Borrowing it
Nothing to install: this file belongs to charliehzm/medharness. 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/charliehzm/medharness/main/.claude/skills/openspec-apply-change/SKILL.mdgit clone --depth 1 https://github.com/charliehzm/medharnessWrote 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/charliehzm/medharness/openspec-apply-change)<a href="https://agentmods.dev/skills/charliehzm/medharness/openspec-apply-change"><img src="https://agentmods.dev/badge/skills/charliehzm/medharness/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/charliehzm/medharness/openspec-apply-change"><img src="https://agentmods.dev/badge/skills/charliehzm/medharness/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 | $0.00179 | $0.00619 |
| Opus 5 | $0.00089 | $0.00309 |
| Sonnet 5 | $0.00036 | $0.00124 |
| Haiku 4.5 | $0.00018 | $0.00062 |
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 11d 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.
What it actually says
OpenSpec Apply Change
The implementation step. One task per invocation. Stay in scope.
Discipline
- Read the task document; do exactly what it says.
- Do not bundle unrelated cleanup.
- Do not refactor adjacent code.
- Do not add comments unless WHY is non-obvious.
- If the task is wrong/incomplete, stop and route to
prd-implementation-precheckinstead.
Workflow
- Open the task document.
- Read the linked spec(s) for acceptance criteria.
- If any data-handling code involves L3/L4 → call
phi-desensitizefirst; never paste raw values. - Plan diff mentally; if > 2 files needed, re-decompose (call
task-decomposition). - Apply changes.
- Run quick local sanity (type-check, single test).
- Flip the task document checkbox to
[x]. - Do NOT mark the OpenSpec change as done — that's Step 7 Verify.
Common failure modes
- Scope creep — "while I'm here, let me also fix..." . Mitigation: discipline; flag adjacent issues to
spawn_task-style follow-up, not inline. - Bigger diff than spec — finish the task with 4 files. Mitigation: pause at file 2; re-decompose.
- PHI in prompt — pasted real schema row including patient_id. Mitigation: hook + skill enforcement.
- Comments that re-describe code — adds noise. Mitigation: comments only where WHY is non-obvious.
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.
- 11d ago First seen · 55 lines · 179 tokens per session scan A 0ade70ae3a4c
openspec-apply-change is a skill published in the GitHub repository charliehzm/medharness (86 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 179 tokens to every session and 619 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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