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name, description, category, tags, disable-model-invocation
name description category tags disable-model-invocation
decompose Decompose planned components into atomic implementable tasks with bootstrap structure plan. 4-step workflow: bootstrap structure plan, component task decomposition, blackbox test task decomposition, and cross-task verification. Supports full decomposition (_docs/ structure), single component mode, and tests-only mode. Trigger phrases: - "decompose", "decompose features", "feature decomposition" - "task decomposition", "break down components" - "prepare for implementation" - "decompose tests", "test decomposition" build
decomposition
tasks
dependencies
work-items
implementation-prep
true

Task Decomposition

Decompose planned components into atomic, implementable task specs with a bootstrap structure plan through a systematic workflow. All tasks are named with their work item tracker ID prefix in a flat directory.

Core Principles

  • Atomic tasks: each task does one thing; if it exceeds 8 complexity points, split it
  • Behavioral specs, not implementation plans: describe what the system should do, not how to build it
  • Flat structure: all tasks are tracker-ID-prefixed files in TASKS_DIR — no component subdirectories
  • Save immediately: write artifacts to disk after each task; never accumulate unsaved work
  • Tracker inline: create work item ticket immediately after writing each task file
  • Ask, don't assume: when requirements are ambiguous, ask the user before proceeding
  • Plan, don't code: this workflow produces documents and work item tickets, never implementation code

Context Resolution

Determine the operating mode based on invocation before any other logic runs.

Default (no explicit input file provided):

  • DOCUMENT_DIR: _docs/02_document/
  • TASKS_DIR: _docs/02_tasks/
  • TASKS_TODO: _docs/02_tasks/todo/
  • Reads from: _docs/00_problem/, _docs/01_solution/, DOCUMENT_DIR
  • Runs Step 1 (bootstrap) + Step 2 (all components) + Step 3 (blackbox tests) + Step 4 (cross-verification)

Single component mode (provided file is within _docs/02_document/ and inside a components/ subdirectory):

  • DOCUMENT_DIR: _docs/02_document/
  • TASKS_DIR: _docs/02_tasks/
  • TASKS_TODO: _docs/02_tasks/todo/
  • Derive component number and component name from the file path
  • Ask user for the parent Epic ID
  • Runs Step 2 (that component only, appending to existing task numbering)

Tests-only mode (provided file/directory is within tests/, or DOCUMENT_DIR/tests/ exists and input explicitly requests test decomposition):

  • DOCUMENT_DIR: _docs/02_document/
  • TASKS_DIR: _docs/02_tasks/
  • TASKS_TODO: _docs/02_tasks/todo/
  • TESTS_DIR: DOCUMENT_DIR/tests/
  • Reads from: _docs/00_problem/, _docs/01_solution/, TESTS_DIR
  • Runs Step 1t (test infrastructure bootstrap) + Step 3 (blackbox test decomposition) + Step 4 (cross-verification against test coverage)
  • Skips Step 1 (project bootstrap) and Step 2 (component decomposition) — the codebase already exists

Announce the detected mode and resolved paths to the user before proceeding.

Input Specification

Required Files

Default:

File Purpose
_docs/00_problem/problem.md Problem description and context
_docs/00_problem/restrictions.md Constraints and limitations
_docs/00_problem/acceptance_criteria.md Measurable acceptance criteria
_docs/01_solution/solution.md Finalized solution
DOCUMENT_DIR/architecture.md Architecture from plan skill
DOCUMENT_DIR/system-flows.md System flows from plan skill
DOCUMENT_DIR/components/[##]_[name]/description.md Component specs from plan skill
DOCUMENT_DIR/tests/ Blackbox test specs from plan skill

Single component mode:

File Purpose
The provided component description.md Component spec to decompose
Corresponding tests.md in the same directory (if available) Test specs for context

Tests-only mode:

File Purpose
TESTS_DIR/environment.md Test environment specification (Docker services, networks, volumes)
TESTS_DIR/test-data.md Test data management (seed data, mocks, isolation)
TESTS_DIR/blackbox-tests.md Blackbox functional scenarios (positive + negative)
TESTS_DIR/performance-tests.md Performance test scenarios
TESTS_DIR/resilience-tests.md Resilience test scenarios
TESTS_DIR/security-tests.md Security test scenarios
TESTS_DIR/resource-limit-tests.md Resource limit test scenarios
TESTS_DIR/traceability-matrix.md AC/restriction coverage mapping
_docs/00_problem/problem.md Problem context
_docs/00_problem/restrictions.md Constraints for test design
_docs/00_problem/acceptance_criteria.md Acceptance criteria being verified

Prerequisite Checks (BLOCKING)

Default:

  1. DOCUMENT_DIR contains architecture.md and components/ — STOP if missing
  2. Create TASKS_DIR and TASKS_TODO if they do not exist
  3. If TASKS_DIR subfolders (todo/, backlog/, done/) already contain task files, ask user: resume from last checkpoint or start fresh?

Single component mode:

  1. The provided component file exists and is non-empty — STOP if missing

Tests-only mode:

  1. TESTS_DIR/blackbox-tests.md exists and is non-empty — STOP if missing
  2. TESTS_DIR/environment.md exists — STOP if missing
  3. Create TASKS_DIR and TASKS_TODO if they do not exist
  4. If TASKS_DIR subfolders (todo/, backlog/, done/) already contain task files, ask user: resume from last checkpoint or start fresh?

Artifact Management

Directory Structure

TASKS_DIR/
├── _dependencies_table.md
├── todo/
│   ├── [TRACKER-ID]_initial_structure.md
│   ├── [TRACKER-ID]_[short_name].md
│   └── ...
├── backlog/
└── done/

Naming convention: Each task file is initially saved in TASKS_TODO/ with a temporary numeric prefix ([##]_[short_name].md). After creating the work item ticket, rename the file to use the work item ticket ID as prefix ([TRACKER-ID]_[short_name].md). For example: todo/01_initial_structure.md → todo/AZ-42_initial_structure.md.

Save Timing

Step Save immediately after Filename
Step 1 Bootstrap structure plan complete + work item ticket created + file renamed todo/[TRACKER-ID]_initial_structure.md
Step 1t Test infrastructure bootstrap complete + work item ticket created + file renamed todo/[TRACKER-ID]_test_infrastructure.md
Step 2 Each component task decomposed + work item ticket created + file renamed todo/[TRACKER-ID]_[short_name].md
Step 3 Each blackbox test task decomposed + work item ticket created + file renamed todo/[TRACKER-ID]_[short_name].md
Step 4 Cross-task verification complete _dependencies_table.md

Resumability

If TASKS_DIR subfolders already contain task files:

  1. List existing *_*.md files across todo/, backlog/, and done/ (excluding _dependencies_table.md) and count them
  2. Resume numbering from the next number (for temporary numeric prefix before tracker rename)
  3. Inform the user which tasks already exist and are being skipped

Progress Tracking

At the start of execution, create a TodoWrite with all applicable steps. Update status as each step/component completes.

Workflow

Step 1t: Test Infrastructure Bootstrap (tests-only mode only)

Role: Professional Quality Assurance Engineer Goal: Produce 01_test_infrastructure.md — the first task describing the test project scaffold Constraints: This is a plan document, not code. The /implement skill executes it.

  1. Read TESTS_DIR/environment.md and TESTS_DIR/test-data.md
  2. Read problem.md, restrictions.md, acceptance_criteria.md for domain context
  3. Document the test infrastructure plan using templates/test-infrastructure-task.md

The test infrastructure bootstrap must include:

  • Test project folder layout (e2e/ directory structure)
  • Mock/stub service definitions for each external dependency
  • docker-compose.test.yml structure from environment.md
  • Test runner configuration (framework, plugins, fixtures)
  • Test data fixture setup from test-data.md seed data sets
  • Test reporting configuration (format, output path)
  • Data isolation strategy

Self-verification:

  • Every external dependency from environment.md has a mock service defined
  • Docker Compose structure covers all services from environment.md
  • Test data fixtures cover all seed data sets from test-data.md
  • Test runner configuration matches the consumer app tech stack from environment.md
  • Data isolation strategy is defined

Save action: Write todo/01_test_infrastructure.md (temporary numeric name)

Tracker action: Create a work item ticket for this task under the "Blackbox Tests" epic. Write the work item ticket ID and Epic ID back into the task header.

Rename action: Rename the file from todo/01_test_infrastructure.md to todo/[TRACKER-ID]_test_infrastructure.md. Update the Task field inside the file to match the new filename.

BLOCKING: Present test infrastructure plan summary to user. Do NOT proceed until user confirms.

Step 1: Bootstrap Structure Plan (default mode only)

Role: Professional software architect Goal: Produce 01_initial_structure.md — the first task describing the project skeleton Constraints: This is a plan document, not code. The /implement skill executes it.

  1. Read architecture.md, all component specs, system-flows.md, data_model.md, and deployment/ from DOCUMENT_DIR
  2. Read problem, solution, and restrictions from _docs/00_problem/ and _docs/01_solution/
  3. Research best implementation patterns for the identified tech stack
  4. Document the structure plan using templates/initial-structure-task.md

The bootstrap structure plan must include:

  • Project folder layout with all component directories
  • Shared models, interfaces, and DTOs
  • Dockerfile per component (multi-stage, non-root, health checks, pinned base images)
  • docker-compose.yml for local development (all components + database + dependencies)
  • docker-compose.test.yml for blackbox test environment (blackbox test runner)
  • .dockerignore
  • CI/CD pipeline file (.github/workflows/ci.yml or azure-pipelines.yml) with stages from deployment/ci_cd_pipeline.md
  • Database migration setup and initial seed data scripts
  • Observability configuration: structured logging setup, health check endpoints (/health/live, /health/ready), metrics endpoint (/metrics)
  • Environment variable documentation (.env.example)
  • Test structure with unit and blackbox test locations

Self-verification:

  • All components have corresponding folders in the layout
  • All inter-component interfaces have DTOs defined
  • Dockerfile defined for each component
  • docker-compose.yml covers all components and dependencies
  • docker-compose.test.yml enables blackbox testing
  • CI/CD pipeline file defined with lint, test, security, build, deploy stages
  • Database migration setup included
  • Health check endpoints specified for each service
  • Structured logging configuration included
  • .env.example with all required environment variables
  • Environment strategy covers dev, staging, production
  • Test structure includes unit and blackbox test locations

Save action: Write todo/01_initial_structure.md (temporary numeric name)

Tracker action: Create a work item ticket for this task under the "Bootstrap & Initial Structure" epic. Write the work item ticket ID and Epic ID back into the task header.

Rename action: Rename the file from todo/01_initial_structure.md to todo/[TRACKER-ID]_initial_structure.md (e.g., todo/AZ-42_initial_structure.md). Update the Task field inside the file to match the new filename.

BLOCKING: Present structure plan summary to user. Do NOT proceed until user confirms.

Step 2: Task Decomposition (default and single component modes)

Role: Professional software architect Goal: Decompose each component into atomic, implementable task specs — numbered sequentially starting from 02 Constraints: Behavioral specs only — describe what, not how. No implementation code.

Numbering: Tasks are numbered sequentially across all components in dependency order. Start from 02 (01 is initial_structure). In single component mode, start from the next available number in TASKS_DIR.

Component ordering: Process components in dependency order — foundational components first (shared models, database), then components that depend on them.

For each component (or the single provided component):

  1. Read the component's description.md and tests.md (if available)
  2. Decompose into atomic tasks; create only 1 task if the component is simple or atomic
  3. Split into multiple tasks only when it is necessary and would be easier to implement
  4. Do not create tasks for other components — only tasks for the current component
  5. Each task should be atomic, containing 0 APIs or a list of semantically connected APIs
  6. Write each task spec using templates/task.md
  7. Estimate complexity per task (1, 2, 3, 5, 8 points); no task should exceed 8 points — split if it does
  8. Note task dependencies (referencing tracker IDs of already-created dependency tasks, e.g., AZ-42_initial_structure)
  9. Immediately after writing each task file: create a work item ticket, link it to the component's epic, write the work item ticket ID and Epic ID back into the task header, then rename the file from todo/[##]_[short_name].md to todo/[TRACKER-ID]_[short_name].md.

Self-verification (per component):

  • Every task is atomic (single concern)
  • No task exceeds 8 complexity points
  • Task dependencies reference correct tracker IDs
  • Tasks cover all interfaces defined in the component spec
  • No tasks duplicate work from other components
  • Every task has a work item ticket linked to the correct epic

Save action: Write each todo/[##]_[short_name].md (temporary numeric name), create work item ticket inline, then rename to todo/[TRACKER-ID]_[short_name].md. Update the Task field inside the file to match the new filename. Update Dependencies references in the file to use tracker IDs of the dependency tasks.

Step 3: Blackbox Test Task Decomposition (default and tests-only modes)

Role: Professional Quality Assurance Engineer Goal: Decompose blackbox test specs into atomic, implementable task specs Constraints: Behavioral specs only — describe what, not how. No test code.

Numbering:

  • In default mode: continue sequential numbering from where Step 2 left off.
  • In tests-only mode: start from 02 (01 is the test infrastructure bootstrap from Step 1t).
  1. Read all test specs from DOCUMENT_DIR/tests/ (blackbox-tests.md, performance-tests.md, resilience-tests.md, security-tests.md, resource-limit-tests.md)
  2. Group related test scenarios into atomic tasks (e.g., one task per test category or per component under test)
  3. Each task should reference the specific test scenarios it implements and the environment/test-data specs
  4. Dependencies:
    • In default mode: blackbox test tasks depend on the component implementation tasks they exercise
    • In tests-only mode: blackbox test tasks depend on the test infrastructure bootstrap task (Step 1t)
  5. Write each task spec using templates/task.md
  6. Estimate complexity per task (1, 2, 3, 5, 8 points); no task should exceed 8 points — split if it does
  7. Note task dependencies (referencing tracker IDs of already-created dependency tasks)
  8. Immediately after writing each task file: create a work item ticket under the "Blackbox Tests" epic, write the work item ticket ID and Epic ID back into the task header, then rename the file from todo/[##]_[short_name].md to todo/[TRACKER-ID]_[short_name].md.

Self-verification:

  • Every scenario from tests/blackbox-tests.md is covered by a task
  • Every scenario from tests/performance-tests.md, tests/resilience-tests.md, tests/security-tests.md, and tests/resource-limit-tests.md is covered by a task
  • No task exceeds 8 complexity points
  • Dependencies correctly reference the dependency tasks (component tasks in default mode, test infrastructure in tests-only mode)
  • Every task has a work item ticket linked to the "Blackbox Tests" epic

Save action: Write each todo/[##]_[short_name].md (temporary numeric name), create work item ticket inline, then rename to todo/[TRACKER-ID]_[short_name].md.

Step 4: Cross-Task Verification (default and tests-only modes)

Role: Professional software architect and analyst Goal: Verify task consistency and produce _dependencies_table.md Constraints: Review step — fix gaps found, do not add new tasks

  1. Verify task dependencies across all tasks are consistent
  2. Check no gaps:
    • In default mode: every interface in architecture.md has tasks covering it
    • In tests-only mode: every test scenario in traceability-matrix.md is covered by a task
  3. Check no overlaps: tasks don't duplicate work
  4. Check no circular dependencies in the task graph
  5. Produce _dependencies_table.md using templates/dependencies-table.md

Self-verification:

Default mode:

  • Every architecture interface is covered by at least one task
  • No circular dependencies in the task graph
  • Cross-component dependencies are explicitly noted in affected task specs
  • _dependencies_table.md contains every task with correct dependencies

Tests-only mode:

  • Every test scenario from traceability-matrix.md "Covered" entries has a corresponding task
  • No circular dependencies in the task graph
  • Test task dependencies reference the test infrastructure bootstrap
  • _dependencies_table.md contains every task with correct dependencies

Save action: Write _dependencies_table.md

BLOCKING: Present dependency summary to user. Do NOT proceed until user confirms.

Common Mistakes

  • Coding during decomposition: this workflow produces specs, never code
  • Over-splitting: don't create many tasks if the component is simple — 1 task is fine
  • Tasks exceeding 8 points: split them; no task should be too complex for a single implementer
  • Cross-component tasks: each task belongs to exactly one component
  • Skipping BLOCKING gates: never proceed past a BLOCKING marker without user confirmation
  • Creating git branches: branch creation is an implementation concern, not a decomposition one
  • Creating component subdirectories: all tasks go flat in TASKS_TODO/
  • Forgetting tracker: every task must have a work item ticket created inline — do not defer to a separate step
  • Forgetting to rename: after work item ticket creation, always rename the file from numeric prefix to tracker ID prefix

Escalation Rules

Situation Action
Ambiguous component boundaries ASK user
Task complexity exceeds 8 points after splitting ASK user
Missing component specs in DOCUMENT_DIR ASK user
Cross-component dependency conflict ASK user
Tracker epic not found for a component ASK user for Epic ID
Task naming PROCEED, confirm at next BLOCKING gate

Methodology Quick Reference

┌────────────────────────────────────────────────────────────────┐
│          Task Decomposition (Multi-Mode)                        │
├────────────────────────────────────────────────────────────────┤
│ CONTEXT: Resolve mode (default / single component / tests-only)│
│                                                                │
│ DEFAULT MODE:                                                   │
│  1.  Bootstrap Structure  → [TRACKER-ID]_initial_structure.md     │
│      [BLOCKING: user confirms structure]                       │
│  2.  Component Tasks      → [TRACKER-ID]_[short_name].md each    │
│  3.  Blackbox Tests       → [TRACKER-ID]_[short_name].md each    │
│  4.  Cross-Verification   → _dependencies_table.md            │
│      [BLOCKING: user confirms dependencies]                    │
│                                                                │
│ TESTS-ONLY MODE:                                                │
│  1t. Test Infrastructure  → [TRACKER-ID]_test_infrastructure.md   │
│      [BLOCKING: user confirms test scaffold]                   │
│  3.  Blackbox Tests       → [TRACKER-ID]_[short_name].md each    │
│  4.  Cross-Verification   → _dependencies_table.md            │
│      [BLOCKING: user confirms dependencies]                    │
│                                                                │
│ SINGLE COMPONENT MODE:                                          │
│  2.  Component Tasks      → [TRACKER-ID]_[short_name].md each    │
├────────────────────────────────────────────────────────────────┤
│ Principles: Atomic tasks · Behavioral specs · Flat structure   │
│   Tracker inline · Rename to tracker ID · Save now · Ask don't assume│
└────────────────────────────────────────────────────────────────┘
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