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/companion-scripts.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/companion-scripts)<a href="https://agentmods.dev/instructions/valpere/chorus/companion-scripts"><img src="https://agentmods.dev/badge/instructions/valpere/chorus/companion-scripts/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/companion-scripts"><img src="https://agentmods.dev/badge/instructions/valpere/chorus/companion-scripts.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 | $0.00366 | $0.00366 |
| Opus 5.5 | $0.00146 | $0.00146 |
| Sonnet 5.5 | $0.00073 | $0.00073 |
| Haiku 4.5 | $0.00037 | $0.00037 |
Grade A, and why
chorus companion-scripts.instructions.md scanned grade A with 1 finding 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.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
- `spawnSync` is allowed only for preflight version checks (`--version`). All actual agent invocations must use async `spawn`. What it actually says
Companion script review guidelines
spawnmust usestdio: 'pipe'when collecting output for delimited printing. Usingstdio: 'inherit'is correct only for pass-through single-agent delegation (existingrun/reviewcommands).spawnSyncis allowed only for preflight version checks (--version). All actual agent invocations must use asyncspawn.- Each
runAgent/ parallel orchestration call must handle theerrorevent on the child process to resolve gracefully — never let an unhandled error abort sibling agent calls. - Role prompts prepended to tasks must be clearly labelled (e.g.
You are the CORRECTNESS reviewer) so the agent understands its council role without ambiguity. stripFlagsmust remove--background,--wait,--json, and--agent/--agent=*before passing the task string to CLIs.check-allsubcommand must check all five target CLIs (claude,gemini,codex,cursor,kilo) and print which ones are missing with a reference to the appropriate/setupcommand. OpenCode is excluded — its TUI stdout is not capturable.companion.mjsis a dual-purpose module: it exports helpers (stripFlags,checkCli,filterAvailable,runAgent,printDelimited,printJSON,requireAvailable,REGISTRY) for tests, and runs the CLI dispatcher whenimport.meta.url === \file://${process.argv[1]}`. Tests live inplugins/chorus/scripts/tests/and run withnpm test`.
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 · 14 lines · 366 tokens per session scan A 0c34c60caf0d
chorus companion-scripts.instructions.md is an instructions file published in the GitHub repository valpere/chorus (10 stars, last pushed 5mo ago), licensed MIT. It adds 366 tokens to every session, about $0.0015 per session on Opus 5.5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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