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/mcp-server.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/mcp-server)<a href="https://agentmods.dev/instructions/valpere/chorus/mcp-server"><img src="https://agentmods.dev/badge/instructions/valpere/chorus/mcp-server/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/mcp-server"><img src="https://agentmods.dev/badge/instructions/valpere/chorus/mcp-server.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 | $0.00251 | $0.00251 |
| Opus 5.5 | $0.00100 | $0.00100 |
| Sonnet 5.5 | $0.00050 | $0.00050 |
| Haiku 4.5 | $0.00025 | $0.00025 |
Grade A, and why
chorus mcp-server.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.
- No unused imports. The file uses only `spawn`, `spawnSync` from `child_process` and `Server`/`StdioServerTransport` from the MCP SDK. What it actually says
OpenCode MCP server review guidelines
- Every new tool in
TOOLSmust have a matchingcasein thetools/callswitch. Missing cases cause silent failures. - Tools with no required args (e.g.
parallel_review) must not throw onargs = {}. The handler checksargs = {}as default. - Parallel orchestration helpers (
runCouncil,runParallelReview, etc.) must usePromise.all— never sequential awaits. - Individual agent failures inside
runParallelmust be caught and returned as[error: message]text, not thrown. One failing agent must not reject the wholePromise.all. delimit()output format must use═(U+2550) separator lines andAGENT: NAMEheaders to match the companion.mjs format.- Do not add OpenCode as a delegate in any parallel orchestration function — its stdout is not capturable (TUI limitation).
- No unused imports. The file uses only
spawn,spawnSyncfromchild_processandServer/StdioServerTransportfrom the MCP SDK.
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 · 251 tokens per session scan A 5c1ea6049fe2
chorus mcp-server.instructions.md is an instructions file published in the GitHub repository valpere/chorus (10 stars, last pushed 5mo ago), licensed MIT. It adds 251 tokens to every session, about $0.0010 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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