open-spec-apply

Implement tasks from a working change.

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. Select the change

   If a name is provided, use it. Otherwise:

   • Infer from conversation context if the user mentioned a change
   • Auto-select if only one directory exists under specs/changes/
   • If ambiguous, inspect available directories under specs/changes/ and ask the user to choose

   Always announce: "Using change: " and how to override (e.g., open-spec-apply <other>).

2. Read the change artifacts

   Read the files that exist under specs/changes/<name>/:

   • proposal.md
   • design.md
   • tasks.md

   If tasks.md is missing, pause and ask whether to create it first with the open-spec-propose skill.

3. Show current progress

   Display:

   • Change being used
   • Progress: "N/M tasks complete"
   • Remaining tasks overview

4. Implement tasks (loop until done or blocked)

   For each pending task:

   • Show which task is being worked on
   • Make the code changes required
   • Keep changes minimal and focused
   • Mark task complete in the tasks file: - [ ] → - [x]
   • Continue to next task

   Pause if:

   • Task is unclear → ask for clarification
   • Implementation reveals a design issue → suggest updating artifacts
   • Error or blocker encountered → report and wait for guidance
   • User interrupts

5. On completion or pause, show status

   Display:

   • Tasks completed this session
   • Overall progress: "N/M tasks complete"
   • If all done: suggest using the open-spec-complete skill to sync specs/features/
   • If paused: explain why and wait for guidance

Output During Implementation

## Implementing: <change-name>

Working on task 3/7: <task description>
[...implementation happening...]
✓ Task complete

Working on task 4/7: <task description>
[...implementation happening...]
✓ Task complete

Output On Completion

## Implementation Complete

**Change:** <change-name>
**Progress:** 7/7 tasks complete ✓

### Completed This Session
- [x] Task 1
- [x] Task 2
...

All tasks complete! Use the `open-spec-complete` skill to sync `specs/features/` and clean up workflow artifacts.

Output On Pause (Issue Encountered)

## Implementation Paused

**Change:** <change-name>
**Progress:** 4/7 tasks complete

### Issue Encountered
<description of the issue>

**Options:**
1. <option 1>
2. <option 2>
3. Other approach

What would you like to do?

Guardrails

• Keep going through tasks until done or blocked
• Always read the available change artifacts before starting
• If task is ambiguous, pause and ask before implementing
• If implementation reveals issues, pause and suggest artifact updates
• Keep code changes minimal and scoped to each task
• Update task checkbox immediately after completing each task
• Pause on errors, blockers, or unclear requirements - don't guess
• Treat specs/changes/ as working state only; completion still requires syncing specs/features/

Fluid Workflow Integration

This skill supports the "actions on a change" model:

• Can be invoked anytime: Before all artifacts are done (if tasks exist), after partial implementation, interleaved with other actions
• Allows artifact updates: If implementation reveals design issues, suggest updating artifacts - not phase-locked, work fluidly