Spec-Kit Implement

Execute the implementation plan by processing and executing all tasks defined in tasks.md.

User Input

$ARGUMENTS

You MUST consider the user input before proceeding (if not empty).

Constitution Loading (REQUIRED)

Before ANY action, load and internalize the project constitution:

1. Read constitution:

   bashCopy

   cat .specify/memory/constitution.md 2>/dev/null || echo "NO_CONSTITUTION"
   

2. If file doesn't exist:

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   ERROR: Project constitution not found at .specify/memory/constitution.md
   
   STOP - Cannot proceed without constitution.
   Run /speckit-00-constitution first to define project principles.
   

3. Parse all principles, constraints, and governance rules.

4. Extract Enforcement Rules:

   • Find all lines containing "MUST", "MUST NOT", "SHALL", "SHALL NOT", "REQUIRED", "NON-NEGOTIABLE"
   • Build enforcement checklist:
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     CONSTITUTION ENFORCEMENT RULES:
     [MUST] ...
     [MUST NOT] ...
     [REQUIRED] ...
     

   • These rules will be checked BEFORE EVERY FILE WRITE

5. Validation commitment: Before writing ANY file, validate against each principle.

6. Hard Gate Declaration: State explicitly:

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   ╭─────────────────────────────────────────────────────╮
   │  CONSTITUTION ENFORCEMENT GATE ACTIVE               │
   ├─────────────────────────────────────────────────────┤
   │  Extracted: X enforcement rules                     │
   │  Mode: STRICT - violations HALT implementation      │
   │  Checked: Before EVERY file write                   │
   ╰─────────────────────────────────────────────────────╯
   

Prerequisites Check

1. Run prerequisites check (choose based on platform):

   Unix/macOS/Linux:

   bashCopy

   .specify/scripts/bash/check-prerequisites.sh --json --require-tasks --include-tasks
   

   Windows (PowerShell):

   powershellCopy

   pwsh .specify/scripts/powershell/check-prerequisites.ps1 -Json -RequireTasks -IncludeTasks
   

2. Parse JSON for FEATURE_DIR and AVAILABLE_DOCS.

3. If error or missing tasks.md:

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   ERROR: tasks.md not found in feature directory.
   Run /speckit-05-tasks first to create the task list.
   

Comprehensive Pre-Implementation Validation

BEFORE any implementation, perform complete validation sweep:

1. Artifact Completeness Check

Verify all required artifacts exist and are complete:

2. Cross-Artifact Consistency Check

Validate relationships between artifacts:

1. Spec → Tasks Traceability:

   • Every FR-XXX requirement should have corresponding task(s)
   • Every user story should have a task phase
   • Report: "Coverage: X/Y requirements have tasks (Z%)"

2. Plan → Tasks Alignment:

   • Tech stack in plan matches task file paths (e.g., Python → .py files)
   • Project structure matches task paths
   • WARN if mismatch: "Plan says Python but tasks create .js files"

3. Constitution → Plan Compliance:

   • Re-verify no constitution violations in plan
   • Extract MUST/MUST NOT rules and validate

3. Implementation Readiness Score

╭─────────────────────────────────────────────────────╮
│  IMPLEMENTATION READINESS                            │
├─────────────────────────────────────────────────────┤
│  Artifacts:        X/Y complete              [✓/✗]  │
│  Spec Coverage:    X% requirements → tasks   [✓/✗]  │
│  Plan Alignment:   [Aligned/X mismatches]    [✓/✗]  │
│  Constitution:     [Compliant/X violations]  [✓/✗]  │
│  Checklists:       X/Y at 100%               [✓/✗]  │
│  Dependencies:     [Valid/Circular detected] [✓/✗]  │
├─────────────────────────────────────────────────────┤
│  OVERALL READINESS: [READY/BLOCKED]                 │
│  Blocking Issues: [None/List issues]                │
╰─────────────────────────────────────────────────────╯

If BLOCKED: List all blocking issues and required actions If READY: Proceed to Checklist Gating

Checklist Gating (CRITICAL)

Before implementation begins, check checklists status.

Use this approach (do NOT write custom bash for counting):

1. Read each checklist file in FEATURE_DIR/checklists/ using the Read tool
2. Count manually by scanning the content:
   • Incomplete: lines starting with - [ ]
   • Complete: lines starting with - [x] or - [X]
3. Build status table from the counts

Example output:

Decision logic:

• PASS: All checklists have 0 incomplete items → proceed automatically
• FAIL: Any checklist has incomplete items → ask user:
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  Some checklists are incomplete. Do you want to proceed with implementation anyway? (yes/no)
  

  • If "no"/"wait"/"stop": halt execution
  • If "yes"/"proceed"/"continue": proceed to next step

Execution Flow

1. Load Implementation Context

• REQUIRED: Read tasks.md for complete task list and execution plan
• REQUIRED: Read plan.md for tech stack, architecture, and file structure
• IF EXISTS: Read data-model.md for entities and relationships
• IF EXISTS: Read contracts/ for API specifications
• IF EXISTS: Read research.md for technical decisions
• IF EXISTS: Read quickstart.md for integration scenarios

2. Tessl Initialization (Optional but Recommended)

Initialize Tessl and install tiles for the planned tech stack BEFORE any implementation begins.

Why Tessl: AI agents often drift, misuse APIs, or fall back on outdated patterns when working with libraries. Tessl provides 10,000+ "tiles" of agent-optimized documentation that keeps implementation aligned with current best practices and prevents spinning on obscure library usage.

1. Check if Tessl is available:

   bashCopy

   command -v tessl >/dev/null 2>&1 && echo "TESSL_AVAILABLE" || echo "TESSL_NOT_FOUND"
   

2. If Tessl is NOT available, display a gentle recommendation:

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   ╭──────────────────────────────────────────────────────────────────╮
   │  Tessl not detected                                              │
   │                                                                  │
   │  Tessl helps AI agents write better code by providing accurate, │
   │  up-to-date documentation for libraries and frameworks.         │
   │                                                                  │
   │  Without Tessl, I may:                                          │
   │  • Use outdated API patterns                                    │
   │  • Miss library-specific conventions                            │
   │  • Spin on obscure library features                             │
   │                                                                  │
   │  Learn more: https://tessl.io                                   │
   │  Quick install: npm install -g tessl                            │
   ╰──────────────────────────────────────────────────────────────────╯
   

   Then proceed without Tessl.

3. If Tessl IS available, initialize and install tiles from plan.md:

   a. Initialize Tessl:

   bashCopy

   tessl init --agent claude-code
   

   b. Extract technologies from plan.md Technical Context section:

   • Language/Version (e.g., Python, Node.js, TypeScript)
   • Primary Dependencies (e.g., Click, Express, React)
   • Storage (e.g., SQLite, PostgreSQL, MongoDB)
   • Testing (e.g., pytest, Jest, Vitest)
   • Any other frameworks/libraries mentioned

   c. For each technology, search for available tiles and install:

   bashCopy

   # Search for tile
   tessl search <technology>
   
   # If tile found, install it
   tessl install tessl/<tile-name>
   

   Example for Python + Click + SQLite + pytest stack:

   bashCopy

   tessl search python      # → install tessl/python if found
   tessl search click       # → install tessl/click if found
   tessl search sqlite      # → install tessl/sqlite3 if found
   tessl search pytest      # → install tessl/pytest if found
   

   d. Report installed tiles:

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   Tessl initialized with tiles:
   ✓ tessl/python
   ✓ tessl/click
   ✓ tessl/sqlite3
   ✓ tessl/pytest
   ✗ tessl/somelib (not found in registry)
   
   Library documentation now available via MCP.
   

4. Using Tessl during implementation (IMPORTANT):

   After tiles are installed, actively use the Tessl MCP tool to get library documentation when implementing features:

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   mcp__tessl__get_library_docs(library="click", topic="commands")
   mcp__tessl__get_library_docs(library="sqlite3", topic="connections")
   mcp__tessl__get_library_docs(library="pytest", topic="fixtures")
   

   When to query Tessl:

   • Before using any API from an installed tile's library
   • When unsure about correct patterns or conventions
   • When implementing non-trivial features with the library
   • When encountering errors related to library usage

   Query pattern:

   • Be specific with the topic parameter (e.g., "decorators", "async", "error handling")
   • Query once per distinct feature/pattern, cache mentally for the session
   • If no useful result, proceed with best knowledge

Skip if: User passes --no-tessl flag.

3. Project Setup Verification

Create/verify ignore files based on actual project setup:

Detection & Creation Logic:

• Check if git repo: git rev-parse --git-dir 2>/dev/null -> create/verify .gitignore
• Check if Dockerfile exists or Docker in plan.md -> create/verify .dockerignore
• Check if .eslintrc* exists -> create/verify .eslintignore
• Check if eslint.config.* exists -> ensure config's ignores entries cover required patterns
• Check if .prettierrc* exists -> create/verify .prettierignore
• Check if .npmrc or package.json exists -> create/verify .npmignore (if publishing)
• Check if terraform files (*.tf) exist -> create/verify .terraformignore
• Check if helm charts present -> create/verify .helmignore

Common Patterns by Technology (from plan.md tech stack):

• Node.js/JavaScript/TypeScript: node_modules/, dist/, build/, *.log, .env*
• Python: __pycache__/, *.pyc, .venv/, venv/, dist/, *.egg-info/
• Java: target/, *.class, *.jar, .gradle/, build/
• C#/.NET: bin/, obj/, *.user, *.suo, packages/
• Go: *.exe, *.test, vendor/, *.out
• Rust: target/, debug/, release/, *.rs.bk
• Universal: .DS_Store, Thumbs.db, *.tmp, *.swp, .vscode/, .idea/

4. Parse tasks.md

Extract:

• Task phases: Setup, Tests, Core, Integration, Polish
• Task dependencies: Sequential vs parallel execution rules
• Task details: ID, description, file paths, parallel markers [P]
• Execution flow: Order and dependency requirements

5. Execute Implementation

Phase-by-phase execution:

• Complete each phase before moving to the next
• Respect dependencies: Run sequential tasks in order
• Parallel tasks [P] can run together (different files, no dependencies)
• Follow TDD approach: Execute test tasks before implementation tasks
• Validation checkpoints: Verify each phase completion before proceeding

5.1 Phase 1: Setup

Execute Setup phase tasks:

• Initialize project structure
• Create configuration files (package.json, pyproject.toml, etc.)
• Install dependencies (npm install, pip install, etc.)

Note: Tessl was already initialized in step 2 with tiles for the planned tech stack.

5.2 Remaining Phases

Continue with remaining phases:

• Phase 2: Foundational - blocking prerequisites
• Phase 3+: User Stories - in priority order (P1, P2, P3...)
• Final Phase: Polish - cross-cutting concerns

Implementation execution rules:

• Tests before code: If tests requested, write them first and verify they fail
• Core development: Implement models, services, CLI commands, endpoints
• Integration work: Database connections, middleware, logging, external services
• Polish and validation: Unit tests, performance optimization, documentation

6. Output Validation (REQUIRED)

Before writing ANY file:

1. Review output against EACH constitutional principle
2. If ANY violation detected:
   • STOP immediately
   • State: "CONSTITUTION VIOLATION: [Principle Name]"
   • Explain: What specifically violates the principle
   • Suggest: Compliant alternative approach
   • DO NOT proceed with "best effort" or workarounds
3. If compliant, proceed with file write

7. Progress Tracking

• Report progress after each completed task
• Halt execution if any non-parallel task fails
• For parallel tasks [P], continue with successful tasks, report failed ones
• Provide clear error messages with context for debugging
• Suggest next steps if implementation cannot proceed
• IMPORTANT: For completed tasks, mark the task as [X] in the tasks file

8. Completion Validation

• Verify all required tasks are completed
• Check that implemented features match the original specification
• Validate that tests pass and coverage meets requirements
• Confirm the implementation follows the technical plan
• Report final status with summary of completed work

Error Handling

Next Steps

After implementation:

1. Required: Run tests to verify functionality
2. Required: Commit and push changes
3. Optional: Run /speckit-05-taskstoissues to create GitHub Issues
   • Exports remaining tasks to GitHub for project tracking
   • Useful for team collaboration and sprint planning
   • Creates issues with labels, assignments, and cross-references

Suggest to user:

Implementation complete! Next steps:
- Run tests to verify functionality
- Commit and push changes
- /speckit-05-taskstoissues - (Optional) Export remaining tasks to GitHub Issues