X: OpenSpec init

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---
name: openspec-apply-change
description: Implement tasks from an OpenSpec change. Use when the user wants to start implementing, continue implementation, or work through tasks.
allowed-tools: Bash(openspec:*)
license: MIT
compatibility: Requires openspec CLI.
metadata:
author: openspec
version: "1.0"
generatedBy: "1.7.0"
---
Implement tasks from an OpenSpec change.
**Store selection:** If the user names a store (a store is a standalone OpenSpec repo registered on this machine) or the work lives in one, run `openspec store list --json` to discover registered store ids, then pass `--store <id>` on the commands that read or write specs and changes (`new change`, `status`, `instructions`, `list`, `show`, `validate`, `archive`, `doctor`, `context`, `view`). Other commands do not take the flag. Hints printed by commands already carry the flag; keep it on follow-ups. Without a store, commands act on the nearest local `openspec/` root.
**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 active change exists
- If ambiguous, run `openspec list --json` to get available changes and ask the user to select one
Always announce: "Using change: <name>" and how to override (e.g., `$openspec-apply-change <other>`).
2. **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")
- `planningHome`, `changeRoot`, and `actionContext`: planning scope and edit constraints
- Which artifact contains the tasks (typically "tasks" for spec-driven, check status for others)
3. **Get apply instructions**
```bash
openspec instructions apply --change "<name>" --json
```
This returns:
- `contextFiles`: artifact ID -> array of concrete 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
- Optional `context`: current required project instruction input from the selected root
- Optional `operationGuidance`: current advisory guidance for apply
**Handle states:**
- If `state: "blocked"` (missing artifacts): show message, suggest using openspec-continue-change (if it is not installed, run `openspec status --change "<name>" --json` to see the next artifact and `openspec instructions <artifact-id> --change "<name>" --json` for how to create it)
- If `state: "all_done"`: congratulate, suggest archive
- Otherwise: proceed to implementation
Treat `context` as a required prompt-level input. Read and consider it, and
apply relevant project facts, conventions, and constraints while implementing.
Treat `operationGuidance` as optional additive advice. Read and consider every
entry, and follow entries that are applicable and compatible with the built-in
workflow.
Keep both fields separate from CLI-returned state, missing artifacts, tasks,
progress, `contextFiles`, and the built-in `instruction`. They are not
evidence of task completion, do not replace the built-in instruction, and do
not permit bypassing a blocked state. If context conflicts with the built-in
instruction, an explicit user choice, or a CLI-controlled value, report the
conflict and preserve the controlling value. If guidance is inapplicable or
conflicts with those controlling inputs, do not follow it and explain why.
These are prompt-level behavior contracts, not enforceable checks.
4. **Read context files**
Read every file path listed under `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
Do not copy `context` or `operationGuidance` verbatim into implementation
files or planning artifacts unless the user separately asks for that content.
5. **Show current progress**
Display:
- Schema being used
- Progress: "N/M tasks complete"
- Remaining tasks overview
- Dynamic instruction from CLI
6. **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
7. **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
- Do not use context or operation guidance as proof that a task is complete
- Apply relevant project context; report conflicts with controlling workflow inputs
- Consider every guidance entry; explain any inapplicable or conflicting advice
- Do not copy runtime context or operation guidance into implementation files or planning artifacts
- Preserve CLI-controlled blocked/ready/all-done behavior and completion criteria
**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