Borrowing it
Nothing to install: this file belongs to crimSun-dev/crimSun-chrome-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/crimSun-dev/crimSun-chrome-mcp/main/.claude/skills/openspec-apply-change/SKILL.mdgit clone --depth 1 https://github.com/crimSun-dev/crimSun-chrome-mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/crimsun-dev/crimsun-chrome-mcp/openspec-apply-change)<a href="https://agentmods.dev/skills/crimsun-dev/crimsun-chrome-mcp/openspec-apply-change"><img src="https://agentmods.dev/badge/skills/crimsun-dev/crimsun-chrome-mcp/openspec-apply-change/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/crimsun-dev/crimsun-chrome-mcp/openspec-apply-change"><img src="https://agentmods.dev/badge/skills/crimsun-dev/crimsun-chrome-mcp/openspec-apply-change.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00031 | $0.01268 |
| Opus 5 | $0.00015 | $0.00634 |
| Sonnet 5 | $0.00006 | $0.00254 |
| Haiku 4.5 | $0.00003 | $0.00127 |
Grade A, and why
openspec-apply-change scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
80% identical to openspec-apply-change — 11 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 160 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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). 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
-
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 --jsonto get available changes and use the AskUserQuestion tool to let the user select
Always announce: "Using change: " and how to override (e.g.,
/opsx:apply <other>). -
Check status to understand the schema
openspec status --change "<name>" --jsonParse the JSON to understand:
schemaName: The workflow being used (e.g., "spec-driven")planningHome,changeRoot, andactionContext: planning scope and edit constraints- Which artifact contains the tasks (typically "tasks" for spec-driven, check status for others)
-
Get apply instructions
openspec instructions apply --change "<name>" --jsonThis 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
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 every file path listed under
contextFilesfrom 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?
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 10d ago First seen · 160 lines · 31 tokens per session scan A 244c1997aa8d
openspec-apply-change is a skill published in the GitHub repository crimSun-dev/crimSun-chrome-mcp (0 stars, last pushed 9d ago), licensed MIT. It adds 31 tokens to every session and 1,268 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 80% identical to openspec-apply-change, differing in 11 lines, and is treated as a copy.
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