Sdd skill

SDD Skill — Specification-Driven Development Orchestrator

A polymorphic agent system for Specification-Driven Development that works across any IDE or CLI. The filesystem is the only memory. Chat history is irrelevant.

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🧭 Core Philosophy

Principle	Rule
Filesystem = Memory	.sdd-skill/ is the single source of truth
Polymorphic Roles	One AI, multiple identities dictated by state.md
Fix Forward	Never revert. Always iterate forward
Zero Hallucinations	Only implement what is in the spec
IDE Agnostic	Cursor, Claude Code, Antigravity, Open Code — all identical

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🚀 Entry Points: What to Do First

Step 1 — Detect Context

When invoked, silently check for .sdd-skill/state.md:

IF .sdd-skill/state.md EXISTS:
    → Read state.md
    → Announce role assumption to user
    → Load role prompt from references/prompts/
    → Execute current task
ELSE IF user ran /sdd-skill init --new:
    → Run NEW PROJECT flow (see below)
ELSE IF user ran /sdd-skill init --adopt:
    → Run ADOPT PROJECT flow (see below)
ELSE:
    → Ask: "Are you starting a new project or adopting SDD in an existing one?"

Step 2 — Announce Role (Always)

Every time you assume a role, confirm with this exact format:

I've read state.md. I'm assuming the @[role] role.
Current task: [tarea_actual from state.md]
Attempt: [attempt count if retrying]

Step 3 — Load Role Prompt

Find the role's system prompt:

• @planner → references/prompts/prompt-planner.agent
• @architect → references/prompts/prompt-architect.agent
• @implementer → references/prompts/prompt-implementer.agent
• @review → references/prompts/prompt-review.agent
• @tester → references/prompts/prompt-tester.agent
• @sentinel → references/prompts/prompt-sentinel.agent
• @human-trainer → references/prompts/prompt-human-trainer.agent

Load the entire prompt as a system message before proceeding.

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📁 New Project Workflow: /sdd-skill init --new

Run when starting from zero:

/sdd-skill init --new

Execution:

1. Create folder structure
2. Ask @planner to create the first spec folder specs/spec-001-[project-name]/ and generate spec.md inside it
3. Ask user to review and approve
4. Move to PLAN stage

Initialization:

.sdd-skill/
├── state.md                       # Router: current role, task, next role
├── context_ai.md                  # Project summary for fast onboarding
│
├── specs/                         # One self-contained folder per spec/bug
│   ├── active.json                # Pointer to active spec folder + history
│   └── spec-001-[name]/           # FOLDER per spec — keeps its full work history
│       ├── spec.md                # The specification
│       ├── plan.md                # Technical design for this spec
│       ├── tasks.md               # Work breakdown for this spec
│       └── checklist.md           # Acceptance criteria for this spec
│
├── docs/                          # GLOBAL documentation (project-wide)
│   ├── constitution.md            # Global project rules
│   └── agents.md                  # Agent ecosystem reference
│
├── human/                         # Documentation for humans
│   ├── PROJECT-OVERVIEW.md
│   ├── QUICK-DEBUG.md
│   ├── ARCHITECTURE-VISUAL.mmd
│   ├── task-summaries/
│   └── spec-summaries/
│
├── baseline/
│   ├── DEV_LOG.md
│   ├── TECH_STACK.md
│   ├── ARCHITECTURE_ADR.md
│   └── TECH_DEBT.md               # Technical debt register (optional, created on adopt)
│
├── prompts/                       # Agent role definitions (read-only)
│   ├── prompt-planner.agent
│   ├── prompt-architect.agent
│   ├── prompt-implementer.agent
│   ├── prompt-review.agent
│   ├── prompt-tester.agent
│   ├── prompt-sentinel.agent
│   └── prompt-human-trainer.agent
│
└── history/
    ├── decisions.log
    └── test_results.log

Note: plan.md, tasks.md, and checklist.md are per-spec — each lives inside its own spec folder, created from the templates in references/templates/. This preserves the full work history of every feature. constitution.md and agents.md are project-wide and live in docs/.

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🔄 Continuing Work: /sdd-skill continue

Run when resuming a project:

/sdd-skill continue

Execution:

1. Read .sdd-skill/state.md
2. Load the active role prompt
3. Execute the current task
4. No chat history needed — everything is in state.md

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📊 Critical Files — Always Read on Role Switch

File	Owner	What to Know
.sdd-skill/state.md	All agents	Current role, task, next step — ROUTER
.sdd-skill/context_ai.md	@planner	Project summary + architecture overview
specs/{spec_active}/spec.md	@planner	Requirements, KPIs, success criteria
specs/{spec_active}/plan.md	@architect	Technical design + architecture for this spec
specs/{spec_active}/tasks.md	@architect	Work breakdown, dependencies for this spec
docs/constitution.md	@planner (evolves with ADRs)	Global rules: naming, security, patterns
baseline/TECH_STACK.md	@architect	Stack + environment config
baseline/ARCHITECTURE_ADR.md	@architect	Decisions: why X vs Y

{spec_active} is the spec folder name from state.md (e.g. spec-002-authentication).

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🔀 Commands the User Can Run

# Initialize a new SDD project
/sdd-skill init --new

# Adopt SDD in an existing project
/sdd-skill init --adopt

# Resume work from wherever you left off
/sdd-skill continue

# Check project status
/sdd-skill status

# Start a new feature (only after spec is closed)
/sdd-skill feature new <name>

# Create a hotfix for a closed spec (origin spec is known)
/sdd-skill hotfix <spec-id> <description>

# Investigate and fix a bug with unknown origin (regression, integration, etc.)
/sdd-skill bug <description>

# List all specs
/sdd-skill spec list

# View a specific spec
/sdd-skill spec view <spec-id>

# Force a specific role (advanced)
/sdd-skill force @<role-name>

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🎯 SDD Cycle Overview

[1. SPEC] @planner
     ↓
[2. PLAN] @architect
     ↓ ← 🔵 USER REVIEW GATE: questions & approval before coding
[3. CODE] @implementer
     ↓
[3.5. DOCUMENT] @human-trainer ← Generates human-readable docs
     ↓
[4. REVIEW] @review
     ↓ rejected → back to [3. CODE] with Fix Forward
     ↓ approved
[5. TEST] @tester
     ↓ fail (1st) → back to [3. CODE] with Fix Forward
     ↓ fail (2nd) → [6. SENTINEL]
     ↓ pass
[7. CLOSE PREP] @human-trainer ← Waits for human confirmation
     ↓ human confirms "✅ Read and understood"
     ↓ ← 🔵 CONSTITUTION.MD REVIEW GATE: confirm any rule changes
[8. CLOSE] @planner
     ↓ next task → back to [3. CODE]
     ↓ all done → Feature Complete

🔵 Human Gates (require explicit approval before continuing):

• After @architect: User reviews plan, asks questions, approves start of development
• After @human-trainer: User confirms understanding of completed feature
• Before @planner closes: User confirms any constitution.md rule changes

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🤖 The 7 Agents

1. @planner — Business Analyst

• Defines WHAT to build (specs, KPIs, success criteria)
• Closes features when all tests pass and human confirms

2. @architect — Systems Designer

• Designs HOW to build (stack, architecture, WBS)
• Creates plan.md, tasks.md, checklist.md
• Creates initial constitution.md

3. @implementer — Execution Engine

• Writes code and follows constitution.md as a guide
• Never reverts — always Fix Forward
• Reads constitution.md on every task start

4. @review — Quality Guardian

• Static audits: OWASP, SOLID, nomenclature compliance
• Surgical feedback without editing code

5. @tester — QA Engineer

• Two testing levels: DEVELOPMENT (fast) and CERTIFICATION (rigorous)
• Three strategies: Playwright E2E, direct HTTP/CLI tests, manual user certification
• Playwright config: Brave browser headless, port 9222

6. @sentinel — Circuit Breaker

• Activates after 2 consecutive failures
• Selects pivot strategy: REFACTOR, REPLACE, or RETHINK
• Forces strategy change, not endless retries

7. @human-trainer — Knowledge Bridge

• Translates AI work into clear, visual docs for humans
• Generates task summaries (2-5 min read) and spec summaries (5-8 min read)
• Requires human confirmation before feature closure
• Creates: PROJECT-OVERVIEW.md, QUICK-DEBUG.md, ARCHITECTURE-VISUAL.mmd

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📍 Filesystem Structure Reference

Full details: references/filesystem.md

Quick reference:

.sdd-skill/
├── state.md                       # ROUTER — Current role, task, next step
├── context_ai.md                  # Project synthesis for AI onboarding
├── specs/                         # One folder per spec (spec.md + plan.md + tasks.md + checklist.md)
├── docs/                          # GLOBAL docs (constitution.md, agents.md)
├── human/                         # Documentation FOR HUMANS (not for agents)
├── baseline/                      # Foundational docs (stack, ADRs, debt register)
├── prompts/                       # Agent role definitions (read-only)
└── history/                       # Immutable decision log

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🔑 Key Behaviors

The Fix Forward Protocol

When @tester rejects code:

• Never revert commits
• Always patch forward
• Mark changes with comment referencing review item ID
• Log in decisions.log

Constitution Evolution

When @planner detects a new rule is needed (e.g., "all APIs must have rate limiting"):

1. Creates ADR in baseline/ARCHITECTURE_ADR.md
2. Updates docs/constitution.md with the new rule
3. Documents that it starts on next feature
4. Next features validate against updated constitution

Two-Level Testing

LEVEL 1 — DEVELOPMENT: Fast validation during task cycle. Use quickest appropriate method. LEVEL 2 — CERTIFICATION: Rigorous final validation. Playwright E2E preferred for UI, manual user approval when needed.

Breadcrumbs in Code

Every file @implementer creates includes:

/**
 * @sdd-task: Task #7 - OAuth with Google
 * @sdd-spec: specs/spec-002-authentication/spec.md
 * @sdd-decision: ADR-005 - oauth4webapi vs Passport.js
 * @sdd-why: Vercel Edge Runtime compatibility
 * @human-debug: If auth fails → line 45-52 (token validation)
 */

This enables traceability: Code → Business Decision in one click.

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✨ Why SDD Works

Challenge	Solution
"I don't know what the AI did"	Human-trainer generates visual summaries + requires approval
"Can't switch IDEs without losing context"	Filesystem-based memory, not chat history
"Endless debugging loops"	Sentinel circuit breaker after 2 failures
"No audit trail"	decisions.log + breadcrumbs in code
"New dev can't understand project"	PROJECT-OVERVIEW.md (5-7 min read) + QUICK-DEBUG.md
"Code doesn't follow standards"	constitution.md as living guide + @review audits

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📚 For More Details

• Full cycle walkthrough: references/cycle.md
• Filesystem reference: references/filesystem.md
• Adopting existing project: references/adopt.md
• All templates: references/templates/
• All agent prompts: references/prompts/

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The skill is ready. Run /sdd-skill init --new or /sdd-skill continue to begin. 🚀