Borrowing it
Nothing to install: this file belongs to nick-railsback/skill-engine. 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/nick-railsback/skill-engine/main/CLAUDE.mdgit clone --depth 1 https://github.com/nick-railsback/skill-engineWrote 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/instructions/nick-railsback/skill-engine/claude-md)<a href="https://agentmods.dev/instructions/nick-railsback/skill-engine/claude-md"><img src="https://agentmods.dev/badge/instructions/nick-railsback/skill-engine/claude-md/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/instructions/nick-railsback/skill-engine/claude-md"><img src="https://agentmods.dev/badge/instructions/nick-railsback/skill-engine/claude-md.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 | $0.00518 | $0.00518 |
| Opus 5.5 | $0.00207 | $0.00207 |
| Sonnet 5.5 | $0.00104 | $0.00104 |
| Haiku 4.5 | $0.00052 | $0.00052 |
Grade A, and why
skill-engine CLAUDE.md 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 2mo 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.
How it starts
The opening of the file, as written. The whole thing — 43 lines — stays where its author put it; the contents beside it link to each section on GitHub.
skill-engine — standing rules
Domain knowledge is not here. It loads on demand from
.claude/skills/skill-engine-context/ — the artifact contract, the reference
invariants, verify.sh's checks, the workflows. Keep this file to rules that
apply on every turn; anything you'd have to look up belongs in that skill.
Before proposing a commit
Run make ci-local. It is the complete local check — the same five suites
.github/workflows/lint.yml runs (shellcheck, json, doctrine, tests,
examples), with no network and no model calls. make hooks-audit is one of
those suites, not a substitute for the target.
Green here is not green in CI. ci-local covers lint.yml and
hooks-audit.yml in full. security.yml is a third workflow, and three of its
gates run nowhere locally: bandit --severity-level high, semgrep --severity ERROR, and gitleaks. They stay out on purpose — semgrep resolves p/ci and
p/secrets from the registry, so folding them in would cost ci-local the
no-network property that makes it cheap enough to run on every change. That
residual is to be absorbed, not forgotten: when a change touches Python under
plugin/skill-engine/tests/, run the two gates by hand before proposing the
commit.
bandit -r plugin/skill-engine/tests --severity-level high -q
semgrep scan --config p/ci --config p/secrets \
--config .semgrep/skill-content.yml --severity ERROR --error
Versions
Six version surfaces across five files move together, and /release is what
moves them. Never bump one by hand: doctrine.sh's version-parity check fails
the build when they disagree, which is the point.
Git
Nothing is committed, pushed, tagged, or released on the maintainer's behalf —
prepare the change, then surface the commands for them to run. git commit,
git push, git tag and gh release create are all ask-gated in
.claude/settings.json, so the rule has mechanical backing; keep the two in
step if either changes. git add is not ask-gated — staging isn't
publishing, and re-confirming it on every save was pure friction.
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.
- 2mo ago First seen · 43 lines · 518 tokens per session scan A 082712aa277d
skill-engine CLAUDE.md is an instructions file published in the GitHub repository nick-railsback/skill-engine (2 stars, last pushed 18d ago), licensed MIT. It adds 518 tokens to every session, about $0.0021 per session on Opus 5.5. 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 2026-08-31.
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