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The OpenSpec Convention defines how SDD artifacts are organized on the filesystem when using openspec persistence mode.

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Directory Structure

openspec/
├── config.yaml              ← Project-specific SDD config
├── specs/                   ← Source of truth (main specs)
│   └── {domain}/
│       └── spec.md
└── changes/                 ← Active changes
    ├── archive/             ← Completed changes (YYYY-MM-DD-{change-name}/)
    └── {change-name}/       ← Active change folder
        ├── exploration.md   ← (optional) from sdd-explore
        ├── proposal.md      ← from sdd-propose
        ├── specs/           ← from sdd-spec
        │   └── {domain}/
        │       └── spec.md  ← Delta spec
        ├── design.md        ← from sdd-design
        ├── tasks.md         ← from sdd-tasks (updated by sdd-apply)
        └── verify-report.md ← from sdd-verify

​
Artifact File Paths

SkillCreates / ReadsPath
sdd-initCreatesopenspec/config.yaml, openspec/specs/, openspec/changes/, openspec/changes/archive/
sdd-exploreCreates (optional)openspec/changes/{change-name}/exploration.md
sdd-proposeCreatesopenspec/changes/{change-name}/proposal.md
sdd-specCreatesopenspec/changes/{change-name}/specs/{domain}/spec.md
sdd-designCreatesopenspec/changes/{change-name}/design.md
sdd-tasksCreatesopenspec/changes/{change-name}/tasks.md
sdd-applyUpdatesopenspec/changes/{change-name}/tasks.md (marks [x])
sdd-verifyCreatesopenspec/changes/{change-name}/verify-report.md
sdd-archiveMovesopenspec/changes/{change-name}/ → openspec/changes/archive/YYYY-MM-DD-{change-name}/
sdd-archiveUpdatesopenspec/specs/{domain}/spec.md (merges deltas into main specs)

​
Reading Artifacts

Each skill reads its dependencies from the filesystem: 
Proposal:   openspec/changes/{change-name}/proposal.md
Specs:      openspec/changes/{change-name}/specs/  (all domain subdirectories)
Design:     openspec/changes/{change-name}/design.md
Tasks:      openspec/changes/{change-name}/tasks.md
Verify:     openspec/changes/{change-name}/verify-report.md
Config:     openspec/config.yaml
Main specs: openspec/specs/{domain}/spec.md

​
Writing Rules

  • ALWAYS create the change directory (openspec/changes/{change-name}/) before writing artifacts
  • If a file already exists, READ it first and UPDATE it (don’t overwrite blindly)
  • If the change directory already exists with artifacts, the change is being CONTINUED
  • Use the openspec/config.yaml rules section to apply project-specific constraints per phase

​
Config File Reference

# openspec/config.yaml
schema: spec-driven

context: |
  Tech stack: {detected}
  Architecture: {detected}
  Testing: {detected}
  Style: {detected}

rules:
  proposal:
    - Include rollback plan for risky changes
  specs:
    - Use Given/When/Then for scenarios
    - Use RFC 2119 keywords (MUST, SHALL, SHOULD, MAY)
  design:
    - Include sequence diagrams for complex flows
    - Document architecture decisions with rationale
  tasks:
    - Group by phase, use hierarchical numbering
    - Keep tasks completable in one session
  apply:
    - Follow existing code patterns
    tdd: false           # Set to true to enable RED-GREEN-REFACTOR
    test_command: ""     # e.g., "npm test", "pytest"
  verify:
    test_command: ""     # Override for verification
    build_command: ""    # Override for build check
    coverage_threshold: 0  # Set > 0 to enable coverage check
  archive:
    - Warn before merging destructive deltas

​
Config Fields

​
schema
string
required
Must be spec-driven
​
context
string
required
Project context detected by sdd-init. Includes tech stack, architecture, testing framework, and style conventions.
​
rules.proposal
array
Rules for the proposal phase (applied by sdd-propose)
​
rules.specs
array
Rules for the specs phase (applied by sdd-spec)
​
rules.design
array
Rules for the design phase (applied by sdd-design)
​
rules.tasks
array
Rules for the task planning phase (applied by sdd-tasks)
​
rules.apply.tdd
boolean
Enable TDD workflow in sdd-apply. When true, every task follows RED → GREEN → REFACTOR cycle.
​
rules.apply.test_command
string
Override test command for running tests during implementation (e.g., npm test, pytest, go test)
​
rules.verify.test_command
string
Override test command for verification phase. If not set, uses rules.apply.test_command or auto-detects.
​
rules.verify.build_command
string
Override build command for verification phase (e.g., npm run build, go build, python -m build)
​
rules.verify.coverage_threshold
number
Minimum coverage percentage required. If set to 0 (default), coverage check is skipped. Set to e.g. 80 to enforce 80% coverage.
​
rules.archive
array
Rules for the archive phase (applied by sdd-archive)

​
Archive Structure

When archiving, the change folder moves to: 
openspec/changes/archive/YYYY-MM-DD-{change-name}/
Use today’s date in ISO format. The archive is an AUDIT TRAIL — never delete or modify archived changes.

​
Example Archive

openspec/changes/archive/
├── 2026-02-15-add-dark-mode/
│   ├── proposal.md
│   ├── specs/
│   │   └── ui/
│   │       └── theme/
│   │           └── spec.md
│   ├── design.md
│   ├── tasks.md
│   └── verify-report.md
├── 2026-02-20-add-auth/
│   ├── exploration.md
│   ├── proposal.md
│   ├── specs/
│   ├── design.md
│   ├── tasks.md
│   └── verify-report.md
└── 2026-03-04-refactor-api/
    ├── proposal.md
    ├── specs/
    ├── design.md
    ├── tasks.md
    └── verify-report.md

​
Main Specs (Source of Truth)

The openspec/specs/ directory contains the current state of all specifications. These are updated by sdd-archive when a change is completed. 
openspec/specs/
├── auth/
│   └── spec.md          ← Full spec for authentication domain
├── payments/
│   └── spec.md          ← Full spec for payments domain
└── ui/
    ├── theme/
    │   └── spec.md      ← Full spec for theming
    └── navigation/
        └── spec.md      ← Full spec for navigation

​
Delta Specs vs Main Specs

  • Delta specs (openspec/changes/{change-name}/specs/) describe what’s changing
  • Main specs (openspec/specs/) describe current behavior
When a change is archived, delta specs are merged into main specs by sdd-archive.

​
Example: Change Lifecycle

​
1. Initialize

/sdd-init
# Creates:
# - openspec/config.yaml
# - openspec/specs/
# - openspec/changes/
# - openspec/changes/archive/

​
2. Create Change

/sdd-new add-dark-mode
# Creates:
# - openspec/changes/add-dark-mode/

​
3. Explore

# (part of /sdd-new)
# Creates:
# - openspec/changes/add-dark-mode/exploration.md

​
4. Propose

# (part of /sdd-new)
# Creates:
# - openspec/changes/add-dark-mode/proposal.md

​
5. Spec

# (part of /sdd-new)
# Creates:
# - openspec/changes/add-dark-mode/specs/ui/theme/spec.md

​
6. Design

# (part of /sdd-new)
# Creates:
# - openspec/changes/add-dark-mode/design.md

​
7. Tasks

# (part of /sdd-new)
# Creates:
# - openspec/changes/add-dark-mode/tasks.md

​
8. Apply

/sdd-apply
# Updates:
# - openspec/changes/add-dark-mode/tasks.md (marks tasks [x])

​
9. Verify

/sdd-verify
# Creates:
# - openspec/changes/add-dark-mode/verify-report.md

​
10. Archive

/sdd-archive add-dark-mode
# 1. Merges delta spec into main spec:
#    openspec/changes/add-dark-mode/specs/ui/theme/spec.md
#    → openspec/specs/ui/theme/spec.md
#
# 2. Moves change to archive:
#    openspec/changes/add-dark-mode/
#    → openspec/changes/archive/2026-03-04-add-dark-mode/

​
Git Integration

The openspec/ directory is designed to be committed to git: 
# Commit a new change proposal
git add openspec/changes/add-dark-mode/
git commit -m "Propose: Add dark mode support"

# Commit after implementation
git add openspec/changes/add-dark-mode/
git add src/  # implementation
git commit -m "Implement: Add dark mode"

# Commit after archiving
git add openspec/specs/ui/theme/spec.md
git add openspec/changes/archive/2026-03-04-add-dark-mode/
git rm -r openspec/changes/add-dark-mode/
git commit -m "Archive: Add dark mode"

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