What is idfm-mcp-server CLAUDE.md?

A set of coding instructions for an MCP server that connects Claude Desktop to Paris public transport data. It describes the APIs, authentication, available tools, and data formats.

Use it when implementing or maintaining tools that search Île-de-France stops, show upcoming departures, plan journeys, or report service disruptions.

It gives the coding agent project-specific details needed to work with the transport service correctly, including real-time data and secure API access.

How HeshamWM/idfm-mcp-server configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to HeshamWM/idfm-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/HeshamWM/idfm-mcp-server/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/HeshamWM/idfm-mcp-server

Made for: Claude Code.

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README.md

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Per session 1,348 This file is loaded in full into every session.

When invoked 1,348 The same file — it is already loaded in full.

Security scan A 1 finding. 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.

Model	Per session	Once invoked
Fable 5.1	$0.01348	$0.01348
Opus 5	$0.00674	$0.00674
Sonnet 5	$0.00270	$0.00270
Haiku 4.5	$0.00135	$0.00135

Measured 8d ago against content hash c9348578fd2d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

idfm-mcp-server CLAUDE.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 8d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -H "apiKey: YOUR_KEY" \

CLAUDE.md · 183 lines

How it starts

The opening of the file, as written. The whole thing — 183 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md - Île-de-France Mobilités MCP Server Implementation Guide

Overview

This MCP server provides Claude Desktop with access to the Paris public transport network (Île-de-France Mobilités) through the PRIM API.

Implementation Details

API Integration

The server integrates with the PRIM (Platform for Regional Information on Mobility) API which provides:

SIRI Lite API - Real-time departures (/stop-monitoring)
Navitia API - Journey planning and search (/v2/navitia/)
General Messages API - Traffic disruptions (/general-message)

Authentication

Uses API key authentication via HTTP header apiKey
API key stored securely in Docker Desktop secrets as IDFM_API_KEY
Key obtained from: https://prim.iledefrance-mobilites.fr/

Tools Implemented

1. get_next_departures

Purpose: Get real-time departure times for a specific stop
Input: Stop ID (from search_stops), optional max results
Output: List of next departures with line, destination, and time
API: SIRI Lite Stop Monitoring endpoint

2. search_stops

Purpose: Find stop IDs by searching for station names
Input: Search query (station name or location)
Output: List of matching stops with IDs and coordinates
API: Navitia Places endpoint
Note: Essential for finding stop IDs needed by get_next_departures

3. search_routes

Purpose: Calculate journey itineraries between two locations
Input: From location, to location, optional datetime
Output: Multiple journey options with transfers and timings
API: Navitia Journeys endpoint
Formats: Can use coordinates (lat;lon) or place IDs

4. get_traffic_info

Purpose: Get real-time service disruptions and messages
Input: Optional line ID to filter
Output: List of current disruptions and service messages
API: SIRI Lite General Message endpoint

5. get_line_info

Purpose: Get detailed information about a transport line
Input: Line ID
Output: Line details, routes, and directions
API: Navitia Lines endpoint

Read the full file on GitHub · 183 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.

8d ago First seen · 183 lines · 1,348 tokens per session scan A c9348578fd2d

Subscribe to this mod's changes

idfm-mcp-server CLAUDE.md is an instructions file published in the GitHub repository HeshamWM/idfm-mcp-server (2 stars, last pushed 9mo ago), licensed MIT. It adds 1,348 tokens to every session, about $0.0067 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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idfm-mcp-server: Instructions file for Claude Code