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feimacodefeimacode/open-design-agent-kit/.claude/skills/openspec-sync-specs/SKILL.md

openspec-sync-specs

Skill678 starsChanged yesterdayMITView on GitHub

Sync delta specs from a change to main specs. Use when the user wants to update main specs with changes from a delta spec, without archiving the change.

We split this skill into the rules it gives an agent

13 rules. 9 are common, 2 are distinctive, and 2 are very specific to this project.

  • 9

    Common

    Most of the 143 edited versions we read keep these.

  • 2

    Distinctive

    This author's own choices. Worth a look.

  • 2

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Very specific:

    Run openspec list --json to get available changes.

    line 22
  2. Distinctive:

    IMPORTANT: Do NOT guess or auto-select a change.

    line 26
  3. Very specific:

    Look for delta spec files in openspec/changes/<name>/specs/*/spec.md.

    line 30
  4. Common:

    If no delta specs found, inform user and stop.

    line 38
  5. Common:

    If requirement doesn't exist in main spec → add it

    line 51
  6. Common:

    If requirement already exists → update it to match (treat as implicit MODIFIED)

    line 52
  7. Common:

    Remove the entire requirement block from main spec

    line 63
  8. Distinctive:

    Add Purpose section (can be brief, mark as TBD)

    line 70
  9. Common:

    Add Requirements section with the ADDED requirements

    line 71
  10. Common:

    After applying all changes, summarize:

    line 75
  11. Common:

    Use your judgment to merge changes sensibly

    line 113
  12. Common:

    Read both delta and main specs before making changes

    line 134
  13. Common:

    If something is unclear, ask for clarification

    line 136

“Common” is measured: kept by at least 6 in 10 of the 143 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

Sync delta specs from a change to main specs.

This is an agent-driven operation - you will read delta specs and directly edit main specs to apply the changes. This allows intelligent merging (e.g., adding a scenario without copying the entire requirement).

Input: Optionally specify a change name. If omitted, check if it can be inferred from conversation context. If vague or ambiguous you MUST prompt for available changes.

Steps

  1. If no change name provided, prompt for selection

    Run openspec list --json to get available changes. Use the AskUserQuestion tool to let the user select.

    Show changes that have delta specs (under specs/ directory).

    IMPORTANT: Do NOT guess or auto-select a change. Always let the user choose.

  2. Find delta specs

    Look for delta spec files in openspec/changes/<name>/specs/*/spec.md.

    Each delta spec file contains sections like:

    • ## ADDED Requirements - New requirements to add
    • ## MODIFIED Requirements - Changes to existing requirements
    • ## REMOVED Requirements - Requirements to remove
    • ## RENAMED Requirements - Requirements to rename (FROM:/TO: format)

    If no delta specs found, inform user and stop.

  3. For each delta spec, apply changes to main specs

    For each capability with a delta spec at openspec/changes/<name>/specs/<capability>/spec.md:

    a. Read the delta spec to understand the intended changes

    b. Read the main spec at openspec/specs/<capability>/spec.md (may not exist yet)

    c. Apply changes intelligently:

    ADDED Requirements:

    • If requirement doesn't exist in main spec → add it
    • If requirement already exists → update it to match (treat as implicit MODIFIED)

    MODIFIED Requirements:

    • Find the requirement in main spec
    • Apply the changes - this can be:
      • Adding new scenarios (don't need to copy existing ones)
      • Modifying existing scenarios
      • Changing the requirement description
    • Preserve scenarios/content not mentioned in the delta

    REMOVED Requirements:

    • Remove the entire requirement block from main spec

    RENAMED Requirements:

    • Find the FROM requirement, rename to TO

    d. Create new main spec if capability doesn't exist yet:

    • Create openspec/specs/<capability>/spec.md
    • Add Purpose section (can be brief, mark as TBD)
    • Add Requirements section with the ADDED requirements

  4. Show summary

    After applying all changes, summarize:

    • Which capabilities were updated
    • What changes were made (requirements added/modified/removed/renamed)

Delta Spec Format Reference

## ADDED Requirements

### Requirement: New Feature
The system SHALL do something new.

#### Scenario: Basic case
- **WHEN** user does X
- **THEN** system does Y

## MODIFIED Requirements

### Requirement: Existing Feature
#### Scenario: New scenario to add
- **WHEN** user does A
- **THEN** system does B

## REMOVED Requirements

### Requirement: Deprecated Feature

## RENAMED Requirements

- FROM: `### Requirement: Old Name`
- TO: `### Requirement: New Name`

Key Principle: Intelligent Merging

Unlike programmatic merging, you can apply partial updates:

  • To add a scenario, just include that scenario under MODIFIED - don't copy existing scenarios
  • The delta represents intent, not a wholesale replacement
  • Use your judgment to merge changes sensibly

Output On Success

## Specs Synced: <change-name>

Updated main specs:

**<capability-1>**:
- Added requirement: "New Feature"
- Modified requirement: "Existing Feature" (added 1 scenario)

**<capability-2>**:
- Created new spec file
- Added requirement: "Another Feature"

Main specs are now updated. The change remains active - archive when implementation is complete.

Guardrails

  • Read both delta and main specs before making changes
  • Preserve existing content not mentioned in delta
  • If something is unclear, ask for clarification
  • Show what you're changing as you go
  • The operation should be idempotent - running twice should give same result

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