openspec-apply-change

Implement tasks from an OpenSpec 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

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 active change exists
- If ambiguous, run
```
openspec list --json
```
  to get available changes and use the AskUserQuestion tool to let the user select
Always announce: "Using change: <name>" and how to override (e.g.,
```
/opsx:apply <other>
```
).
Check status to understand the schema
bash
```
openspec status --change "<name>" --json
```
Parse the JSON to understand:
- ```
schemaName
```
  : The workflow being used (e.g., "spec-driven")
- Which artifact contains the tasks (typically "tasks" for spec-driven, check status for others)
Get apply instructions
bash
```
openspec instructions apply --change "<name>" --json
```
This returns:
- Context file paths (varies by schema - could be proposal/specs/design/tasks or spec/tests/implementation/docs)
- Progress (total, complete, remaining)
- Task list with status
- Dynamic instruction based on current state
Handle states:
- If
```
state: "blocked"
```
  (missing artifacts): show message, suggest using openspec-continue-change
- If
```
state: "all_done"
```
  : congratulate, suggest archive
- Otherwise: proceed to implementation
Read context files
Read the files listed in
```
contextFiles
```
from the apply instructions output. The files depend on the schema being used:
- spec-driven: proposal, specs, design, tasks
- Other schemas: follow the contextFiles from CLI output
Show current progress

Display:
- Schema being used
- Progress: "N/M tasks complete"
- Remaining tasks overview
- Dynamic instruction from CLI
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
On completion or pause, show status

Display:
- Tasks completed this session
- Overall progress: "N/M tasks complete"
- If all done: suggest archive
- If paused: explain why and wait for guidance

Output During Implementation

## Implementing: <change-name> (schema: <schema-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>
**Schema:** <schema-name>
**Progress:** 7/7 tasks complete ✓

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

All tasks complete! Ready to archive this change.

Output On Pause (Issue Encountered)

## Implementation Paused

**Change:** <change-name>
**Schema:** <schema-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 context files before starting (from the apply instructions output)
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
Use contextFiles from CLI output, don't assume specific file names

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

openspec-apply-change

NPX Install

SKILL.md Content