Borrowing it
Nothing to install: this file belongs to railyard-sh/railyard-mcp. 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/railyard-sh/railyard-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/railyard-sh/railyard-mcpWrote 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/railyard-sh/railyard-mcp/claude-md)<a href="https://agentmods.dev/instructions/railyard-sh/railyard-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/railyard-sh/railyard-mcp/claude-md/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/railyard-sh/railyard-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/railyard-sh/railyard-mcp/claude-md.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 | $0.00505 | $0.00505 |
| Opus 5 | $0.00253 | $0.00253 |
| Sonnet 5 | $0.00101 | $0.00101 |
| Haiku 4.5 | $0.00051 | $0.00051 |
Grade A, and why
railyard-mcp CLAUDE.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 10d 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
mcp/ — the Railyard MCP server
railyard-mcp: a Model Context Protocol server (stdio) that gives an MCP client (Claude Desktop/Code,
Cursor, …) read + write access to Railyard over the REST API, authenticated with a personal access
token. TypeScript on @modelcontextprotocol/sdk.
- Source:
src/index.ts(the server + all ~29 tools) andsrc/client.ts(a typed REST client — it's an accurate, compact description of the backend API; handy when documenting endpoints). Build:npm run build(tsc→dist/); entrydist/index.js(has a shebang;bin=railyard-mcp). - Config (env vars, read in
src/index.ts):RAILYARD_TOKEN(required — ary_…PAT minted in the app under User settings → Personal access tokens),RAILYARD_BASE_URL(optional; code defaulthttp://localhost:8080, docs usehttps://railyard.sh),RAILYARD_ORG(optional default org). - Install collateral:
README.md(full tool table + copy-paste client configs),INSTALL.md(get-token → add-server → verify),manifest.json(a.mcpb/DXT desktop-extension manifest for one-click Claude Desktop install),LICENSE(MIT).
Not yet published
The npx -y railyard-mcp snippets only work once the package is published to npm — that's an operator
action (choose/confirm the public name, npm publish, and npx @anthropic-ai/mcpb pack to build the
.mcpb). Until then, use the from-source path (node /abs/path/mcp/dist/index.js).
Notes
- The tool set covers projects, validation/export, orgs, members/invites and billing. It does not yet
expose the newer org device-roles endpoints (
get/set_org_roles) — add tools mirroring the catalogue ones if needed. - Validate:
npm run build+npm run typecheck. Don'tnpm publishwithout the operator's go-ahead.
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.
- 10d ago First seen · 29 lines · 505 tokens per session scan A b0bba231c1d0
railyard-mcp CLAUDE.md is an instructions file published in the GitHub repository railyard-sh/railyard-mcp (0 stars, last pushed 22d ago), licensed MIT. It adds 505 tokens to every session, about $0.0025 per session on Opus 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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