Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/valpere/chorus/mcp-servergit 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.svg" alt="Measured on agentmods" 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 | $0.00251 | $0.00251 |
| Opus 5 | $0.00125 | $0.00125 |
| Sonnet 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 3d 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.
- 3d 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 3mo ago), licensed MIT. It adds 251 tokens to every session, about $0.0013 per session on Opus 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.
Other instructions, from other repositories
TokenPilot AGENTS.md
AGENTS.md instructions for eowlsdh/TokenPilot, covering project knowledge base, structure, where to look, code map and conventions.
Project-AMBER AGENTS.md
Instructions for JJHbrams/Project-AMBER, covering agent orchestration, roles and non-negotiable rules.
TokenPilot CLAUDE.md
Claude Code instructions for eowlsdh/TokenPilot, a project described as: Local-first macOS menu bar utility for AI coding-tool usage metadata.
semble-hooks CLAUDE.md
Instructions for benediktkraus/semble-hooks, covering semble hooks — claude.md, was ist das, projekt-typ, tech-stack and architektur-referenz.
ystack GEMINI.md
Gemini CLI instructions for Yasuui/ystack, covering gemini.md — ystack ⚡, this is the primary config file for antigravity ide, agents.md remains for compatibility with other tools, identity and subagent dispatch.
Project-AMBER project-guides.instructions.md
Project coding guidelines, todo monitoring rules, and context for AI agents working on Project Engram.