Borrowing it
Nothing to install: this file belongs to valpere/chorus. 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/valpere/chorus/main/.github/instructions/skill-files.instructions.mdgit clone --depth 1 https://github.com/valpere/chorusWrote 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/valpere/chorus/skill-files)<a href="https://agentmods.dev/instructions/valpere/chorus/skill-files"><img src="https://agentmods.dev/badge/instructions/valpere/chorus/skill-files/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/valpere/chorus/skill-files"><img src="https://agentmods.dev/badge/instructions/valpere/chorus/skill-files.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 | $0.00395 | $0.00395 |
| Opus 5.5 | $0.00158 | $0.00158 |
| Sonnet 5.5 | $0.00079 | $0.00079 |
| Haiku 4.5 | $0.00040 | $0.00040 |
Grade A, and why
chorus skill-files.instructions.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 1mo 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
SKILL.md review guidelines
Gemini skills (for-gemini/) must have frontmatter with:
name— kebab-case, prefixed withchorus-description— multi-line prose with trigger phrases the model will match onlicense: MITmetadata.authorandmetadata.version
Codex skills (for-codex/) must have frontmatter with only:
name— kebab-case, prefixed withchorus-description— single concise line
All skills must include:
## When to use— bullet list of trigger phrases and scenarios## Invocation— bash code block with the exact CLI command(s) to run## Output handling— what to do with the result (verbatim / synthesize / etc.)
Codex skills that involve file reading (parallel-review, parallel-debug) must include a ## Known limitation section noting the sandbox restriction.
Second-opinion defaults are host-specific: a host's own skill should not default to itself. Example: the chorus command defaults to Gemini; for-gemini/second-opinion defaults to Claude (Gemini is the caller, so it asks someone else).
Invocation bash blocks must use the correct non-interactive flags:
- Claude:
claude --print "..." --dangerously-skip-permissions - Gemini:
gemini --prompt "..." --yolo --output-format text - Codex:
codex exec "..." - Cursor:
agent -p --force "..."(binary isagent, notcursor) - Kilo:
kilo run --auto "..."
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.
- 1mo ago First seen · 32 lines · 395 tokens per session scan A 7c1c2db3b80c
chorus skill-files.instructions.md is an instructions file published in the GitHub repository valpere/chorus (10 stars, last pushed 5mo ago), licensed MIT. It adds 395 tokens to every session, about $0.0016 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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