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The sdd-archive sub-agent completes the SDD cycle by merging delta specs into the main specs (source of truth), then moving the change folder to the archive.

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Metadata

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name
string
sdd-archive
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version
string
2.0
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author
string
gentleman-programming
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license
string
MIT

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When It’s Triggered

The orchestrator launches sdd-archive when:
  • User runs /sdd-archive <change-name>
  • Verification passed (no CRITICAL issues)
  • Change is ready to be closed

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What It Does

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Step 1: Sync Delta Specs to Main Specs

For each delta spec in openspec/changes/{change-name}/specs/:

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If Main Spec Exists

Reads the existing main spec and applies the delta: 
FOR EACH SECTION in delta spec:
├── ADDED Requirements → Append to main spec's Requirements section
├── MODIFIED Requirements → Replace the matching requirement in main spec
└── REMOVED Requirements → Delete the matching requirement from main spec
Merge carefully:
  • Match requirements by name (e.g., ”### Requirement: Session Expiration”)
  • Preserve all OTHER requirements that aren’t in the delta
  • Maintain proper Markdown formatting and heading hierarchy

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If Main Spec Does NOT Exist

The delta spec IS a full spec (not a delta). Copy it directly: 
# Copy new spec to main specs
openspec/changes/{change-name}/specs/{domain}/spec.md
  → openspec/specs/{domain}/spec.md

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Step 2: Move to Archive

Moves the entire change folder to archive with date prefix: 
openspec/changes/{change-name}/
  → openspec/changes/archive/YYYY-MM-DD-{change-name}/
Uses today’s date in ISO format (e.g., 2026-03-04).

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Step 3: Verify Archive

Confirms:
  • Main specs updated correctly
  • Change folder moved to archive
  • Archive contains all artifacts (proposal, specs, design, tasks, verify-report)
  • Active changes directory no longer has this change

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Step 4: Return Summary

Returns a result envelope with archive summary.

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Result Envelope Example

## Change Archived

**Change**: add-dark-mode
**Archived to**: openspec/changes/archive/2026-03-04-add-dark-mode/

### Specs Synced
| Domain | Action | Details |
|--------|--------|---------|
| ui/theme | Created | 2 added requirements, 0 modified, 0 removed |

### Archive Contents
- proposal.md ✅
- specs/ ✅
- design.md ✅
- tasks.md ✅ (19/19 tasks complete)
- verify-report.md ✅

### Source of Truth Updated
The following specs now reflect the new behavior:
- `openspec/specs/ui/theme/spec.md`

### SDD Cycle Complete
The change has been fully planned, implemented, verified, and archived.
Ready for the next change.

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Delta Merge Example

Before (openspec/specs/auth/spec.md): 
# Authentication Specification

## Requirements

### Requirement: User Login

The system MUST allow users to log in with email and password.

#### Scenario: Successful login
- GIVEN valid credentials
- WHEN user submits login form
- THEN user is authenticated
Delta (openspec/changes/add-2fa/specs/auth/spec.md): 
# Delta for Authentication

## ADDED Requirements

### Requirement: Two-Factor Authentication

The system SHOULD support optional two-factor authentication via TOTP.

#### Scenario: 2FA enabled login
- GIVEN user has 2FA enabled
- WHEN user submits login form with valid credentials
- THEN system prompts for TOTP code

## MODIFIED Requirements

### Requirement: User Login

The system MUST allow users to log in with email and password. If 2FA is enabled, a second authentication step is required.

(Previously: The system MUST allow users to log in with email and password.)
After Merge (openspec/specs/auth/spec.md): 
# Authentication Specification

## Requirements

### Requirement: User Login

The system MUST allow users to log in with email and password. If 2FA is enabled, a second authentication step is required.

#### Scenario: Successful login
- GIVEN valid credentials
- WHEN user submits login form
- THEN user is authenticated

### Requirement: Two-Factor Authentication

The system SHOULD support optional two-factor authentication via TOTP.

#### Scenario: 2FA enabled login
- GIVEN user has 2FA enabled
- WHEN user submits login form with valid credentials
- THEN system prompts for TOTP code

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Archive Structure

After archiving, the structure looks like: 
openspec/
├── config.yaml
├── specs/
│   └── ui/
│       └── theme/
│           └── spec.md          ← Updated with delta
└── changes/
    ├── archive/
    │   └── 2026-03-04-add-dark-mode/    ← Archived change
    │       ├── proposal.md
    │       ├── specs/
    │       │   └── ui/
    │       │       └── theme/
    │       │           └── spec.md       ← Delta (kept for audit trail)
    │       ├── design.md
    │       ├── tasks.md
    │       └── verify-report.md
    └── (other active changes)

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Rules

  • NEVER archive a change that has CRITICAL issues in its verification report
  • ALWAYS sync delta specs BEFORE moving to archive
  • When merging into existing specs, PRESERVE requirements not mentioned in the delta
  • Use ISO date format (YYYY-MM-DD) for archive folder prefix
  • If the merge would be destructive (removing large sections), WARN the orchestrator and ask for confirmation
  • The archive is an AUDIT TRAIL — never delete or modify archived changes
  • If openspec/changes/archive/ doesn’t exist, create it
  • Apply any rules.archive from openspec/config.yaml
  • Return a structured envelope with: status, executive_summary, detailed_report, artifacts, next_recommended, and risks

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Persistence Behavior

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OpenSpec Mode

  • Performs full merge and archive operations
  • Writes to openspec/specs/{domain}/spec.md
  • Moves folder to openspec/changes/archive/

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Engram Mode

  • Saves archive report with all artifact observation IDs for traceability
  • Topic key: sdd/{change-name}/archive-report
  • Includes links to all previous artifacts (explore, proposal, spec, design, tasks, verify-report)
  • Does NOT modify filesystem

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None Mode

  • Returns closure summary inline
  • Does NOT perform file operations

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