Borrowing it
Nothing to install: this file belongs to slettmayer/oebb-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.
curl -O https://raw.githubusercontent.com/slettmayer/oebb-mcp-server/main/CLAUDE.mdgit clone --depth 1 https://github.com/slettmayer/oebb-mcp-serverWrote 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/slettmayer/oebb-mcp-server/claude-md)<a href="https://agentmods.dev/instructions/slettmayer/oebb-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/slettmayer/oebb-mcp-server/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/slettmayer/oebb-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/slettmayer/oebb-mcp-server/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 | $0.00856 | $0.00856 |
| Opus 5 | $0.00428 | $0.00428 |
| Sonnet 5 | $0.00171 | $0.00171 |
| Haiku 4.5 | $0.00086 | $0.00086 |
Grade A, and why
oebb-mcp-server 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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OeBB MCP Server
MCP server for OeBB (Austrian Federal Railways) train data, usable by LLMs via the Model Context Protocol.
Quick Reference
- Lint:
ruff check . - Format:
ruff format . - Test (unit):
pytest tests/ -v -m "not integration" - Test (integration, real API):
pytest tests/ -v -m integration - Run server:
uvx --from . oebb-mcp-serverorpython -m oebb_mcp_server.server - Validate (CI): Ruff + pytest unit tests (all must pass via
gatejob) - Release: run the Auto Release workflow; the version comes from the git tag -- see Releasing
Architecture Overview
Thin adapter: MCP presentation layer wrapping a pure async OeBB API client. Purely functional, no classes. All code in src/oebb_mcp_server/.
server.py-- MCPServer tool registration, session lifecycle, stdio entry pointoebb_api.py-- pure async HTTP client for OeBB Scotty API (independently testable)const.py-- all constants (endpoint, auth, client config)
Data flow: MCP tool call -> server.py handler -> oebb_api.async_oebb_*() -> OeBB Scotty API -> JSON -> MCP tool result.
See Architecture for module boundaries and data flow detail.
Tech Stack
- Python 3.12+,
from __future__ import annotationsin every file mcp[cli](mcp.server.MCPServer) for MCP server framework -- v2 line, pinned>=2,<3aiohttpfor async HTTPrufffor linting/formatting,pytest+pytest-asynciofor testinguvfor environment management,hatchlingbuild backend- GitHub Actions CI (validate on push/PR)
See Tech Stack for full detail.
Core Conventions
- All async functions use
async_prefix; MCP tools use plainverb_noun - Constants in
const.pyonly -- no inline magic values - Logger:
_LOGGER = logging.getLogger(__name__)with%sformatting (not f-strings) - Import order:
__future__-> stdlib -> third-party -> local - Errors signaled via sentinel dict
{"message": "..."}, not exceptions - OeBB Scotty API is reverse-engineered -- response structure may change without notice
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.
- 9d ago First seen · 60 lines · 856 tokens per session scan A 524351e7ba3c
oebb-mcp-server CLAUDE.md is an instructions file published in the GitHub repository slettmayer/oebb-mcp-server (5 stars, last pushed 2d ago), licensed MIT. It adds 856 tokens to every session, about $0.0043 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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