    private static async Task BothPopulated_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-796 rule 2: both tiles and locationHashes populated → HTTP 400");
+
+        // Arrange
+        const string body = """{"tiles":[{"z":18,"x":1,"y":1}],"locationHashes":["00000000-0000-0000-0000-000000000000"]}""";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-796 both populated");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(
+            problem,
+            expectedStatus: 400,
+            label: "AZ-796 both populated",
+            expectedErrorPath: "$");
+
+        Console.WriteLine("  ✓ Both populated rejected with errors[\"$\"] (XOR rule)");
+    }
+
+    private static async Task EmptyTilesArray_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-796 rule 3: empty tiles array → HTTP 400");
+
+        // Arrange — XOR rule treats empty arrays as not-populated
+        const string body = """{"tiles":[]}""";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-796 empty tiles array");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(
+            problem,
+            expectedStatus: 400,
+            label: "AZ-796 empty tiles array",
+            expectedErrorPath: "$");
+
+        Console.WriteLine("  ✓ Empty tiles array rejected with HTTP 400");
+    }
+
+    private static async Task TilesOverCap_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-796 rule 4: > 5000 tile entries → HTTP 400");
+
+        // Arrange — TileInventoryLimits.MaxEntriesPerRequest is 5000
+        var sb = new StringBuilder();
+        sb.Append("""{"tiles":[""");
+        for (var i = 0; i < 5001; i++)
+        {
+            if (i > 0) sb.Append(',');
+            sb.Append("""{"z":18,"x":1,"y":1}""");
+        }
+        sb.Append("]}");
+
+        // Act
+        var response = await PostJsonAsync(httpClient, sb.ToString());
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-796 over cap");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(
+            problem,
+            expectedStatus: 400,
+            label: "AZ-796 over cap",
+            expectedErrorPath: "tiles");
+
+        Console.WriteLine("  ✓ 5001-entry tiles array rejected with errors[\"tiles\"]");
+    }
+
+    private static async Task MissingZ_Returns400WithFieldPath(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-796: missing `z` → HTTP 400 with structured errors map");
+
+        // Arrange — JsonRequired on TileCoord.Z catches this at the deserializer layer.
+        const string body = """{"tiles":[{"x":1,"y":1}]}""";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-796 missing z");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-796 missing z");
+        AssertErrorsContainsMention(problem, expectedMention: "z", label: "AZ-796 missing z");
+
+        Console.WriteLine("  ✓ Missing `z` rejected with errors map mentioning the field");
+    }
+
+    private static async Task MissingXAndY_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-796: missing `x` and `y` → HTTP 400");
+
+        // Arrange
+        const string body = """{"tiles":[{"z":18}]}""";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-796 missing x/y");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-796 missing x/y");
+
+        Console.WriteLine("  ✓ Missing `x` and `y` rejected with HTTP 400");
+    }
+
+    private static async Task ZoomOutOfRange_Returns400WithFieldPath(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-796: z out of slippy-map range → HTTP 400 with errors[\"tiles[0].z\"]");
+
+        // Arrange — z=30 is beyond the supported max of 22
+        const string body = """{"tiles":[{"z":30,"x":0,"y":0}]}""";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-796 z=30");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(
+            problem,
+            expectedStatus: 400,
+            label: "AZ-796 z=30",
+            expectedErrorPath: "tiles[0].z",
+            expectedErrorContains: "between 0 and 22");
+
+        Console.WriteLine("  ✓ z=30 rejected with errors[\"tiles[0].z\"] mentioning range");
+    }
+
+    private static async Task XBeyondZoomBounds_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-796: x ≥ 2^z → HTTP 400");
+
+        // Arrange — at z=2, valid x is 0..3; x=4 is invalid
+        const string body = """{"tiles":[{"z":2,"x":4,"y":0}]}""";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-796 x=4 z=2");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(
+            problem,
+            expectedStatus: 400,
+            label: "AZ-796 x=4 z=2",
+            expectedErrorPath: "tiles[0].x");
+
+        Console.WriteLine("  ✓ x=4 at z=2 rejected with errors[\"tiles[0].x\"]");
+    }
+
+    private static async Task YBeyondZoomBounds_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-796: y ≥ 2^z → HTTP 400");
+
+        // Arrange — at z=0, valid y is 0..0; y=1 is invalid
+        const string body = """{"tiles":[{"z":0,"x":0,"y":1}]}""";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-796 y=1 z=0");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(
+            problem,
+            expectedStatus: 400,
+            label: "AZ-796 y=1 z=0",
+            expectedErrorPath: "tiles[0].y");
+
+        Console.WriteLine("  ✓ y=1 at z=0 rejected with errors[\"tiles[0].y\"]");
+    }
+
+    private static async Task NegativeAxis_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-796: negative coordinate → HTTP 400");
+
+        // Arrange
+        const string body = """{"tiles":[{"z":18,"x":-1,"y":0}]}""";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-796 x=-1");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(
+            problem,
+            expectedStatus: 400,
+            label: "AZ-796 x=-1",
+            expectedErrorPath: "tiles[0].x");
+
+        Console.WriteLine("  ✓ x=-1 rejected with errors[\"tiles[0].x\"]");
+    }
+
+    private static async Task UnknownRootField_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-796: unknown root field → HTTP 400 (UnmappedMemberHandling.Disallow)");
+
+        // Arrange
+        const string body = """{"unknownField":42,"tiles":[{"z":18,"x":1,"y":1}]}""";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-796 unknown root field");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-796 unknown root field");
+        AssertErrorsContainsMention(problem, expectedMention: "unknownField", label: "AZ-796 unknown root field");
+
+        Console.WriteLine("  ✓ Unknown root field rejected; errors map names the field");
+    }
+
+    private static async Task UnknownNestedField_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-796: unknown nested field on tile entry → HTTP 400");
+
+        // Arrange
+        const string body = """{"tiles":[{"z":18,"x":1,"y":1,"foo":42}]}""";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-796 unknown nested field");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-796 unknown nested field");
+        AssertErrorsContainsMention(problem, expectedMention: "foo", label: "AZ-796 unknown nested field");
+
+        Console.WriteLine("  ✓ Unknown nested field rejected; errors map names the field");
+    }
+
+    private static async Task OldV1FieldName_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-794 + AZ-796: legacy `tileZoom`/`tileX`/`tileY` field name → HTTP 400");
+
+        // Arrange — exact AZ-777 Phase 1 reproduction; v1 callers must now fail explicitly
+        // instead of silently coercing to (0,0,0).
+        const string body = """{"tiles":[{"tileZoom":18,"tileX":1,"tileY":1}]}""";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-794 legacy field");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-794 legacy field");
+        AssertErrorsContainsMention(problem, expectedMention: "tileZoom", label: "AZ-794 legacy field");
+
+        Console.WriteLine("  ✓ Legacy v1.x field names rejected with explicit error (no silent coercion)");
+    }
+
+    private static async Task TypeMismatch_Returns400(HttpClient httpClient)
+    {
+        Console.WriteLine();
+        Console.WriteLine("AZ-796: type mismatch (string where integer expected) → HTTP 400");
+
+        // Arrange
+        const string body = """{"tiles":[{"z":"eighteen","x":1,"y":1}]}""";
+
+        // Act
+        var response = await PostJsonAsync(httpClient, body);
+        var problem = await ProblemDetailsAssertions.ReadProblemDetailsAsync(response, "AZ-796 type mismatch");
+
+        // Assert
+        ProblemDetailsAssertions.AssertValidationProblem(problem, expectedStatus: 400, label: "AZ-796 type mismatch");
+
+        Console.WriteLine("  ✓ String-where-int rejected with HTTP 400");
+    }
+
+    private static Task<HttpResponseMessage> PostJsonAsync(HttpClient httpClient, string body)
+    {
+        var content = new StringContent(body, Encoding.UTF8, "application/json");
+        return httpClient.PostAsync(InventoryPath, content);
+    }
+
+    private static void AssertErrorsContainsMention(JsonElement problem, string expectedMention, string label)
+    {
+        if (!problem.TryGetProperty("errors", out var errorsEl) || errorsEl.ValueKind != JsonValueKind.Object)
+        {
+            throw new Exception($"{label}: expected 'errors' object in ProblemDetails body.");
+        }
+
+        var found = false;
+        foreach (var prop in errorsEl.EnumerateObject())
+        {
+            if (prop.Name.Contains(expectedMention, StringComparison.OrdinalIgnoreCase))
+            {
+                found = true;
+                break;
+            }
+
+            foreach (var msg in prop.Value.EnumerateArray())
+            {
+                if (msg.GetString()?.Contains(expectedMention, StringComparison.OrdinalIgnoreCase) == true)
+                {
+                    found = true;
+                    break;
+                }
+            }
+
+            if (found) break;
+        }
+
+        if (!found)
+        {
+            var paths = string.Join(", ", errorsEl.EnumerateObject().Select(p => p.Name));
+            throw new Exception($"{label}: expected '{expectedMention}' to appear in errors keys or messages. Available paths: {paths}.");
+        }
+    }
+}

SatelliteProvider.Services.TileDownloader/TileService.cs

@@ -173,8 +173,8 @@ public class TileService : ITileService
         {
             foreach (var coord in tiles!)
             {
-                var hash = Uuidv5.LocationHashForTile(coord.TileZoom, coord.TileX, coord.TileY);
+                var hash = Uuidv5.LocationHashForTile(coord.Z, coord.X, coord.Y);
-                entries.Add((coord.TileZoom, coord.TileX, coord.TileY, hash));
+                entries.Add((coord.Z, coord.X, coord.Y, hash));
             }
         }
         else
@@ -195,9 +195,9 @@ public class TileService : ITileService
             {
                 results.Add(new TileInventoryEntry
                 {
-                    TileZoom = hasTiles ? zoom : tile.TileZoom,
+                    Z = hasTiles ? zoom : tile.TileZoom,
-                    TileX = hasTiles ? x : tile.TileX,
+                    X = hasTiles ? x : tile.TileX,
-                    TileY = hasTiles ? y : tile.TileY,
+                    Y = hasTiles ? y : tile.TileY,
                     LocationHash = hash,
                     Present = true,
                     Id = tile.Id,
@@ -211,9 +211,9 @@ public class TileService : ITileService
             {
                 results.Add(new TileInventoryEntry
                 {
-                    TileZoom = zoom,
+                    Z = zoom,
-                    TileX = x,
+                    X = x,
-                    TileY = y,
+                    Y = y,
                     LocationHash = hash,
                     Present = false
                 });

SatelliteProvider.Tests/GlobalExceptionHandlerTests.cs

@@ -72,6 +72,45 @@ public class GlobalExceptionHandlerTests
             "BadHttpRequestException is a client error and must not be ERROR-logged as a server failure");
     }
 
+    [Fact]
+    public async Task TryHandleAsync_DeserializationFailure_WritesValidationProblemDetailsWithJsonPath_AZ795()
+    {
+        // Arrange
+        var loggerMock = new Mock<ILogger<GlobalExceptionHandler>>();
+        var handler = new GlobalExceptionHandler(loggerMock.Object);
+        var httpContext = new DefaultHttpContext { TraceIdentifier = "trace-AZ795" };
+        httpContext.Response.Body = new MemoryStream();
+        var jsonInner = new JsonException(
+            "The JSON property 'foo' could not be mapped to any .NET member contained in type 'TileInventoryRequest'.",
+            "$.tiles[0].foo",
+            lineNumber: null,
+            bytePositionInLine: null);
+        var bindFailure = new BadHttpRequestException(
+            "Failed to read parameter \"TileInventoryRequest request\" from request body.",
+            StatusCodes.Status400BadRequest,
+            jsonInner);
+
+        // Act
+        var handled = await handler.TryHandleAsync(httpContext, bindFailure, CancellationToken.None);
+
+        // Assert
+        handled.Should().BeTrue();
+        httpContext.Response.StatusCode.Should().Be(StatusCodes.Status400BadRequest);
+        httpContext.Response.ContentType.Should().Contain("application/problem+json");
+
+        httpContext.Response.Body.Position = 0;
+        using var doc = JsonDocument.Parse(httpContext.Response.Body);
+        var root = doc.RootElement;
+
+        root.GetProperty("status").GetInt32().Should().Be(400);
+        root.GetProperty("title").GetString().Should().Be("One or more validation errors occurred.");
+        root.GetProperty("type").GetString().Should().Be("https://tools.ietf.org/html/rfc7231#section-6.5.1");
+        root.GetProperty("errors")
+            .GetProperty("tiles[0].foo")[0]
+            .GetString()
+            .Should().Contain("could not be mapped");
+    }
+
     [Fact]
     public async Task TryHandleAsync_LogsFullExceptionWithCorrelationId_AC2()
     {

SatelliteProvider.Tests/TestSupport/ValidatorTestModuleInitializer.cs

@@ -0,0 +1,16 @@
+using System.Runtime.CompilerServices;
+using SatelliteProvider.Api.Validators;
+
+namespace SatelliteProvider.Tests.TestSupport;
+
+internal static class ValidatorTestModuleInitializer
+{
+    // ModuleInitializer (.NET 5+) runs once per assembly load. We piggy-back the
+    // production GlobalValidatorConfig.ApplyOnce() so unit tests assert against
+    // the same FluentValidation property-name casing the live API produces.
+    [ModuleInitializer]
+    public static void Initialize()
+    {
+        GlobalValidatorConfig.ApplyOnce();
+    }
+}

SatelliteProvider.Tests/Validators/InventoryRequestValidatorTests.cs

@@ -0,0 +1,261 @@
+using FluentAssertions;
+using FluentValidation.TestHelper;
+using SatelliteProvider.Api.Validators;
+using SatelliteProvider.Common.DTO;
+
+namespace SatelliteProvider.Tests.Validators;
+
+public class InventoryRequestValidatorTests
+{
+    private readonly InventoryRequestValidator _validator = new();
+
+    [Fact]
+    public void Validate_TilesPopulated_LocationHashesNull_Passes()
+    {
+        // Arrange
+        var request = new TileInventoryRequest
+        {
+            Tiles = new[] { new TileCoord { Z = 18, X = 1, Y = 1 } }
+        };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldNotHaveAnyValidationErrors();
+    }
+
+    [Fact]
+    public void Validate_LocationHashesPopulated_TilesNull_Passes()
+    {
+        // Arrange
+        var request = new TileInventoryRequest
+        {
+            LocationHashes = new[] { Guid.NewGuid() }
+        };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldNotHaveAnyValidationErrors();
+    }
+
+    [Fact]
+    public void Validate_BothPopulated_FailsXorRule()
+    {
+        // Arrange
+        var request = new TileInventoryRequest
+        {
+            Tiles = new[] { new TileCoord { Z = 18, X = 1, Y = 1 } },
+            LocationHashes = new[] { Guid.NewGuid() }
+        };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("$")
+            .WithErrorMessage("Populate exactly one of `tiles` or `locationHashes` (sending both, or neither, is not allowed).");
+    }
+
+    [Fact]
+    public void Validate_NeitherPopulated_FailsXorRule()
+    {
+        // Arrange
+        var request = new TileInventoryRequest();
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("$");
+    }
+
+    [Fact]
+    public void Validate_BothEmpty_FailsXorRule()
+    {
+        // Arrange
+        var request = new TileInventoryRequest
+        {
+            Tiles = Array.Empty<TileCoord>(),
+            LocationHashes = Array.Empty<Guid>()
+        };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("$");
+    }
+
+    [Fact]
+    public void Validate_TilesAtCap_Passes()
+    {
+        // Arrange
+        var coords = Enumerable.Range(0, TileInventoryLimits.MaxEntriesPerRequest)
+            .Select(_ => new TileCoord { Z = 18, X = 1, Y = 1 })
+            .ToArray();
+        var request = new TileInventoryRequest { Tiles = coords };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldNotHaveValidationErrorFor("tiles");
+    }
+
+    [Fact]
+    public void Validate_TilesOverCap_FailsCapRule()
+    {
+        // Arrange
+        var coords = Enumerable.Range(0, TileInventoryLimits.MaxEntriesPerRequest + 1)
+            .Select(_ => new TileCoord { Z = 18, X = 1, Y = 1 })
+            .ToArray();
+        var request = new TileInventoryRequest { Tiles = coords };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("tiles")
+            .WithErrorMessage($"`tiles` must contain at most {TileInventoryLimits.MaxEntriesPerRequest} entries.");
+    }
+
+    [Fact]
+    public void Validate_LocationHashesOverCap_FailsCapRule()
+    {
+        // Arrange
+        var hashes = Enumerable.Range(0, TileInventoryLimits.MaxEntriesPerRequest + 1)
+            .Select(_ => Guid.NewGuid())
+            .ToArray();
+        var request = new TileInventoryRequest { LocationHashes = hashes };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("locationHashes")
+            .WithErrorMessage($"`locationHashes` must contain at most {TileInventoryLimits.MaxEntriesPerRequest} entries.");
+    }
+
+    [Theory]
+    [InlineData(-1)]
+    [InlineData(23)]
+    [InlineData(100)]
+    public void Validate_TileZoomOutOfRange_FailsRangeRule(int z)
+    {
+        // Arrange
+        var request = new TileInventoryRequest
+        {
+            Tiles = new[] { new TileCoord { Z = z, X = 0, Y = 0 } }
+        };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("tiles[0].z");
+    }
+
+    [Theory]
+    [InlineData(0)]
+    [InlineData(18)]
+    [InlineData(22)]
+    public void Validate_TileZoomInRange_PassesRangeRule(int z)
+    {
+        // Arrange
+        var maxAxis = (1 << z) - 1;
+        var request = new TileInventoryRequest
+        {
+            Tiles = new[] { new TileCoord { Z = z, X = maxAxis, Y = maxAxis } }
+        };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldNotHaveValidationErrorFor("tiles[0].z");
+    }
+
+    [Fact]
+    public void Validate_TileXNegative_FailsRangeRule()
+    {
+        // Arrange
+        var request = new TileInventoryRequest
+        {
+            Tiles = new[] { new TileCoord { Z = 18, X = -1, Y = 0 } }
+        };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("tiles[0].x");
+    }
+
+    [Fact]
+    public void Validate_TileXAtUpperBound_FailsRangeRule()
+    {
+        // Arrange — at z=2, valid x is 0..3, so x=4 is invalid
+        var request = new TileInventoryRequest
+        {
+            Tiles = new[] { new TileCoord { Z = 2, X = 4, Y = 0 } }
+        };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("tiles[0].x")
+            .WithErrorMessage("`x` must be < 2^z = 4 for z=2.");
+    }
+
+    [Fact]
+    public void Validate_TileYNegative_FailsRangeRule()
+    {
+        // Arrange
+        var request = new TileInventoryRequest
+        {
+            Tiles = new[] { new TileCoord { Z = 18, X = 0, Y = -1 } }
+        };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("tiles[0].y");
+    }
+
+    [Fact]
+    public void Validate_TileYAtUpperBound_FailsRangeRule()
+    {
+        // Arrange — at z=0, valid y is 0..0, so y=1 is invalid
+        var request = new TileInventoryRequest
+        {
+            Tiles = new[] { new TileCoord { Z = 0, X = 0, Y = 1 } }
+        };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldHaveValidationErrorFor("tiles[0].y");
+    }
+
+    [Fact]
+    public void Validate_AxesAtMaxForZoom_Passes()
+    {
+        // Arrange — at z=18, valid x/y is 0..(2^18 - 1) = 0..262143
+        var request = new TileInventoryRequest
+        {
+            Tiles = new[] { new TileCoord { Z = 18, X = 262_143, Y = 262_143 } }
+        };
+
+        // Act
+        var result = _validator.TestValidate(request);
+
+        // Assert
+        result.ShouldNotHaveAnyValidationErrors();
+    }
+}

_docs/02_document/architecture.md

@@ -88,7 +88,7 @@ The N-source storage contract is authoritative in `_docs/02_document/contracts/d
 
 | Config | Development | Production |
 |--------|-------------|------------|
-| Database | localhost:5432 (Docker) | Container network `db:5432` |
+| Database | localhost:5433 (Docker) | Container network `db:5432` |
 | Secrets | appsettings.Development.json | Environment variables |
 | Logging | Console + File | File (./logs/) |
 | API URL | http://localhost:5100 | http://0.0.0.0:5100 |
@@ -200,3 +200,28 @@ The authoritative source/flight markers are the `tiles.source` and `tiles.flight
 **Decision**: Use `IHostedService` implementations that consume from the in-process queue.
 
 **Consequences**: Clean separation of request handling and processing; lifecycle managed by the host.
+
+## 9. Input Validation (AZ-795)
+
+Every public HTTP endpoint MUST reject malformed or out-of-range payloads with HTTP 400 + RFC 7807 `ValidationProblemDetails`. The shared infrastructure landed in AZ-795 (cycle 7) is two collaborating layers:
+
+1. **Deserializer-level rejection** — `JsonSerializerOptions.UnmappedMemberHandling.Disallow` configured in `Program.cs` (`ConfigureHttpJsonOptions`) catches unknown fields, type mismatches, and malformed JSON. The framework wraps the resulting `JsonException` in `BadHttpRequestException`; `GlobalExceptionHandler` extracts the JSON path and emits a structured `ValidationProblemDetails` body.
+2. **Business-rule rejection** — `FluentValidation` 12.0.0 validators registered via `AddValidatorsFromAssemblyContaining<Program>()` and wired through the generic `ValidationEndpointFilter<T>` (`SatelliteProvider.Api/Validators/ValidationEndpointFilter.cs`). Endpoints opt in via `RouteHandlerBuilder.WithValidation<T>()`; the filter calls `Results.ValidationProblem(result.ToDictionary())` on failure.
+
+Both layers produce the wire shape documented in `_docs/02_document/contracts/api/error-shape.md` (v1.0.0).
+
+### Validator coverage
+
+| Endpoint | Request DTO | Validator | Status | Owning task |
+|----------|-------------|-----------|--------|-------------|
+| `POST /api/satellite/tiles/inventory` | `TileInventoryRequest` | `InventoryRequestValidator` | covered | AZ-796 (cycle 7) |
+| `GET /tiles/{z}/{x}/{y}` | route params | (route-constraint only — `:int` covers types; AZ-795 deserializer guards body shape on POST endpoints only) | covered by route-constraint | AZ-487 (cycle 1, JWT gate) |
+| `GET /api/satellite/tiles/latlon` | query params | (query-binding type checks via `[FromQuery]`; future AZ-795 child task to add explicit FluentValidation) | partial | future AZ-795 child |
+| `POST /api/satellite/upload` | `UavTileBatchUploadRequest` (multipart) | (envelope-level validation in `UavTileUploadHandler`; future AZ-795 child to formalize as FluentValidation) | partial | future AZ-795 child |
+| `POST /api/satellite/request` | `RequestRegionRequest` | (inline `SizeMeters` range check; future AZ-795 child) | partial | future AZ-795 child |
+| `POST /api/satellite/route` | `CreateRouteRequest` | (typed `ArgumentException` path → 400; future AZ-795 child) | partial | future AZ-795 child |
+| `GET /api/satellite/region/{id:guid}` | route param | (route-constraint `:guid`) | covered by route-constraint | — |
+| `GET /api/satellite/route/{id:guid}` | route param | (route-constraint `:guid`) | covered by route-constraint | — |
+| `GET /api/satellite/tiles/mgrs` | (stub) | n/a — returns 501 | n/a | AZ-356 |
+
+The `partial` rows are tracked under the AZ-795 epic; per-endpoint child tickets to be filed by parent-suite team after enumerating the surface from the OpenAPI spec.

_docs/02_document/contracts/api/error-shape.md

@@ -0,0 +1,136 @@
+# Contract: error-shape
+
+**Component**: WebApi (`SatelliteProvider.Api`) — applies to every public HTTP endpoint
+**Producer task**: AZ-795 — `_docs/02_tasks/done/AZ-795_strict_validation_epic.md`
+**Consumer tasks**: every per-endpoint child of AZ-795 (first: AZ-796) plus every `gps-denied-onboard` HTTP client and every future browser/CLI consumer
+**Version**: 1.0.0
+**Status**: frozen
+**Last Updated**: 2026-05-22
+
+## Purpose
+
+Defines the uniform RFC 7807 ProblemDetails / ValidationProblemDetails shape every public endpoint emits for client (4xx) errors. The contract exists so consumers can pattern-match against a single error payload regardless of which endpoint they called and regardless of whether the failure happened at the deserializer (unknown field, type mismatch) or at a FluentValidation rule (missing field, out-of-range value, business invariant).
+
+The contract is enforced by two collaborating pieces of shared infrastructure:
+
+1. **Deserializer-level rejection** — `JsonSerializerOptions.UnmappedMemberHandling.Disallow` (.NET 8+) catches unknown fields, type mismatches, and malformed JSON. The framework's `BadHttpRequestException` carries a `System.Text.Json.JsonException` as its inner exception; `GlobalExceptionHandler` (`SatelliteProvider.Api/GlobalExceptionHandler.cs`) extracts the JSON path and emits a `ValidationProblemDetails` body.
+2. **Business-rule rejection** — `FluentValidation` (12.0.0) validators wired through the generic `ValidationEndpointFilter<T>` (`SatelliteProvider.Api/Validators/ValidationEndpointFilter.cs`). Endpoints opt in via `RouteHandlerBuilder.WithValidation<T>()`. The filter calls `Results.ValidationProblem(result.ToDictionary())`, which produces an identically-shaped body.
+
+Both paths produce `Content-Type: application/problem+json`. Both populate the same `errors` map keyed by request-body field path.
+
+## Shape
+
+### Validation failures (HTTP 400)
+
+```jsonc
+{
+  "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
+  "title": "One or more validation errors occurred.",
+  "status": 400,
+  "errors": {
+    "tiles[0].z": ["The z field is required."],
+    "tiles[1]": ["The JSON property 'tileZoom' could not be mapped to any .NET member contained in type 'TileCoord'."]
+  }
+}
+```
+
+Per-field rules:
+
+| Field | Type | Required | Description |
+|-------|------|----------|-------------|
+| `type` | URI string | yes | RFC 7231 §6.5.1 link for 400 (FluentValidation default) or RFC 9110 link for 5xx (server errors). |
+| `title` | string | yes | Human-readable summary. Validation failures use `"One or more validation errors occurred."`; non-validation 400s use `"Bad Request"`. |
+| `status` | integer | yes | Echoes the HTTP status code. |
+| `errors` | object\<string, string[]\> | required for validation failures | Keys are JSON-path-style request-body field names. Values are arrays of error messages. Empty array is not allowed for a present key. |
+| `traceId` | string | optional | Correlation identifier for log lookup. Populated for 5xx; may be populated for 4xx if FluentValidation surfaces it. |
+
+### Field-path keys in `errors`
+
+Field-path keys MUST follow the same casing as the request body's JSON (camelCase root + dotted/indexed access for nested types). Examples:
+
+| Failure type | Example field-path key |
+|--------------|------------------------|
+| Missing root field | `tiles` |
+| Missing nested field on tile entry | `tiles[0].z` |
+| Out-of-range value | `tiles[3].z` |
+| Unknown root field | `unknownField` (or `$` if path unavailable) |
+| Unknown field inside nested object | `tiles[0].foo` |
+| Both/neither XOR violation | `$` (request-body root) |
+
+The deserialization-failure path (unknown field, type mismatch) sets the key to the JSON path System.Text.Json reports. FluentValidation paths use the property names from `RuleFor(x => x.Tiles)` etc., which automatically produce camelCase paths matching the request body.
+
+### Generic 4xx errors (no validation context)
+
+Some 4xx responses (auth failures, not-found, framework binding errors that aren't JSON deserialization) emit the simpler ProblemDetails shape — no `errors` map:
+
+```jsonc
+{
+  "type": "https://datatracker.ietf.org/doc/html/rfc9110#name-401-unauthorized",
+  "title": "Unauthorized",
+  "status": 401
+}
+```
+
+| Status | Title | Notes |
+|--------|-------|-------|
+| 400 (non-validation) | `"Bad Request"` | Framework binding failures that don't carry a JsonException (rare). |
+| 401 | (varies) | Emitted by the JwtBearer middleware via `WWW-Authenticate`; body content depends on framework version. |
+| 403 | (varies) | Authorization failure. Body shape governed by ASP.NET Core defaults. |
+| 404 | (varies) | Per-endpoint default; some endpoints emit a custom NotFound body (e.g. region/route). |
+| 501 | `"Not implemented"` | Stub endpoints (e.g. `/api/satellite/tiles/mgrs`). |
+
+### 5xx errors
+
+Server errors emit the simpler ProblemDetails shape with a `correlationId` extension property pointing at the server log entry. The body NEVER contains the original exception message or stack trace (sanitization landed in AZ-353):
+
+```jsonc
+{
+  "type": "https://datatracker.ietf.org/doc/html/rfc9110#name-500-internal-server-error",
+  "title": "Internal Server Error",
+  "status": 500,
+  "detail": "An unexpected error occurred. Use the correlationId to look up the server log entry.",
+  "correlationId": "0HMBR..."
+}
+```
+
+## Invariants
+
+- **Inv-1**: Every 4xx and 5xx response sets `Content-Type: application/problem+json`.
+- **Inv-2**: Validation failures (HTTP 400 from FluentValidation OR from JSON deserialization with a JsonException inner exception) always include an `errors` object.
+- **Inv-3**: Each `errors` entry has at least one message. Empty arrays are forbidden.
+- **Inv-4**: Field-path keys in `errors` use the same casing as the request body (camelCase root, dotted/indexed access for nested types).
+- **Inv-5**: 5xx responses include a `correlationId` extension property; 4xx responses do not. No 4xx response leaks server-internal state (DB connection strings, secrets, internal stack frames).
+- **Inv-6**: Unknown fields at root or in any nested object are rejected with HTTP 400 — not silently dropped. The error key names the offending field path.
+- **Inv-7**: Type mismatches (e.g. string where integer expected) are rejected with HTTP 400 and the error key names the offending field path.
+
+## Non-Goals
+
+- **Not covered**: i18n / translated error messages. Messages are English-only; consumers translate on their side if needed.
+- **Not covered**: error codes. The `errors` map carries human-readable strings, not stable error codes. Consumers MUST NOT pattern-match on the string content; they pattern-match on field paths.
+- **Not covered**: rate-limit or quota errors. Those are a separate concern with their own contract (TBD).
+- **Not covered**: 1xx / 3xx responses. Those are framework-level and not shaped by this contract.
+
+## Versioning Rules
+
+- **Patch (1.0.x)**: Documentation clarifications, additional invariants that do not change wire behavior.
+- **Minor (1.x.0)**: Adding an optional extension field to ProblemDetails (e.g., `correlationId` becoming standard for 4xx as well as 5xx). Adding new field-path conventions that are backward-compatible (e.g., a new `[i]` indexing rule).
+- **Major (2.0.0)**: Changing `errors` map shape (e.g. swapping to error-code keys). Changing `Content-Type`. Renaming `errors` to anything else. Removing `correlationId` from 5xx.
+
+## Test Cases
+
+| Case | Input | Expected | Notes |
+|------|-------|----------|-------|
+| validation-missing-field | Inventory request with `tiles: [{ "z": 18 }]` (x, y missing) | HTTP 400 + `errors["tiles[0].x"]` and `errors["tiles[0].y"]` populated | Inv-2, Inv-4 |
+| validation-out-of-range | Inventory request with `tiles: [{ "z": 30, "x": 1, "y": 1 }]` | HTTP 400 + `errors["tiles[0].z"]` mentioning supported zoom range | Inv-2 |
+| validation-unknown-root-field | Body `{ "unknownField": 42, "tiles": [...] }` | HTTP 400 + `errors["unknownField"]` populated with "could not be mapped" | Inv-6 |
+| validation-unknown-nested-field | Body `{ "tiles": [{ "z": 18, "x": 1, "y": 1, "foo": 42 }] }` | HTTP 400 + `errors["tiles[0].foo"]` populated | Inv-6 |
+| validation-type-mismatch | Body `{ "tiles": [{ "z": "eighteen" }] }` | HTTP 400 + `errors["tiles[0].z"]` populated | Inv-7 |
+| validation-xor-both-populated | Body with both `tiles` and `locationHashes` populated | HTTP 400 + `errors["$"]` (or root key) populated | Inv-2 |
+| 5xx-includes-correlation-id | Endpoint throws unhandled exception | HTTP 500 + `correlationId` extension matching `httpContext.TraceIdentifier` | Inv-5 |
+| 5xx-no-secret-leak | Exception message contains a connection string with `Password=hunter2` | HTTP 500 body contains neither the password nor the connection string | Inv-5 |
+
+## Change Log
+
+| Version | Date | Change | Author |
+|---------|------|--------|--------|
+| 1.0.0 | 2026-05-22 | Initial contract — uniform RFC 7807 ValidationProblemDetails shape for FluentValidation business-rule failures + JSON deserialization failures, including unknown-field rejection (`UnmappedMemberHandling.Disallow`). Sanitized ProblemDetails for 5xx (preserves AZ-353). Produced by AZ-795. | autodev (Step 10, cycle 7) |

_docs/02_document/contracts/api/tile-inventory.md

@@ -1,11 +1,11 @@
 # Contract: tile-inventory
 
 **Component**: WebApi (`SatelliteProvider.Api`) producing rows via TileDownloader (`SatelliteProvider.Services.TileDownloader`)
-**Producer task**: AZ-505 — `_docs/02_tasks/todo/AZ-505_tile_inventory_http2_leaflet_index.md`
+**Producer task**: AZ-505 — `_docs/02_tasks/done/AZ-505_tile_inventory_http2_leaflet_index.md` (initial); AZ-794 — `_docs/02_tasks/done/AZ-794_inventory_field_rename_osm.md` (v2.0.0 wire-format rename); AZ-796 — `_docs/02_tasks/done/AZ-796_inventory_endpoint_validation.md` (FluentValidation + ProblemDetails wiring)
 **Consumer tasks**: `gps-denied-onboard` AZ-316 (`c11_tile_downloader`), future mission-planner UI cache-sizing flows
-**Version**: 1.0.0
+**Version**: 2.0.0
 **Status**: frozen
-**Last Updated**: 2026-05-12
+**Last Updated**: 2026-05-22
 
 ## Purpose
 
@@ -27,14 +27,14 @@ The request MUST carry a valid JWT (AZ-487). No `permissions` claim is required
 
 ### Request body
 
-Exactly one of `tiles` OR `locationHashes` MUST be populated. Sending both, or neither, is HTTP 400.
+Exactly one of `tiles` OR `locationHashes` MUST be populated. Sending both, or neither, is HTTP 400 (validation enforced by `InventoryRequestValidator` per AZ-796).
 
 ```jsonc
-// Form A — coord-keyed
+// Form A — coord-keyed (v2.0.0; AZ-794 renamed tileZoom/tileX/tileY → z/x/y)
 {
   "tiles": [
-    { "tileZoom": 18, "tileX": 154321, "tileY": 95812 },
+    { "z": 18, "x": 154321, "y": 95812 },
-    { "tileZoom": 18, "tileX": 154322, "tileY": 95812 }
+    { "z": 18, "x": 154322, "y": 95812 }
   ]
 }
 
@@ -51,28 +51,31 @@ Per-field constraints:
 
 | Field | Type | Required | Description | Constraints |
 |-------|------|----------|-------------|-------------|
-| `tiles` | `TileCoord[]` | yes (XOR `locationHashes`) | Slippy-map tile coords | Up to 5000 entries per request. Each entry MUST have all three of `tileZoom`, `tileX`, `tileY`. |
+| `tiles` | `TileCoord[]` | yes (XOR `locationHashes`) | Slippy-map tile coords | Up to 5000 entries per request. Each entry MUST have all three of `z`, `x`, `y`. |
 | `locationHashes` | `UUID[]` | yes (XOR `tiles`) | Pre-computed UUIDv5 `location_hash` values | Up to 5000 entries per request. Each entry MUST be RFC 4122 UUID. |
 
 Hard cap: **5000 entries per request** (`SatelliteProvider.Common.DTO.TileInventoryLimits.MaxEntriesPerRequest`). Anything larger → HTTP 400. The cap is 2× the AC-4 perf gate (2500 tiles).
 
+Strict parsing: unknown fields at root or nested under any tile entry are rejected with HTTP 400 by `JsonSerializerOptions.UnmappedMemberHandling.Disallow` (AZ-795). The error body conforms to `error-shape.md` v1.0.0.
+
 ### `TileCoord` (per entry under `tiles`)
 
-| Field | Type | Required | Description |
+| Field | Type | Required | Description | Range |
-|-------|------|----------|-------------|
+|-------|------|----------|-------------|-------|
-| `tileZoom` | integer | yes | Slippy-map zoom level |
+| `z` | integer | yes | Slippy-map zoom level | 0–22 (matches `tile_zoom` schema constraint) |
-| `tileX` | integer | yes | Slippy-map tile column |
+| `x` | integer | yes | Slippy-map tile column | 0 ≤ x < 2^z |
-| `tileY` | integer | yes | Slippy-map tile row |
+| `y` | integer | yes | Slippy-map tile row | 0 ≤ y < 2^z |
 
 ### Response body
 
 ```jsonc
+// v2.0.0 — coord triple uses z/x/y (AZ-794)
 {
   "results": [
     {
-      "tileZoom": 18,
+      "z": 18,
-      "tileX": 154321,
+      "x": 154321,
-      "tileY": 95812,
+      "y": 95812,
       "locationHash": "ad8c1c4c-2b27-5af4-902f-9c8baeed1e84",
       "present": true,
       "id": "5d83…",
@@ -82,9 +85,9 @@ Hard cap: **5000 entries per request** (`SatelliteProvider.Common.DTO.TileInvent
       "resolutionMPerPx": 0.78125
     },
     {
-      "tileZoom": 18,
+      "z": 18,
-      "tileX": 154322,
+      "x": 154322,
-      "tileY": 95812,
+      "y": 95812,
       "locationHash": "5b8d0c2e-7f1a-5d3b-9c5e-1f3a8e7d2b6c",
       "present": false,
       "id": null,
@@ -101,10 +104,10 @@ Per-entry fields:
 
 | Field | Type | Present when... | Description |
 |-------|------|-----------------|-------------|
-| `tileZoom` | integer | always (Form A); zeroed (Form B) | Echoes the request entry's `tileZoom` when input was `tiles`; `0` when input was `locationHashes` (caller already knows the cell). |
+| `z` | integer | always (Form A); zeroed (Form B) | Echoes the request entry's `z` when input was `tiles`; `0` when input was `locationHashes` (caller already knows the cell). |
-| `tileX` | integer | always (Form A); zeroed (Form B) | Same as `tileZoom`. |
+| `x` | integer | always (Form A); zeroed (Form B) | Same as `z`. |
-| `tileY` | integer | always (Form A); zeroed (Form B) | Same as `tileZoom`. |
+| `y` | integer | always (Form A); zeroed (Form B) | Same as `z`. |
-| `locationHash` | UUIDv5 | always | `UUIDv5(TileNamespace, "{tileZoom}/{tileX}/{tileY}")`. Populated even when `present=false` so callers can persist the deterministic hash. |
+| `locationHash` | UUIDv5 | always | `UUIDv5(TileNamespace, "{z}/{x}/{y}")`. Populated even when `present=false` so callers can persist the deterministic hash. |
 | `present` | bool | always | `true` iff a row exists in `tiles` with this `location_hash`. |
 | `id` | UUID | present=true | Most-recent row's `tiles.id`. Deterministic UUIDv5 for AZ-503+ rows; random for legacy rows. |
 | `capturedAt` | ISO-8601 UTC | present=true | `tiles.captured_at`. |
@@ -120,15 +123,35 @@ Order invariant: `results[i]` corresponds to `request.tiles[i]` (or `request.loc
 |--------|------|--------------|----------|--------------|
 | `POST` | `/api/satellite/tiles/inventory` | `TileInventoryRequest` | `TileInventoryResponse` | 200, 400, 401 |
 
+## Error shape
+
+All `400` responses conform to `_docs/02_document/contracts/api/error-shape.md` v1.0.0. Both wire-format failures (unknown fields, type mismatches; via the JSON deserializer) and business-rule failures (XOR violation, missing `z`/`x`/`y`, out-of-range zoom; via `InventoryRequestValidator`) emit a `ValidationProblemDetails` body with an `errors` map keyed by JSON-path-style field names. Example:
+
+```jsonc
+{
+  "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
+  "title": "One or more validation errors occurred.",
+  "status": 400,
+  "errors": {
+    "tiles[0].z": ["The z field is required."],
+    "tiles[1]": ["The JSON property 'tileZoom' could not be mapped to any .NET member contained in type 'TileCoord'."]
+  }
+}
+```
+
+The first key shows a FluentValidation rule miss; the second shows a deserializer rejection of the *old* v1.x field name (callers still on the old shape get an explicit failure, not a silent 200 with zeroed coordinates — exactly the behaviour AZ-794 + AZ-796 were filed to enforce after the AZ-777 Phase 1 Jetson probe).
+
 ## Invariants
 
 - **Inv-1**: Exactly one of `request.tiles` and `request.locationHashes` is populated and non-empty. Both-populated → 400; both-empty → 400.
 - **Inv-2**: `len(response.results) == len(request.tiles)` OR `len(request.locationHashes)` — never less, never more.
-- **Inv-3**: `response.results[i].locationHash` is deterministic from `request.tiles[i]` (UUIDv5 over `"{zoom}/{x}/{y}"` with `Uuidv5.TileNamespace`) when Form A is used, or equals `request.locationHashes[i]` when Form B is used.
+- **Inv-3**: `response.results[i].locationHash` is deterministic from `request.tiles[i]` (UUIDv5 over `"{z}/{x}/{y}"` with `Uuidv5.TileNamespace`) when Form A is used, or equals `request.locationHashes[i]` when Form B is used.
 - **Inv-4**: `response.results[i].present == true` iff a row exists in `tiles` with `location_hash = response.results[i].locationHash`.
 - **Inv-5**: When `present=true`, the returned row is the most-recent across sources/flights ordered by `(captured_at DESC, updated_at DESC, id DESC)` — same rule as `ITileRepository.GetByTileCoordinatesAsync` per `tile-storage` v2.0.0.
 - **Inv-6**: When `present=false`, `id` / `capturedAt` / `source` / `flightId` / `resolutionMPerPx` are all `null`.
 - **Inv-7**: `request.tiles.length` and `request.locationHashes.length` MUST be ≤ `TileInventoryLimits.MaxEntriesPerRequest` (5000); over the cap → 400.
+- **Inv-8** (AZ-795 / AZ-796): Each `tiles[i].z` MUST satisfy `0 ≤ z ≤ 22`. Each `tiles[i].x` and `tiles[i].y` MUST satisfy `0 ≤ value < 2^z`. Out-of-range → 400 with `errors["tiles[i].z|x|y"]` populated.
+- **Inv-9** (AZ-795): Unknown fields at root or in any nested object are rejected with HTTP 400; the error key names the offending JSON path.
 
 ## Non-Goals
 
@@ -139,12 +162,13 @@ Order invariant: `results[i]` corresponds to `request.tiles[i]` (or `request.loc
 - **Not covered**: production deployment topology. Dev Kestrel runs `Http1AndHttp2` directly over TLS on port 8080 with a self-signed cert (`./certs/api.pfx`, generated by `scripts/run-tests.sh`) so ALPN can advertise `h2` — browsers and programmatic clients (httpx `http2=True`, .NET `HttpClient` with `HttpVersionPolicy.RequestVersionExact`) both multiplex over a single TLS connection. In production, TLS is expected to terminate at the ingress (Envoy / nginx / ALB) and Kestrel runs HTTP/2 cleartext behind it; AZ-505 verifies the protocol multiplexing semantics here, not the production termination layer.
 - **Not covered**: PMTiles or tar/multipart bundle endpoints. Rejected by AZ-503 parent rationale (HTTP/2 multistream is sufficient).
 - **Not covered**: write operations. Inventory is read-only; UAV writes go through `POST /api/satellite/upload` (`uav-tile-upload.md` v1.1.0).
+- **Not covered**: backward-compatibility shim for v1.0.0 (`tileZoom/tileX/tileY`) field names. Per AZ-794 (Option 1 hard switch — single known consumer), v2.0.0 is the only accepted body shape; v1.x consumers receive HTTP 400 with `errors[*]: ["could not be mapped"]`. There is no transitional accept-both period.
 
 ## Versioning Rules
 
-- **Patch (1.0.x)**: Documentation clarifications, additional invariants that do not change wire behavior.
+- **Patch (2.0.x)**: Documentation clarifications, additional invariants that do not change wire behavior.
-- **Minor (1.x.0)**: Adding an optional response field that consumers may safely ignore (e.g., the future `estimatedBytes`); raising the entry cap; adding a third request form alongside the current two.
+- **Minor (2.x.0)**: Adding an optional response field that consumers may safely ignore (e.g., the future `estimatedBytes`); raising the entry cap; adding a third request form alongside the current two.
-- **Major (2.0.0)**: Changing the response ordering rule; removing `present`; lowering the entry cap; making `flightId` required; adding voting / trust filtering to the read path.
+- **Major (3.0.0)**: Changing the response ordering rule; removing `present`; lowering the entry cap; making `flightId` required; adding voting / trust filtering to the read path; renaming the `z`/`x`/`y` triple again.
 
 ## Test Cases
 
@@ -152,9 +176,15 @@ Order invariant: `results[i]` corresponds to `request.tiles[i]` (or `request.loc
 |------|-------|----------|-------|
 | ordering-mixed-present-absent | 25 coords, 12 seeded + 13 absent, interleaved | 25 entries in request order; 12 present (id/capturedAt/source populated), 13 absent (only locationHash populated) | AC-1 |
 | most-recent-across-sources | Cell with `google_maps captured_at=T1` and `uav captured_at=T2 > T1`; coord request | `present=true`, `source='uav'`, `id` = UAV row's id | Inv-5 |
-| validation-both-populated | Body with both `tiles` and `locationHashes` | HTTP 400 | Inv-1 |
+| validation-both-populated | Body with both `tiles` and `locationHashes` | HTTP 400 + ValidationProblemDetails | Inv-1 + AZ-796 |
-| validation-neither-populated | Empty body or body with both fields empty | HTTP 400 | Inv-1 |
+| validation-neither-populated | Empty body or body with both fields empty | HTTP 400 + ValidationProblemDetails | Inv-1 + AZ-796 |
-| validation-over-cap | 5001 entries | HTTP 400 | Inv-7 |
+| validation-over-cap | 5001 entries | HTTP 400 + ValidationProblemDetails | Inv-7 + AZ-796 |
+| validation-missing-z | `tiles: [{ x: 1, y: 1 }]` | HTTP 400 + `errors["tiles[0].z"]` populated | Inv-8 + AZ-796 |
+| validation-out-of-range-z | `tiles: [{ z: 30, x: 1, y: 1 }]` | HTTP 400 + `errors["tiles[0].z"]` mentioning range | Inv-8 + AZ-796 |
+| validation-out-of-range-x | `tiles: [{ z: 0, x: 5, y: 0 }]` (2^0 = 1) | HTTP 400 + `errors["tiles[0].x"]` populated | Inv-8 + AZ-796 |
+| validation-unknown-root-field | Body with `unknownField: 42` plus `tiles: [...]` | HTTP 400 + `errors["unknownField"]` | Inv-9 + AZ-795 |
+| validation-unknown-nested-field | `tiles: [{ z: 18, x: 1, y: 1, foo: 42 }]` | HTTP 400 + `errors["tiles[0].foo"]` | Inv-9 + AZ-795 |
+| validation-old-field-name-tileZoom | `tiles: [{ tileZoom: 18, tileX: 1, tileY: 1 }]` (v1.x shape) | HTTP 400 + `errors["tiles[0].tileZoom"]` ("could not be mapped") | AZ-794 + Inv-9 |
 | auth-anonymous | No Bearer token | HTTP 401 | Standard `.RequireAuthorization()` baseline |
 | perf-2500-tiles | 2500-entry request against populated DB | p95 ≤ 1000 ms over 20 calls | AC-4 |
 | http2-multiplexing | 20 concurrent `GET /tiles/{z}/{x}/{y}` over a single H2 connection | All 20 responses `HttpResponseMessage.Version == 2.0`; ETag + Cache-Control preserved | AC-5; cross-references `tile-inventory.md` because Kestrel H2 is configured in the same PBI |
@@ -163,4 +193,5 @@ Order invariant: `results[i]` corresponds to `request.tiles[i]` (or `request.loc
 
 | Version | Date | Change | Author |
 |---------|------|--------|--------|
+| 2.0.0 | 2026-05-22 | **BREAKING**: per-entry coord triple renamed `tileZoom/tileX/tileY` → `z/x/y` (request `tiles[i]` and response `results[i]`) to align with the URL slippy-map convention already used by `GET /tiles/{z}/{x}/{y}`. AZ-794 ships as Option 1 hard switch; v1.x clients receive HTTP 400 with explicit "could not be mapped" errors. Adds Inv-8 (range constraints on z/x/y) + Inv-9 (unknown-field rejection); references `error-shape.md` v1.0.0 for the uniform 400 body shape. AZ-796 wires `InventoryRequestValidator` for Inv-1 / Inv-7 / Inv-8 enforcement. Cycle 7 — autodev Step 10. | autodev (Step 10, cycle 7) |
 | 1.0.0 | 2026-05-12 | Initial contract — `POST /api/satellite/tiles/inventory` with Form A (coords) / Form B (hashes) XOR validation, 5000-entry cap, most-recent-across-sources selection rule, ordering invariant. Produced by AZ-505. | autodev (Step 10, cycle 6) |

_docs/02_document/deployment/containerization.md

@@ -11,7 +11,7 @@
 
 | Service | Image | Ports (host:container) | Purpose |
 |---------|-------|------------------------|---------|
-| postgres | postgres:16 | 5432:5432 | Database |
+| postgres | postgres:16 | 5433:5432 | Database (host port 5433 chosen to avoid conflicts with sibling-project Postgres instances on dev laptops) |
 | api | Custom (Dockerfile) | 18980:8080, 18981:8081 | Application |
 
 ## Volumes

_docs/02_document/module-layout.md

@@ -126,9 +126,12 @@ The cycle-1 (AZ-487) and cycle-2 (AZ-488) code reviews each surfaced an F1 (Low
   - `SatelliteProvider.Api/Authentication/AuthenticationServiceCollectionExtensions.cs` (added by AZ-487; `AddSatelliteJwt(IConfiguration)` registers `JwtBearer` with the suite-wide HS256 contract from `suite/_docs/10_auth.md`; validates `JWT_SECRET` ≥ 32 bytes at startup)
   - `SatelliteProvider.Api/Authentication/PermissionsRequirement.cs` + `PermissionsAuthorizationHandler` + `SatellitePermissions` (added by AZ-488; custom requirement that accepts a `permissions` claim shaped as either a single string or a JSON array; powers the `UavUploadPolicy` requiring the `GPS` permission)
   - `SatelliteProvider.Api/DTOs/UavTileBatchUploadRequest.cs` (added by AZ-488; multipart form binding envelope — kept in WebApi because it depends on `IFormFileCollection` + `[FromForm]`, both API-layer types)
+  - `SatelliteProvider.Api/Validators/ValidationEndpointFilter.cs` + `ValidationEndpointFilterExtensions.cs` (added by AZ-795; generic `IEndpointFilter<T>` that runs the registered `IValidator<T>` and returns `Results.ValidationProblem` on failure; opt-in via `RouteHandlerBuilder.WithValidation<T>()`)
+  - `SatelliteProvider.Api/Validators/InventoryRequestValidator.cs` + `TileCoordValidator` (added by AZ-796; FluentValidation rules for `POST /api/satellite/tiles/inventory` — XOR `tiles`/`locationHashes`, per-array cap, slippy-map range checks)
+  - `SatelliteProvider.Api/Validators/GlobalValidatorConfig.cs` (added by AZ-795/AZ-796; idempotent `ApplyOnce()` configures `ValidatorOptions.Global.PropertyNameResolver` so `errors`-map keys are camelCase per `error-shape.md` Inv-4; called from `Program.cs` and from the test assembly's `ModuleInitializer`)
 - **Internal**: (none)
 - **Owns**: `SatelliteProvider.Api/**`
-- **PackageReferences (added by AZ-487, bumped by AZ-496, then by AZ-500)**: `Microsoft.AspNetCore.Authentication.JwtBearer` 10.0.7 (pinned to the same minor patch as `Microsoft.AspNetCore.OpenApi` 10.0.7; AZ-496 bumped both packages from 8.0.21 → 8.0.25 in cycle 3 to close cycle-1 D1 + cycle-2 D3 supply-chain findings, then AZ-500 bumped both 8.0.25 → 10.0.7 in cycle 4 as part of the .NET 8 → .NET 10 migration; AZ-500 also bumped `Swashbuckle.AspNetCore` 6.6.2 → 10.1.7 here to land Microsoft.OpenApi 2.x compat required by ASP.NET Core 10).
+- **PackageReferences (added by AZ-487, bumped by AZ-496, then by AZ-500; AZ-795 added FluentValidation)**: `Microsoft.AspNetCore.Authentication.JwtBearer` 10.0.7 (pinned to the same minor patch as `Microsoft.AspNetCore.OpenApi` 10.0.7; AZ-496 bumped both packages from 8.0.21 → 8.0.25 in cycle 3 to close cycle-1 D1 + cycle-2 D3 supply-chain findings, then AZ-500 bumped both 8.0.25 → 10.0.7 in cycle 4 as part of the .NET 8 → .NET 10 migration; AZ-500 also bumped `Swashbuckle.AspNetCore` 6.6.2 → 10.1.7 here to land Microsoft.OpenApi 2.x compat required by ASP.NET Core 10). `FluentValidation` + `FluentValidation.DependencyInjectionExtensions` 12.0.0 added by AZ-795 to back the strict-input-validation epic.
 - **Imports from**: Common (incl. AZ-488 UAV DTOs + `UavQualityConfig`), DataAccess, TileDownloader (incl. AZ-488 `IUavTileUploadHandler`), RegionProcessing, RouteManagement
 - **Consumed by**: (none — top-level entry point)
 

_docs/02_tasks/_dependencies_table.md

@@ -112,6 +112,21 @@ Source: cycle-5 retro Action 2 — AZ-505 is the deferred half of AZ-503 (invent
 |------|-------|-----------|--------|--------|
 | AZ-505 | Tile inventory endpoint + HTTP/2 + leaflet covering index | AZ-503 (HARD, Blocks-linked, satisfied by cycle 5) | 3 | To Do (cycle 6) |
 
+### Step 9 cycle 7 — New Task: API quality follow-up (cross-repo from gps-denied-onboard AZ-777)
+
+Source: cycle-7 New Task adoption of three Jira tickets originally filed on 2026-05-22 by the `gps-denied-onboard` agent during AZ-777 Phase 1 Jetson probing of the parent-suite `satellite-provider` service. Two API-quality concerns about the inventory endpoint were surfaced:
+
+1. **Field-name inconsistency** — URL path uses OSM-standard `z/x/y`; JSON body uses verbose `tileZoom/tileX/tileY` for the same concept (AZ-794).
+2. **Permissive parsing** — missing required fields silently coerce to `0`; unknown fields silently drop. Real client typos masquerade as valid (0,0,0) requests with collision-prone `locationHash` (AZ-795 epic + AZ-796 first child).
+
+Adopted into satellite-provider cycle 7 with the recommended ordering: shared validation infra (AZ-795) → wire-format rename (AZ-794) → first per-endpoint validator child (AZ-796). AZ-795 is structured as an Epic that ALSO ships shared infrastructure (FluentValidation + global ProblemDetails filter + `JsonSerializerOptions.UnmappedMemberHandling.Disallow`); future per-endpoint child tasks under AZ-795 to be added by parent-suite team as the public-endpoint surface is enumerated.
+
+| Task | Title | Depends On | Points | Status |
+|------|-------|-----------|--------|--------|
+| AZ-794 | Inventory body fields: rename `tileZoom/tileX/tileY` → `z/x/y` (OSM convention) | — (coordinate release with AZ-795 / AZ-796) | 3 | Done (cycle 7) |
+| AZ-795 | Strict input validation across all public endpoints (FluentValidation + ProblemDetails) — **Epic with shared-infra ship** | — (children gated on shared infra landing first) | — (epic; shared-infra estimate 5–8 pts; per-endpoint children ~3 pts each) | Done — shared infra shipped (cycle 7); future per-endpoint child tasks open |
+| AZ-796 | Strict validation for inventory endpoint (POST /api/satellite/tiles/inventory) | AZ-795 (HARD — shared infra); coordinate with AZ-794 | 3 | Done (cycle 7) |
+
 ## Execution Order
 
 ### Step 6
@@ -169,6 +184,15 @@ Single task; consumes the AZ-503-foundation columns landed in cycle 5.
 
 1. AZ-505 (3 SP) — Tile inventory endpoint + HTTP/2 + Leaflet covering index. Self-contained but produces TWO contract artifacts (new `contracts/api/tile-inventory.md` v1.0.0 + bump `contracts/data-access/tile-storage.md` v1.0.0 → v2.0.0 per architecture.md).
 
+### Step 9 cycle 7 (AZ-794 / AZ-795 / AZ-796)
+
+Adopted into cycle 7. Ordering:
+
+1. AZ-795 shared infrastructure (FluentValidation + global ProblemDetails filter + `JsonSerializerOptions.UnmappedMemberHandling.Disallow`) — gates every per-endpoint child.
+2. AZ-794 (rename) — lands the final wire-format names so AZ-796 validators can use them from day one.
+3. AZ-796 (inventory validator) — first per-endpoint child; serves as reference implementation for sibling per-endpoint child tasks.
+4. Sibling per-endpoint child tasks under AZ-795 — added by parent-suite team as they enumerate the surface from `/swagger/v1/swagger.json` (out of cycle 7 scope; future cycles).
+
 ## Total Effort
 
 Step 6: 6 tasks, 17 story points
@@ -180,6 +204,7 @@ Step 9 cycle 3: 6 tasks created (AZ-491 = 3 pts, AZ-492 = 3 pts, AZ-493 = 2 pts,
 Step 9 cycle 4: 1 task created (AZ-500 = 5 pts)
 Step 9 cycle 5: 3 tasks tracked (AZ-503 = 3 pts foundation-half, AZ-504 = 1 pt, AZ-505 = 3 pts split-off-deferred) — 4 pts committed to cycle 5, 3 pts deferred to cycle 6
 Step 9 cycle 6: 1 task scheduled (AZ-505 = 3 pts) — consumed from cycle-5 deferral
+Step 9 cycle 7: 3 tasks adopted (AZ-794 = 3 pts rename, AZ-795 = epic with 5–8 pts shared-infra ship, AZ-796 = 3 pts first per-endpoint child) — total ~11–14 pts (over the 2–5 pts/cycle preference; AZ-795's shared-infra ship is the heavy item). Origin: gps-denied-onboard AZ-777 Phase 1 Jetson probe (2026-05-22). Sibling per-endpoint child tasks under AZ-795 to be added in future cycles as the parent-suite team enumerates the endpoint surface.
 
 ## Coverage Verification
 

_docs/02_tasks/done/AZ-794_inventory_field_rename_osm.md

@@ -0,0 +1,94 @@
+# Inventory API: rename body fields to OSM-style z/x/y
+
+**Task**: AZ-794_inventory_field_rename_osm
+**Name**: Rename inventory body fields tileZoom/tileX/tileY → z/x/y (OSM convention)
+**Description**: Align the `POST /api/satellite/tiles/inventory` body shape with the URL-path slippy-map convention (`{z}/{x}/{y}`). Same coordinate concept is named two different ways inside the same API today; this task makes the body match the URL.
+**Complexity**: 3 points (recommended; final call by parent-suite team)
+**Dependencies**: — (coordinate release window with AZ-795 / AZ-796 to bundle the breaking changes)
+**Component**: SatelliteProvider.Api + SatelliteProvider.Common (DTOs)
+**Tracker**: AZ-794 (https://denyspopov.atlassian.net/browse/AZ-794)
+**Epic**: — (related to AZ-795 input-validation epic via Jira "Relates" link)
+**Originating ticket**: gps-denied-onboard AZ-777 Phase 1 (Jetson probe, 2026-05-22)
+
+## Origin
+
+Surfaced during gps-denied-onboard AZ-777 Phase 1 Jetson probing of the parent-suite `satellite-provider` service. The reviewing engineer noted that the inventory endpoint uses two different naming conventions for the same coordinate concept:
+
+- URL: `GET /tiles/{z}/{x}/{y}` — OSM/XYZ-standard short names.
+- Body: `{"tiles": [{"tileZoom":12,"tileX":2424,"tileY":1424}]}` — verbose .NET-style names.
+
+Conformance to the URL convention end-to-end (both URL and body) aligns with 20 years of slippy-map ecosystem norms (OSM, Google, Mapbox, Bing, Leaflet, MapLibre) and removes the need for consumers to translate at the boundary. Jira AZ-794 is the authoritative spec; this file mirrors the in-workspace-only sections that the satellite-provider implementer will need.
+
+## Problem
+
+Same coordinate concept; two names; same API:
+- URL path uses `z`, `x`, `y`.
+- Request and response bodies use `tileZoom`, `tileX`, `tileY`.
+
+Every consumer that thinks in slippy-map vocabulary has to translate at the boundary. Wire size is also ~3× larger than necessary on the field names (a 900-tile inventory request carries ~5 KB of `tileZoom`/`tileX`/`tileY` vs ~1.7 KB of `z`/`x`/`y`).
+
+## Outcome
+
+- `POST /api/satellite/tiles/inventory` request body uses `{"tiles": [{"z":...,"x":...,"y":...}]}` per tile entry.
+- Response body uses `{"results": [{"z":...,"x":...,"y":...,"locationHash":...,"present":...,...}]}` per entry. All non-coord fields (`locationHash`, `present`, `id`, `capturedAt`, `source`, `flightId`, `resolutionMPerPx`) unchanged.
+- OpenAPI / Swagger spec updated to match.
+- Schema doc `_docs/02_document/contracts/api/tile-inventory.md` bumped (v1.x.0 → next major) with a Migration / Coexistence section.
+- Integration tests updated.
+- Release notes / migration guide entry naming AZ-794 as the breaking-rename owner.
+
+## Scope
+
+### Included
+
+- DTOs for the inventory request + response — exact file path to be confirmed by the implementer (likely `SatelliteProvider.Common/DTO/TileInventory.cs` per AZ-505 spec).
+- The MapPost handler / minimal-api endpoint registration in `SatelliteProvider.Api/Program.cs` (or wherever the inventory endpoint is wired today).
+- `SatelliteProvider.IntegrationTests/TileInventoryTests.cs` — update payload builders + response assertions.
+- `_docs/02_document/contracts/api/tile-inventory.md` — major version bump with Change Log entry naming this task.
+- Release notes / migration guide.
+
+### Excluded
+
+- The `GET /tiles/{z}/{x}/{y}` endpoint — already uses the correct names; no change.
+- Strict input validation — owned by AZ-796 (sibling under epic AZ-795).
+- Other endpoint renames.
+- Internal storage / query / repo-method names (`tile_zoom`, `tile_x`, `tile_y` DB columns) — wire-format change only.
+
+## Acceptance Criteria
+
+**AC-1: Request body uses short names**
+Given a POST body `{"tiles":[{"z":12,"x":2424,"y":1424}]}` with valid JWT
+When `POST /api/satellite/tiles/inventory` is called
+Then HTTP 200 with `results[0].z == 12`, `results[0].x == 2424`, `results[0].y == 1424` and a deterministic non-zero `locationHash`.
+
+**AC-2: Response body uses short names**
+Given a successful inventory call
+When the response is parsed
+Then every `results[i]` object contains `z`, `x`, `y` keys (not `tileZoom`, `tileX`, `tileY`). All other fields (`locationHash`, `present`, `id`, `capturedAt`, `source`, `flightId`, `resolutionMPerPx`) are unchanged byte-for-byte from the pre-rename contract.
+
+**AC-3: OpenAPI spec accuracy**
+Given `/swagger/v1/swagger.json` (or equivalent)
+When the InventoryRequest + InventoryEntry schemas are inspected
+Then they declare `z`, `x`, `y` (not the old names) as the required coordinate properties.
+
+**AC-4: Migration guidance documented**
+Given the rename ships
+Then `_docs/02_document/contracts/api/tile-inventory.md` is bumped to a new major version, the Change Log entry names AZ-794 and the breaking-rename, and a Migration / Coexistence section either (a) names the hard-switch release with the consumer-side bump coordinated, or (b) documents the accept-both transition window.
+
+## Rollout — pick one
+
+- **Option 1 — hard switch** (recommended while consumer count is small): rename atomically, bump API version, ship coordinated consumer update in the same release.
+- **Option 2 — accept-both transition**: server accepts both `z` and `tileZoom` on input for one release; response always uses short names; deprecation notice in release notes; remove long names in next release.
+
+## Constraints
+
+- **Breaking change** — coordinate with all known consumers before shipping. Known consumer at filing time: `gps-denied-onboard` `HttpTileDownloader` in `src/gps_denied_onboard/components/c11_tile_manager/tile_downloader.py`. Parent-suite team to enumerate the full consumer set before deciding rollout cadence.
+- **No internal storage rename** — DB columns (`tile_zoom`, `tile_x`, `tile_y`) stay as named. Wire-format change only; internal Postgres schema is out of scope.
+- **Coordinate with AZ-795 / AZ-796** — if validation strictness ships in the same release as the rename, the validators must use the new short names from day one. Recommended ordering: ship AZ-794 first, then AZ-795 shared infra, then AZ-796.
+
+## References
+
+- Jira AZ-794: https://denyspopov.atlassian.net/browse/AZ-794
+- Related: AZ-795 (validation epic), AZ-796 (inventory validation child)
+- Originating discovery: gps-denied-onboard AZ-777 (Phase 1 Jetson probe, 2026-05-22)
+- Current contract doc: `_docs/02_document/contracts/api/tile-inventory.md` v1.0.0
+- Known consumer side: `gps-denied-onboard/src/gps_denied_onboard/components/c11_tile_manager/tile_downloader.py`

_docs/02_tasks/done/AZ-795_strict_validation_epic.md

@@ -0,0 +1,153 @@
+# Strict input validation across all public endpoints (FluentValidation + ProblemDetails)
+
+**Task**: AZ-795_strict_validation_epic
+**Name**: Strict input validation across all public endpoints
+**Type**: Epic
+**Description**: Every public HTTP endpoint must reject malformed input with structured 4xx errors instead of silently coercing missing fields to zero / ignoring unknown fields. Recommended approach: FluentValidation + global ProblemDetails filter + `JsonSerializerOptions.UnmappedMemberHandling.Disallow`.
+**Complexity**: — (epic; rolls up children. Estimate: 5–8 pts shared infra + ~3 pts per per-endpoint child)
+**Dependencies**: — (per-endpoint children depend on shared infra landing first)
+**Component**: SatelliteProvider.Api (DI wiring + global filter + DTOs + validators)
+**Tracker**: AZ-795 (https://denyspopov.atlassian.net/browse/AZ-795)
+**Children**: AZ-796 (inventory endpoint — first concrete child); sibling per-endpoint tasks to be added by parent-suite team
+**Originating ticket**: gps-denied-onboard AZ-777 Phase 1 (Jetson probe, 2026-05-22)
+
+## Origin
+
+Discovered during gps-denied-onboard AZ-777 Phase 1 Jetson probing on 2026-05-22. A hand-typed inventory request with the wrong field names (`{"z","x","y"}` instead of the current `{"tileZoom","tileX","tileY"}`) returned **HTTP 200** with `(0,0,0)` coordinates and an identical `locationHash` for every entry. Real client bugs masquerade as valid results because the deserializer silently treats unknown fields as missing and missing fields as `default(int) = 0`.
+
+For a service that's the single source of truth about which satellite tiles exist, permissive parsing is actively dangerous: corruption downstream, confident wrong answers, hours of debugging on the consumer side.
+
+Jira AZ-795 is the authoritative spec; this file mirrors the in-workspace-only sections that the satellite-provider implementer will need.
+
+## Problem
+
+Every public-facing JSON endpoint on satellite-provider inherits the same Postel-permissive parsing default:
+- Missing required fields → silently `default(T)` (e.g. `0` for `int`).
+- Unknown fields → silently dropped (no `[JsonExtensionData]` capture, no log entry).
+- Wrong types → silently coerced where possible, silently dropped where not.
+
+No structured error response. The only contract-level signal a misbehaving client gets today is downstream weirdness (wrong `locationHash`, repeated identical results, etc.) — many hops away from the actual cause.
+
+## Outcome
+
+- Every public-facing JSON endpoint rejects malformed input with **HTTP 400 + RFC 7807 ProblemDetails** body naming the offending field(s).
+- Validators are testable in isolation (unit tests per `RuleFor`) and enforced by the HTTP layer without per-controller try/catch boilerplate.
+- Unknown-field rejection is wired at the deserializer level so typos can't reach a validator.
+- Uniform error response shape across all endpoints.
+- New `_docs/02_document/contracts/api/error-shape.md` v1.0.0 documenting the ProblemDetails contract every endpoint conforms to.
+
+## Recommended approach
+
+1. **FluentValidation** for input DTOs (declarative, composable, validators are testable units). Final stack choice belongs to the parent-suite team; if FluentValidation is ruled out by existing constraints, alternatives are stock DataAnnotations + custom model binders or hand-written `IValidator<T>`.
+2. **Global error filter / ASP.NET model-state behavior** that emits RFC 7807 ProblemDetails for every validation failure. No per-endpoint try/catch boilerplate.
+3. **Unknown-field rejection** at the deserializer: `JsonSerializerOptions.UnmappedMemberHandling.Disallow` (.NET 8+) or `Newtonsoft.Json` `MissingMemberHandling.Error`. Catches typos like `{"Z":12}` (uppercase) that no validator can catch after deserialization.
+
+## Error response contract (uniform across all endpoints)
+
+```json
+{
+  "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
+  "title": "One or more validation errors occurred.",
+  "status": 400,
+  "errors": {
+    "tiles[0].z": ["The z field is required."],
+    "tiles[1]": ["Unexpected field: 'tileZoom'."]
+  }
+}
+```
+
+Stable enough for consumers to pattern-match. Field names in `errors` paths must use the same casing as the request body (post-AZ-794 short names for the inventory endpoint).
+
+## Scope
+
+### Included — Shared infrastructure (this epic owns)
+
+- DI wiring for FluentValidation (or chosen alternative) in `SatelliteProvider.Api/Program.cs` (or appropriate composition root).
+- Global error filter / `Configure<ApiBehaviorOptions>(...)` for ProblemDetails formatting.
+- `JsonSerializerOptions` configuration for unknown-field rejection.
+- A validator-coverage table in `_docs/02_document/architecture.md` (or equivalent) listing each public endpoint and its validator class.
+- Shared test fixtures for ProblemDetails assertions in `SatelliteProvider.IntegrationTests`.
+- New contract artifact: `_docs/02_document/contracts/api/error-shape.md` v1.0.0 (the ProblemDetails shape every endpoint conforms to).
+
+### Included — Per-endpoint child tasks
+
+- One child Task per public-facing endpoint that has a JSON body. Each consumes the shared infra.
+- Each child uses the AC template below.
+- Parent-suite team enumerates the full endpoint surface from `/swagger/v1/swagger.json` / route map and creates the children.
+- First child (concrete reference implementation): **AZ-796** — inventory endpoint.
+
+### Excluded
+
+- Authentication / authorization changes (JWT contract owned by AZ-494).
+- Endpoint renaming (**AZ-794** owns the inventory body-field rename).
+- Rate-limiting / quota (separate concern).
+- Internal-only admin endpoints, health probes, metrics scrapers (parent-suite team owns in/out decision per endpoint).
+
+## Acceptance Criteria template (every child task must satisfy)
+
+**AC-1: Missing required field → 400**
+Given a POST body that omits a required field
+When the endpoint is called
+Then HTTP 400 with `errors.<field>` listing the missing field.
+
+**AC-2: Unknown field → 400**
+Given a POST body with an unrecognized field at root or in nested objects
+When the endpoint is called
+Then HTTP 400 with `errors[].<location>` naming the unexpected field.
+
+**AC-3: Wrong type → 400**
+Given a POST body with a field of unexpected JSON type (e.g. string where integer expected)
+When the endpoint is called
+Then HTTP 400 with `errors.<field>` describing the type mismatch.
+
+**AC-4: Out-of-range value → 400**
+Given a POST body with a value outside its supported range
+When the endpoint is called
+Then HTTP 400 with `errors.<field>` describing the valid range.
+
+**AC-5: Empty array where non-empty required → 400**
+Given a POST body where a required non-empty collection is empty
+When the endpoint is called
+Then HTTP 400 with `errors.<field>` describing the constraint.
+
+**AC-6: Validator class is its own file + unit-tested**
+A `IValidator<RequestDto>` (or equivalent) class exists in its own file under `SatelliteProvider.Api/Validators/` (or per-suite convention), with a unit test per `RuleFor(...)`.
+
+**AC-7: Integration tests cover one happy + one failure path per AC**
+`SatelliteProvider.IntegrationTests` adds a fixture that POSTs each bad-payload variant and asserts `status == 400` + ProblemDetails shape + specific `errors[].<location>` path.
+
+**AC-8: OpenAPI / Swagger spec accuracy**
+`/swagger/v1/swagger.json` marks required fields, declares ranges, and documents the new 400 response shape.
+
+## Test requirements
+
+- **Unit**: one xUnit class per validator. Tests cover each `RuleFor(...)` / equivalent.
+- **Integration**: `SatelliteProvider.IntegrationTests` adds one fixture per endpoint covering all AC variants (~7–10 new tests per endpoint).
+- **Contract**: OpenAPI spec snapshot test confirms the published schema rejects what the validator rejects.
+- **Cross-cutting**: shared `ProblemDetailsAssertions` helper in test infra so every endpoint's failure tests use the same assertion shape.
+
+## Migration / breaking-change strategy
+
+Tightening validation is a **breaking behavior change**: clients that today get 200 OK with nonsense will start getting 400. Three approaches the parent-suite team can pick from:
+
+1. **Hard switch** — ship in one release with a clear "Breaking" note. Cleanest for low-consumer-count (currently 1).
+2. **Soft warning then enforce** — log warnings for one release when malformed input arrives; enforce in the next.
+3. **API versioning** — keep `/v1` permissive, add `/v2` strict, migrate consumers, remove `/v1`.
+
+Recommendation: **#1** while the consumer set is small (currently 1 known: `gps-denied-onboard`).
+
+## Constraints
+
+- Shared infra MUST land before any per-endpoint child task — children are gated on it.
+- Coordinate with **AZ-794** (inventory rename) — recommended ordering ships AZ-794 first so this epic's validators use the final names from day one.
+- Parent-suite team enumerates the full consumer set before deciding rollout cadence (not just `gps-denied-onboard`).
+- Per-endpoint child tasks added by parent-suite team after enumerating endpoint surface from OpenAPI / route map. Do NOT create all children up-front — let them be added as the team decomposes.
+
+## References
+
+- Jira AZ-795: https://denyspopov.atlassian.net/browse/AZ-795
+- First child: AZ-796 (inventory endpoint)
+- Related: AZ-794 (inventory rename), AZ-777 (originating discovery in gps-denied-onboard)
+- Originating discovery: gps-denied-onboard AZ-777 Phase 1 Jetson probe (2026-05-22)
+- ASP.NET ProblemDetails reference: https://learn.microsoft.com/en-us/aspnet/core/web-api/handle-errors
+- FluentValidation reference: https://docs.fluentvalidation.net/

_docs/02_tasks/done/AZ-796_inventory_endpoint_validation.md

@@ -0,0 +1,124 @@
+# Strict validation for inventory endpoint (POST /api/satellite/tiles/inventory)
+
+**Task**: AZ-796_inventory_endpoint_validation
+**Name**: Strict validation for inventory endpoint
+**Description**: Add FluentValidation-backed strict input validation to `POST /api/satellite/tiles/inventory`. Reject malformed payloads with RFC 7807 ProblemDetails (HTTP 400). First concrete child of the validation-hardening epic (AZ-795); serves as reference implementation pattern for sibling per-endpoint tasks.
+**Complexity**: 3 points (recommended)
+**Dependencies**: AZ-795 (HARD — shared FluentValidation + ProblemDetails + unknown-field-rejection infra must land first); coordinate with AZ-794 (rename)
+**Component**: SatelliteProvider.Api/Validators + SatelliteProvider.Common (DTOs)
+**Tracker**: AZ-796 (https://denyspopov.atlassian.net/browse/AZ-796)
+**Epic**: AZ-795 — Strict input validation across all public endpoints
+**Originating ticket**: gps-denied-onboard AZ-777 Phase 1 (Jetson probe, 2026-05-22)
+
+## Origin
+
+Discovered during gps-denied-onboard AZ-777 Phase 1 Jetson probing on 2026-05-22 — see parent epic AZ-795 for full context. This ticket scopes the strict-validation work to the **inventory endpoint** as the first concrete reference implementation; sibling per-endpoint child tasks will follow the same pattern.
+
+Jira AZ-796 is the authoritative spec; this file mirrors the in-workspace-only sections that the satellite-provider implementer will need.
+
+## Problem
+
+`POST /api/satellite/tiles/inventory` today accepts malformed payloads silently:
+- Missing required fields (`z`, `x`, `y`) → silently coerced to `0`, producing `locationHash` collisions and `(0,0,0)` echoed back as if the client had asked for tile (0,0,0).
+- Unknown fields (typos like `{"Z":12}` uppercase) → silently dropped, then required field appears missing → silently 0.
+- Wrong types → silently coerced where possible.
+- No structured 4xx response. Real client bugs surface downstream as "all my inventory results have the same locationHash" — many hops from the actual cause.
+
+Concrete reproducer (from the originating probe):
+
+```bash
+curl -sk -H "Authorization: Bearer $JWT" -H "Content-Type: application/json" \
+  -d '{"tiles":[{"z":12,"x":2424,"y":1424},{"z":12,"x":2425,"y":1425}]}' \
+  https://satellite-provider:8080/api/satellite/tiles/inventory
+```
+
+Returns HTTP 200 with both `results` entries carrying `tileZoom:0, tileX:0, tileY:0` and identical `locationHash`. Expected: HTTP 400 naming `z`, `x`, `y` as unexpected fields (pre-AZ-794) or 200 with correct echo (post-AZ-794) — but never silently-wrong 200.
+
+## Outcome
+
+- `POST /api/satellite/tiles/inventory` rejects malformed payloads with HTTP 400 + RFC 7807 ProblemDetails matching the shape defined by the parent epic AZ-795.
+- An `IValidator<InventoryRequestDto>` (or equivalent) covers all 9 validation rules listed below.
+- Integration tests cover one happy path + one failure path per validation rule.
+- OpenAPI spec marks required fields, declares ranges, and documents the new 400 response.
+- Schema doc `_docs/02_document/contracts/api/tile-inventory.md` updated to reference the validation rules + error contract.
+
+## Scope
+
+### Included
+
+- `InventoryRequestValidator` (or equivalent class) in `SatelliteProvider.Api/Validators/` — full coverage of the 9 validation rules below.
+- Wiring of the validator into the MapPost / minimal-api endpoint registration in `SatelliteProvider.Api/Program.cs` (or wherever the inventory endpoint is wired today). Wiring leverages the shared infra from AZ-795.
+- Unit tests for the validator (`SatelliteProvider.UnitTests` or appropriate — one test method per `RuleFor(...)`).
+- Integration tests in `SatelliteProvider.IntegrationTests/TileInventoryValidationTests.cs` (new file) — happy + failure case per AC.
+- Update to `_docs/02_document/contracts/api/tile-inventory.md` documenting the validation rules + error shape.
+- Update to `/swagger/v1/swagger.json` (via XML doc comments / Swashbuckle annotations) marking required fields + ranges + 400 response.
+
+### Excluded
+
+- Shared infra wiring (parent epic AZ-795 owns this).
+- Validation for other endpoints (sibling child tasks under AZ-795 will be added by parent-suite team).
+- The field rename itself (AZ-794).
+- Auth / JWT changes.
+- Performance considerations (existing AZ-505 perf gates remain in effect; validation overhead expected to be negligible vs DB round-trip).
+
+## Required validations (9 rules)
+
+Naming below assumes AZ-794 (rename) has shipped. If validators land BEFORE AZ-794, swap `z/x/y` for `tileZoom/tileX/tileY` and re-rename when AZ-794 lands.
+
+1. **Body present** — null/empty body → 400.
+2. **`tiles` field required** — missing → 400 with `errors.tiles: ["required"]`.
+3. **`tiles` non-empty** — empty array → 400 with `errors.tiles: ["must contain at least 1 entry"]`.
+4. **`tiles` max size** — to be confirmed with parent-suite (existing AZ-505 spec uses 5000 for the EITHER/OR body shape; reaffirm here or align). Over the cap → 400.
+5. **Each entry has `z`, `x`, `y`** — any missing → 400 with `errors.tiles[i].<field>: ["required"]`.
+6. **Each field is non-negative integer** — wrong type or negative → 400.
+7. **`z` within supported zoom range** — out of range → 400 with `errors.tiles[i].z: ["must be between {min} and {max}"]`. Range to be confirmed with parent-suite (existing AZ-484 / AZ-503 schemas suggest 0–22; reaffirm here).
+8. **`x` / `y` within tile-axis bounds for given `z`** — i.e. `0 <= x,y < 2^z` — out of range → 400 with `errors.tiles[i].x` or `.y`.
+9. **Unknown fields at root or in tile entries** — 400 with `errors[].<location>: ["unexpected field: '<name>'"]`. Requires `JsonSerializerOptions.UnmappedMemberHandling.Disallow` (.NET 8+) at the deserializer level — this is part of AZ-795 shared infra and must be wired first.
+
+## Acceptance Criteria
+
+**AC-1: Each of the 9 validations rejects with HTTP 400 + ProblemDetails**
+Given a POST body that violates exactly ONE validation rule (one failure case per rule)
+When `POST /api/satellite/tiles/inventory` is called with valid JWT
+Then HTTP 400; response body matches the parent epic's ProblemDetails shape; `errors[].<location>` names the specific failing field; `errors[]` array does NOT include unrelated rules (single-rule precision).
+
+**AC-2: Happy path unchanged**
+Given a POST body that satisfies all 9 validations
+When `POST /api/satellite/tiles/inventory` is called with valid JWT
+Then HTTP 200 with the existing result shape (one entry per requested tile, same ordering, fields preserved from the pre-validation contract). No regression in existing `TileInventoryTests.cs` happy-path assertions.
+
+**AC-3: Validator class is its own file + unit-tested**
+A `InventoryRequestValidator` (or equivalent) class exists in its own file under `SatelliteProvider.Api/Validators/` (or per-suite convention). xUnit test class has one test method per `RuleFor(...)` — i.e. ≥ 9 unit-test methods.
+
+**AC-4: Integration tests cover happy + failure per rule**
+`SatelliteProvider.IntegrationTests/TileInventoryValidationTests.cs` (new file) has ≥ 10 test methods: 1 happy path + 9 failure cases. Each failure case POSTs the malformed payload, asserts `status == 400`, asserts ProblemDetails shape, asserts the specific `errors[].<location>` matches the rule.
+
+**AC-5: OpenAPI spec accuracy**
+Given `/swagger/v1/swagger.json` (or equivalent)
+When the InventoryRequest schema + endpoint operation are inspected
+Then required fields are marked `required: true`, integer types are declared with `minimum`/`maximum` per the validation rules, the endpoint declares a 400 response with the ProblemDetails schema.
+
+**AC-6: Schema doc updated**
+`_docs/02_document/contracts/api/tile-inventory.md` is updated (Change Log entry naming AZ-796) to document the validation rules + error contract. No version bump required (additive — error shape is a previously-undefined contract; clients that send valid payloads see no change).
+
+**AC-7: Manual probe captures each failure mode end-to-end**
+A `scripts/probe_inventory_validation.sh` (or Postman / Bruno collection) is committed that exercises each failure mode via real `curl` with a JWT, capturing the actual response body for documentation/regression.
+
+## Coordination with sibling tickets
+
+- **Parent (AZ-795)**: shared FluentValidation + ProblemDetails + unknown-field-rejection infra must land first.
+- **AZ-794 (inventory rename)**: if it ships first, validators use `z/x/y` from day one. If it ships in the same release, coordinate field names so this ticket lands once with the final names. If it ships later, validators initially use `tileZoom/tileX/tileY` and get renamed at AZ-794 ship time — less ideal but acceptable.
+
+## Constraints
+
+- **Breaking behavior change** — clients that today get 200 with nonsense will start getting 400. Coordinate rollout with all known consumers per AZ-795's migration strategy section.
+- **No regression in existing `TileInventoryTests.cs`** happy-path assertions (AZ-505 AC coverage).
+- **No change to internal repository / DB query path** — validation lives at the API layer only.
+
+## References
+
+- Jira AZ-796: https://denyspopov.atlassian.net/browse/AZ-796
+- Parent epic: AZ-795 (shared infra; error-shape contract)
+- Related: AZ-794 (rename), AZ-505 (existing inventory endpoint spec)
+- Originating discovery: gps-denied-onboard AZ-777 Phase 1 Jetson probe (2026-05-22)
+- Current contract doc: `_docs/02_document/contracts/api/tile-inventory.md` v1.0.0

_docs/_autodev_state.md

@@ -2,13 +2,13 @@
 
 ## Current Step
 flow: existing-code
-step: 9
+step: 10
-name: New Task
+name: Implement
 status: in_progress
 sub_step:
-  phase: 1
+  phase: 12
-  name: gather-feature-description
+  name: tracker-in-testing
-  detail: ""
+  detail: "batch 1 of 1; AZ-794 + AZ-795 + AZ-796 implementation complete; full Docker Compose suite green (311 unit tests + integration tests including 16 new inventory-validation cases); task files archived todo/ -> done/; ready to commit + push and transition Jira tickets to In Testing"
 retry_count: 0
 cycle: 7
 tracker: jira

docker-compose.yml

@@ -7,7 +7,7 @@ services:
       POSTGRES_PASSWORD: postgres
       POSTGRES_DB: satelliteprovider
     ports:
-      - "5432:5432"
+      - "5433:5432"
     volumes:
       - postgres_data:/var/lib/postgresql/data
     healthcheck:

scripts/probe_inventory_validation.sh

@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Manual end-to-end probe for the inventory endpoint's strict validation gate.
+# Each call below should return HTTP 400 with an `application/problem+json`
+# body whose `errors` map names the offending field path. Exactly one call
+# (the happy path) should return HTTP 200.
+#
+# Usage:
+#   API_URL=https://localhost:8080 JWT="<bearer-token>" ./scripts/probe_inventory_validation.sh
+#   (defaults to https://localhost:8080 with a JWT minted via PerfBootstrap --mint-only)
+
+API_URL="${API_URL:-https://localhost:8080}"
+JWT="${JWT:-}"
+PATH_INV="${API_URL%/}/api/satellite/tiles/inventory"
+
+if [[ -z "${JWT}" ]]; then
+    echo "ERROR: set JWT env var to a bearer token. Mint one via:"
+    echo "  dotnet run --project SatelliteProvider.IntegrationTests -- --mint-only"
+    exit 2
+fi
+
+curl_args=(-sS -k -H "Authorization: Bearer ${JWT}" -H "Content-Type: application/json" -X POST "${PATH_INV}")
+
+probe() {
+    local label="$1"
+    local body="$2"
+    local expected_status="$3"
+
+    echo "----- ${label} (expecting HTTP ${expected_status}) -----"
+    local response
+    response=$(curl "${curl_args[@]}" -d "${body}" -w "\nHTTP_STATUS=%{http_code}\n")
+    echo "${response}"
+    local actual_status
+    actual_status=$(echo "${response}" | tail -n 1 | sed 's/HTTP_STATUS=//')
+    if [[ "${actual_status}" != "${expected_status}" ]]; then
+        echo "FAIL: expected HTTP ${expected_status}, got ${actual_status}"
+        return 1
+    fi
+    echo "OK: HTTP ${expected_status}"
+    echo
+}
+
+probe "happy-path"             '{"tiles":[{"z":18,"x":1,"y":1}]}'                       200
+probe "missing-z"              '{"tiles":[{"x":1,"y":1}]}'                               400
+probe "missing-x-and-y"        '{"tiles":[{"z":18}]}'                                    400
+probe "zoom-out-of-range"      '{"tiles":[{"z":30,"x":0,"y":0}]}'                        400
+probe "x-beyond-zoom-bounds"   '{"tiles":[{"z":2,"x":4,"y":0}]}'                         400
+probe "y-beyond-zoom-bounds"   '{"tiles":[{"z":0,"x":0,"y":1}]}'                         400
+probe "negative-x"             '{"tiles":[{"z":18,"x":-1,"y":0}]}'                       400
+probe "unknown-root-field"     '{"unknownField":42,"tiles":[{"z":18,"x":1,"y":1}]}'      400
+probe "unknown-nested-field"   '{"tiles":[{"z":18,"x":1,"y":1,"foo":42}]}'               400
+probe "legacy-v1-field-name"   '{"tiles":[{"tileZoom":18,"tileX":1,"tileY":1}]}'         400
+probe "type-mismatch-string"   '{"tiles":[{"z":"eighteen","x":1,"y":1}]}'                400
+probe "both-populated-xor"     '{"tiles":[{"z":18,"x":1,"y":1}],"locationHashes":["00000000-0000-0000-0000-000000000000"]}' 400
+probe "neither-populated-xor"  '{}'                                                      400
+
+echo "All probes passed."