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node-mcp-server: Instructions file for Codex

AGENTS.md

node-mcp-server AGENTS.md is an instructions file for Codex, OpenCode from my-mcp-hub/node-mcp-server. It costs 649 tokens per session, scanned A, original, MIT.

A project guide for contributing to the node-mcp-server codebase, covering its tools, structure, rules, and checks. MCP is a standard way for programs to provide tools and data to AI assistants.

In plain words
What is it for?
Use it when installing dependencies, building, testing, running the server, checking its command-line modes, or validating package contents.
Why use it?
It records the repository's expected Node.js version, commands, architecture rules, and testing process so changes can be made consistently.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md.

This is my-mcp-hub/node-mcp-server's own configuration. It tells Codex and OpenCode how to work on node-mcp-server itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything node-mcp-server configures →

not rated 2repo 2d ago A scan 649 tokens original MIT
View source ↗ my-mcp-hub/node-mcp-server
Reuse

Borrowing it

Nothing to install: this file belongs to my-mcp-hub/node-mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/my-mcp-hub/node-mcp-server/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/my-mcp-hub/node-mcp-server

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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README.md
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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.

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Your own site · 80×15
<a href="https://agentmods.dev/instructions/my-mcp-hub/node-mcp-server/agents-md"><img src="https://agentmods.dev/badge/instructions/my-mcp-hub/node-mcp-server/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 649 This file is loaded in full into every session.
When invoked 649 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00649 $0.00649
Opus 5.5 $0.00260 $0.00260
Sonnet 5.5 $0.00130 $0.00130
Haiku 4.5 $0.00065 $0.00065

Measured 2mo ago against content hash e158159ee298, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

node-mcp-server AGENTS.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.

AGENTS.md · 32 lines

How it starts

The opening of the file, as written. The whole thing — 32 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Repository guide

Toolchain and verification

  • Use Node 22 (.nvmrc) and npm 10; package-lock.json is the dependency source of truth. Use npm ci for a clean install.
  • npm run check matches CI's lint, build, coverage sequence; build itself runs type-check, esbuild, then tsc-alias.
  • Run one test file with npx vitest run tests/tools/index.test.ts; add -t 'test name' for one case.
  • npm run dev:stdio and npm run dev:web watch the source and start MCP Inspector. The web endpoint is http://localhost:8401/mcp.
  • npm pack --dry-run validates the publish allowlist and triggers a fresh production build; CI uses --ignore-scripts only because it builds first.

Architecture and invariants

  • src/index.ts is the CLI entrypoint. Omitting the command starts stdio; stdio is also accepted explicitly, while web selects Streamable HTTP. Only web accepts --port; it and PORT must resolve to an integer from 1 to 65535.
  • Production builds preserve every src/**/*.ts module under build with bundle: false; tsc-alias rewrites @/ imports and adds Node ESM .js suffixes. Keep scripts/aliasReplacer.cjs, tsconfig.json, and the esbuild output layout synchronized.
  • src/services/index.ts#createServer is the shared server factory. Register tools, resources, and prompts through their src registrars so both transports expose the same behavior.
  • The HTTP transport uses Fastify; Express middleware and lifecycle patterns do not apply.
  • src/data/documents.ts is the single built-in knowledge-base source; record changes affect tool ranking, resource URIs/listing, prompt completion, and their tests.
  • The server and tests pin MCP protocol 2026-07-28. Avoid session-ID-dependent behavior because the HTTP handler creates independent server instances.
  • Tools with an outputSchema must return matching structuredContent and a text fallback.

Test and runtime gotchas

  • Vitest global setup launches a real web server and setup launches a real stdio child; transport tests iterate over both clients.
  • Even a focused test starts HTTP on port 8401. Stop dev:web or any other listener first, and keep Vitest at one worker because the shared port and global clients are not parallel-safe.
  • Never write ordinary logs to stdout on the stdio path; stdout carries MCP protocol messages.
  • src/assets/mcp.stdio.json and src/assets/mcp.http.json configure Inspector launch targets.

Read the full file on GitHub · 32 lines

Changes

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.

  1. 2mo ago First seen · 32 lines · 649 tokens per session scan A e158159ee298

Subscribe to this mod's changes

node-mcp-server AGENTS.md is an instructions file published in the GitHub repository my-mcp-hub/node-mcp-server (2 stars, last pushed 2d ago), licensed MIT. It adds 649 tokens to every session, about $0.0026 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.

mcpmcp-server
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