fastmcp-sentry

A sample FastMCP server with Sentry MCP tracing.

Setup

Requires Python 3.13+, uv, and Node.js (for the MCP Inspector).

git clone https://github.com/obostjancic/fastmcp-sentry-demo.git
cd fastmcp-sentry-demo
uv sync

Create a .env file with your Sentry DSN:

SENTRY_DSN=https://your-key@your-org.ingest.sentry.io/your-project

Run

source .env && uv run python server.py

Starts the MCP server on http://localhost:8000 (streamable-http transport).

To also launch the MCP Inspector:

./dev.sh

What's inside

Type	Name	Description
Tool	search_books	Search books by title/author, optional min_rating filter
Tool	add_book	Add a new book (ISBN, title, author, year, optional rating)
Prompt	recommend_books	Ask an LLM to recommend books in a genre
Prompt	summarize_book	Ask for a concise summary of a book
Resource	bookshelf://catalog	Full JSON catalog
Resource	bookshelf://stats	Aggregate stats (count, avg rating, year range)

Sentry integration

The Sentry SDK is initialized with MCPIntegration() — every tool call, prompt render, and resource read is traced automatically. The DSN comes from the SENTRY_DSN env var.