What is yamcs-mcp-server CLAUDE.md?

Repository instructions for working on an MCP server that connects AI assistants to Yamcs, an open-source mission-control system.

Setting up dependencies, starting the server, running tests, checking coverage, and linting the Yamcs integration.

They give the project setup, run, test, and code-quality commands in one place, reducing guesswork when changing the repository.

How PaulMRamirez/yamcs-mcp-server configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to PaulMRamirez/yamcs-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/PaulMRamirez/yamcs-mcp-server/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/PaulMRamirez/yamcs-mcp-server

Made for: Claude Code.

Wrote 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.

README.md

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Your own site

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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.

Your own site · 80×15

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Per session 2,054 This file is loaded in full into every session.

When invoked 2,054 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.

Model	Per session	Once invoked
Fable 5.1	$0.02054	$0.02054
Opus 5.5	$0.00822	$0.00822
Sonnet 5.5	$0.00411	$0.00411
Haiku 4.5	$0.00205	$0.00205

Measured 2mo ago against content hash 5ea2f41e41e0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

yamcs-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 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.

CLAUDE.md · 243 lines

How it starts

The opening of the file, as written. The whole thing — 243 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

This is a Model Context Protocol (MCP) server for Yamcs (Yet Another Mission Control System). It provides a bridge between AI assistants and mission control systems using FastMCP 2.x with a modular component architecture.

Key Commands

Development Setup

# Install all dependencies including dev tools
uv sync --all-extras

# Install pre-commit hooks
pre-commit install

Running the Server

# Run the server (will connect to Yamcs at http://localhost:8090)
uv run yamcs-mcp

# Run directly as Python module
uv run python -m yamcs_mcp.server

# Run in demo mode without Yamcs (shows warning but continues)
uv run python -m yamcs_mcp.server  # Yamcs connection failure is non-fatal

Testing

# Run all tests with coverage
uv run pytest

# Run specific test file
uv run pytest tests/test_server.py -v

# Run specific test
uv run pytest tests/test_server.py::test_server_initialization -v

# Run tests with coverage report
uv run pytest --cov=yamcs_mcp --cov-report=html

Code Quality

# Run linting
uv run ruff check .

# Run linting with auto-fix
uv run ruff check . --fix

# Run type checking
uv run mypy src/

# Format code
uv run ruff format .

Architecture Overview

Server Composition Pattern

The server uses FastMCP's server composition pattern where each Yamcs subsystem is implemented as an independent FastMCP server that gets mounted to the main server:

BaseYamcsServer (src/yamcs_mcp/servers/base_server.py)
- Base class extending FastMCP for all servers
- Provides common functionality like error handling
- Each server is a full FastMCP instance
Servers (in src/yamcs_mcp/servers/)
- MDBServer - Mission Database operations
- LinksServer - Data link management
- ProcessorsServer - Processor control
- InstancesServer - Instance management
- StorageServer - Object storage operations
- AlarmsServer - Alarm management and monitoring

Read the full file on GitHub · 243 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.

2mo ago First seen · 243 lines · 2,054 tokens per session scan A 5ea2f41e41e0

Subscribe to this mod's changes

yamcs-mcp-server CLAUDE.md is an instructions file published in the GitHub repository PaulMRamirez/yamcs-mcp-server (4 stars, last pushed 1y ago), licensed MIT. It adds 2,054 tokens to every session, about $0.0082 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.

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yamcs-mcp-server: Instructions file for Claude Code