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<!-- OPENSPEC:START -->
# OpenSpec Instructions
These instructions are for AI assistants working in this project.
Always open `@/openspec/AGENTS.md` when the request:
- Mentions planning or proposals (words like proposal, spec, change, plan)
- Introduces new capabilities, breaking changes, architecture shifts, or big performance/security work
- Sounds ambiguous and you need the authoritative spec before coding
Use `@/openspec/AGENTS.md` to learn:
- How to create and apply change proposals
- Spec format and conventions
- Project structure and guidelines
Keep this managed block so 'openspec update' can refresh the instructions.
<!-- OPENSPEC:END -->

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# OpenSpec Instructions
Instructions for AI coding assistants using OpenSpec for spec-driven development.
## TL;DR Quick Checklist
- Search existing work: `openspec spec list --long`, `openspec list` (use `rg` only for full-text search)
- Decide scope: new capability vs modify existing capability
- Pick a unique `change-id`: kebab-case, verb-led (`add-`, `update-`, `remove-`, `refactor-`)
- Scaffold: `proposal.md`, `tasks.md`, `design.md` (only if needed), and delta specs per affected capability
- Write deltas: use `## ADDED|MODIFIED|REMOVED|RENAMED Requirements`; include at least one `#### Scenario:` per requirement
- Validate: `openspec validate [change-id] --strict` and fix issues
- Request approval: Do not start implementation until proposal is approved
## Three-Stage Workflow
### Stage 1: Creating Changes
Create proposal when you need to:
- Add features or functionality
- Make breaking changes (API, schema)
- Change architecture or patterns
- Optimize performance (changes behavior)
- Update security patterns
Triggers (examples):
- "Help me create a change proposal"
- "Help me plan a change"
- "Help me create a proposal"
- "I want to create a spec proposal"
- "I want to create a spec"
Loose matching guidance:
- Contains one of: `proposal`, `change`, `spec`
- With one of: `create`, `plan`, `make`, `start`, `help`
Skip proposal for:
- Bug fixes (restore intended behavior)
- Typos, formatting, comments
- Dependency updates (non-breaking)
- Configuration changes
- Tests for existing behavior
**Workflow**
1. Review `openspec/project.md`, `openspec list`, and `openspec list --specs` to understand current context.
2. Choose a unique verb-led `change-id` and scaffold `proposal.md`, `tasks.md`, optional `design.md`, and spec deltas under `openspec/changes/<id>/`.
3. Draft spec deltas using `## ADDED|MODIFIED|REMOVED Requirements` with at least one `#### Scenario:` per requirement.
4. Run `openspec validate <id> --strict` and resolve any issues before sharing the proposal.
### Stage 2: Implementing Changes
Track these steps as TODOs and complete them one by one.
1. **Read proposal.md** - Understand what's being built
2. **Read design.md** (if exists) - Review technical decisions
3. **Read tasks.md** - Get implementation checklist
4. **Implement tasks sequentially** - Complete in order
5. **Confirm completion** - Ensure every item in `tasks.md` is finished before updating statuses
6. **Update checklist** - After all work is done, set every task to `- [x]` so the list reflects reality
7. **Approval gate** - Do not start implementation until the proposal is reviewed and approved
### Stage 3: Archiving Changes
After deployment, create separate PR to:
- Move `changes/[name]/` → `changes/archive/YYYY-MM-DD-[name]/`
- Update `specs/` if capabilities changed
- Use `openspec archive <change-id> --skip-specs --yes` for tooling-only changes (always pass the change ID explicitly)
- Run `openspec validate --strict` to confirm the archived change passes checks
## Before Any Task
**Context Checklist:**
- [ ] Read relevant specs in `specs/[capability]/spec.md`
- [ ] Check pending changes in `changes/` for conflicts
- [ ] Read `openspec/project.md` for conventions
- [ ] Run `openspec list` to see active changes
- [ ] Run `openspec list --specs` to see existing capabilities
**Before Creating Specs:**
- Always check if capability already exists
- Prefer modifying existing specs over creating duplicates
- Use `openspec show [spec]` to review current state
- If request is ambiguous, ask 1–2 clarifying questions before scaffolding
### Search Guidance
- Enumerate specs: `openspec spec list --long` (or `--json` for scripts)
- Enumerate changes: `openspec list` (or `openspec change list --json` - deprecated but available)
- Show details:
- Spec: `openspec show <spec-id> --type spec` (use `--json` for filters)
- Change: `openspec show <change-id> --json --deltas-only`
- Full-text search (use ripgrep): `rg -n "Requirement:|Scenario:" openspec/specs`
## Quick Start
### CLI Commands
```bash
# Essential commands
openspec list # List active changes
openspec list --specs # List specifications
openspec show [item] # Display change or spec
openspec validate [item] # Validate changes or specs
openspec archive <change-id> [--yes|-y] # Archive after deployment (add --yes for non-interactive runs)
# Project management
openspec init [path] # Initialize OpenSpec
openspec update [path] # Update instruction files
# Interactive mode
openspec show # Prompts for selection
openspec validate # Bulk validation mode
# Debugging
openspec show [change] --json --deltas-only
openspec validate [change] --strict
```
### Command Flags
- `--json` - Machine-readable output
- `--type change|spec` - Disambiguate items
- `--strict` - Comprehensive validation
- `--no-interactive` - Disable prompts
- `--skip-specs` - Archive without spec updates
- `--yes`/`-y` - Skip confirmation prompts (non-interactive archive)
## Directory Structure
```
openspec/
├── project.md # Project conventions
├── specs/ # Current truth - what IS built
│ └── [capability]/ # Single focused capability
│ ├── spec.md # Requirements and scenarios
│ └── design.md # Technical patterns
├── changes/ # Proposals - what SHOULD change
│ ├── [change-name]/
│ │ ├── proposal.md # Why, what, impact
│ │ ├── tasks.md # Implementation checklist
│ │ ├── design.md # Technical decisions (optional; see criteria)
│ │ └── specs/ # Delta changes
│ │ └── [capability]/
│ │ └── spec.md # ADDED/MODIFIED/REMOVED
│ └── archive/ # Completed changes
```
## Creating Change Proposals
### Decision Tree
```
New request?
├─ Bug fix restoring spec behavior? → Fix directly
├─ Typo/format/comment? → Fix directly
├─ New feature/capability? → Create proposal
├─ Breaking change? → Create proposal
├─ Architecture change? → Create proposal
└─ Unclear? → Create proposal (safer)
```
### Proposal Structure
1. **Create directory:** `changes/[change-id]/` (kebab-case, verb-led, unique)
2. **Write proposal.md:**
```markdown
## Why
[1-2 sentences on problem/opportunity]
## What Changes
- [Bullet list of changes]
- [Mark breaking changes with **BREAKING**]
## Impact
- Affected specs: [list capabilities]
- Affected code: [key files/systems]
```
3. **Create spec deltas:** `specs/[capability]/spec.md`
```markdown
## ADDED Requirements
### Requirement: New Feature
The system SHALL provide...
#### Scenario: Success case
- **WHEN** user performs action
- **THEN** expected result
## MODIFIED Requirements
### Requirement: Existing Feature
[Complete modified requirement]
## REMOVED Requirements
### Requirement: Old Feature
**Reason**: [Why removing]
**Migration**: [How to handle]
```
If multiple capabilities are affected, create multiple delta files under `changes/[change-id]/specs/<capability>/spec.md`—one per capability.
4. **Create tasks.md:**
```markdown
## 1. Implementation
- [ ] 1.1 Create database schema
- [ ] 1.2 Implement API endpoint
- [ ] 1.3 Add frontend component
- [ ] 1.4 Write tests
```
5. **Create design.md when needed:**
Create `design.md` if any of the following apply; otherwise omit it:
- Cross-cutting change (multiple services/modules) or a new architectural pattern
- New external dependency or significant data model changes
- Security, performance, or migration complexity
- Ambiguity that benefits from technical decisions before coding
Minimal `design.md` skeleton:
```markdown
## Context
[Background, constraints, stakeholders]
## Goals / Non-Goals
- Goals: [...]
- Non-Goals: [...]
## Decisions
- Decision: [What and why]
- Alternatives considered: [Options + rationale]
## Risks / Trade-offs
- [Risk] → Mitigation
## Migration Plan
[Steps, rollback]
## Open Questions
- [...]
```
## Spec File Format
### Critical: Scenario Formatting
**CORRECT** (use #### headers):
```markdown
#### Scenario: User login success
- **WHEN** valid credentials provided
- **THEN** return JWT token
```
**WRONG** (don't use bullets or bold):
```markdown
- **Scenario: User login** ❌
**Scenario**: User login ❌
### Scenario: User login ❌
```
Every requirement MUST have at least one scenario.
### Requirement Wording
- Use SHALL/MUST for normative requirements (avoid should/may unless intentionally non-normative)
### Delta Operations
- `## ADDED Requirements` - New capabilities
- `## MODIFIED Requirements` - Changed behavior
- `## REMOVED Requirements` - Deprecated features
- `## RENAMED Requirements` - Name changes
Headers matched with `trim(header)` - whitespace ignored.
#### When to use ADDED vs MODIFIED
- ADDED: Introduces a new capability or sub-capability that can stand alone as a requirement. Prefer ADDED when the change is orthogonal (e.g., adding "Slash Command Configuration") rather than altering the semantics of an existing requirement.
- MODIFIED: Changes the behavior, scope, or acceptance criteria of an existing requirement. Always paste the full, updated requirement content (header + all scenarios). The archiver will replace the entire requirement with what you provide here; partial deltas will drop previous details.
- RENAMED: Use when only the name changes. If you also change behavior, use RENAMED (name) plus MODIFIED (content) referencing the new name.
Common pitfall: Using MODIFIED to add a new concern without including the previous text. This causes loss of detail at archive time. If you aren’t explicitly changing the existing requirement, add a new requirement under ADDED instead.
Authoring a MODIFIED requirement correctly:
1) Locate the existing requirement in `openspec/specs/<capability>/spec.md`.
2) Copy the entire requirement block (from `### Requirement: ...` through its scenarios).
3) Paste it under `## MODIFIED Requirements` and edit to reflect the new behavior.
4) Ensure the header text matches exactly (whitespace-insensitive) and keep at least one `#### Scenario:`.
Example for RENAMED:
```markdown
## RENAMED Requirements
- FROM: `### Requirement: Login`
- TO: `### Requirement: User Authentication`
```
## Troubleshooting
### Common Errors
**"Change must have at least one delta"**
- Check `changes/[name]/specs/` exists with .md files
- Verify files have operation prefixes (## ADDED Requirements)
**"Requirement must have at least one scenario"**
- Check scenarios use `#### Scenario:` format (4 hashtags)
- Don't use bullet points or bold for scenario headers
**Silent scenario parsing failures**
- Exact format required: `#### Scenario: Name`
- Debug with: `openspec show [change] --json --deltas-only`
### Validation Tips
```bash
# Always use strict mode for comprehensive checks
openspec validate [change] --strict
# Debug delta parsing
openspec show [change] --json | jq '.deltas'
# Check specific requirement
openspec show [spec] --json -r 1
```
## Happy Path Script
```bash
# 1) Explore current state
openspec spec list --long
openspec list
# Optional full-text search:
# rg -n "Requirement:|Scenario:" openspec/specs
# rg -n "^#|Requirement:" openspec/changes
# 2) Choose change id and scaffold
CHANGE=add-two-factor-auth
mkdir -p openspec/changes/$CHANGE/{specs/auth}
printf "## Why\n...\n\n## What Changes\n- ...\n\n## Impact\n- ...\n" > openspec/changes/$CHANGE/proposal.md
printf "## 1. Implementation\n- [ ] 1.1 ...\n" > openspec/changes/$CHANGE/tasks.md
# 3) Add deltas (example)
cat > openspec/changes/$CHANGE/specs/auth/spec.md << 'EOF'
## ADDED Requirements
### Requirement: Two-Factor Authentication
Users MUST provide a second factor during login.
#### Scenario: OTP required
- **WHEN** valid credentials are provided
- **THEN** an OTP challenge is required
EOF
# 4) Validate
openspec validate $CHANGE --strict
```
## Multi-Capability Example
```
openspec/changes/add-2fa-notify/
├── proposal.md
├── tasks.md
└── specs/
├── auth/
│ └── spec.md # ADDED: Two-Factor Authentication
└── notifications/
└── spec.md # ADDED: OTP email notification
```
auth/spec.md
```markdown
## ADDED Requirements
### Requirement: Two-Factor Authentication
...
```
notifications/spec.md
```markdown
## ADDED Requirements
### Requirement: OTP Email Notification
...
```
## Best Practices
### Simplicity First
- Default to <100 lines of new code
- Single-file implementations until proven insufficient
- Avoid frameworks without clear justification
- Choose boring, proven patterns
### Complexity Triggers
Only add complexity with:
- Performance data showing current solution too slow
- Concrete scale requirements (>1000 users, >100MB data)
- Multiple proven use cases requiring abstraction
### Clear References
- Use `file.ts:42` format for code locations
- Reference specs as `specs/auth/spec.md`
- Link related changes and PRs
### Capability Naming
- Use verb-noun: `user-auth`, `payment-capture`
- Single purpose per capability
- 10-minute understandability rule
- Split if description needs "AND"
### Change ID Naming
- Use kebab-case, short and descriptive: `add-two-factor-auth`
- Prefer verb-led prefixes: `add-`, `update-`, `remove-`, `refactor-`
- Ensure uniqueness; if taken, append `-2`, `-3`, etc.
## Tool Selection Guide
| Task | Tool | Why |
|------|------|-----|
| Find files by pattern | Glob | Fast pattern matching |
| Search code content | Grep | Optimized regex search |
| Read specific files | Read | Direct file access |
| Explore unknown scope | Task | Multi-step investigation |
## Error Recovery
### Change Conflicts
1. Run `openspec list` to see active changes
2. Check for overlapping specs
3. Coordinate with change owners
4. Consider combining proposals
### Validation Failures
1. Run with `--strict` flag
2. Check JSON output for details
3. Verify spec file format
4. Ensure scenarios properly formatted
### Missing Context
1. Read project.md first
2. Check related specs
3. Review recent archives
4. Ask for clarification
## Quick Reference
### Stage Indicators
- `changes/` - Proposed, not yet built
- `specs/` - Built and deployed
- `archive/` - Completed changes
### File Purposes
- `proposal.md` - Why and what
- `tasks.md` - Implementation steps
- `design.md` - Technical decisions
- `spec.md` - Requirements and behavior
### CLI Essentials
```bash
openspec list # What's in progress?
openspec show [item] # View details
openspec validate --strict # Is it correct?
openspec archive <change-id> [--yes|-y] # Mark complete (add --yes for automation)
```
Remember: Specs are truth. Changes are proposals. Keep them in sync.

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# Project Context
## Purpose
[Describe your project's purpose and goals]
## Tech Stack
- [List your primary technologies]
- [e.g., TypeScript, React, Node.js]
## Project Conventions
### Code Style
[Describe your code style preferences, formatting rules, and naming conventions]
### Architecture Patterns
[Document your architectural decisions and patterns]
### Testing Strategy
[Explain your testing approach and requirements]
### Git Workflow
[Describe your branching strategy and commit conventions]
## Domain Context
[Add domain-specific knowledge that AI assistants need to understand]
## Important Constraints
[List any technical, business, or regulatory constraints]
## External Dependencies
[Document key external services, APIs, or systems]