What is mcp-server-datahub CLAUDE.md?

Repository instructions for an MCP server that connects an AI coding agent to DataHub, a platform for cataloguing and tracing data. The server can search entities, fetch metadata, follow lineage graphs and list SQL queries.

Setting up development, formatting and checking code, running tests, cleaning build files and launching the server with MCP Inspector.

They explain how to set up, check and test the project, including that tests need an authenticated, running DataHub instance.

mcp-server-datahub CLAUDE.md — Instructions file for coding agents by shemreader: Repository instructions for an MCP server that connects an

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add instructions/shemreader/mcp-server-datahub/claude-md

Clone the repo

git clone --depth 1 https://github.com/shemreader/mcp-server-datahub

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

[![agentmods](https://agentmods.dev/badge/instructions/shemreader/mcp-server-datahub/claude-md.svg)](https://agentmods.dev/instructions/shemreader/mcp-server-datahub/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/shemreader/mcp-server-datahub/claude-md"><img src="https://agentmods.dev/badge/instructions/shemreader/mcp-server-datahub/claude-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 563 This file is loaded in full into every session.

When invoked 563 The same file — it is already loaded in full.

Security scan A 0 findings. Scan, not verified.

Origin 92% copy Near-identical to another mod 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	$0.00563	$0.00563
Opus 5	$0.00282	$0.00282
Sonnet 5	$0.00113	$0.00113
Haiku 4.5	$0.00056	$0.00056

Measured 3d ago against content hash fe11b3f0ad5d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

mcp-server-datahub 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 3d 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.

Origin

This is a copy

92% identical to mcp-server-datahub CLAUDE.md — 5 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CLAUDE.md · 73 lines

How it starts

The opening of the file, as written. The whole thing — 73 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 implementation for DataHub. The server provides tools for searching entities, fetching metadata, traversing lineage graphs, and listing SQL queries. It's built using the FastMCP framework and integrates with DataHub's GraphQL API.

Development Commands

See DEVELOPING.md and Makefile for more details.

A quick summary is below:

make setup - Set up development environment (requires uv)
make lint - Run ruff formatting, linting and type checking
make test - Run pytest tests (requires live DataHub instance)
make clean - Clean up build artifacts

Testing

Run all tests: make test
Single test file: uv run pytest tests/test_mcp_server.py
Tests require a live DataHub instance with proper authentication

Development Setup

Run the server using MCP inspector for development:

source .venv/bin/activate
mcp dev src/mcp_server_datahub/__main__.py

Architecture

Core Components

mcp_server.py: Main server implementation with MCP tools
- get_entity(): Fetch entity metadata by URN
- search(): Search across DataHub entities with filters
- get_dataset_queries(): Get SQL queries for datasets
- get_lineage(): Traverse upstream/downstream lineage
GraphQL Integration: Uses GraphQL fragments for efficient queries
- gql/search.gql: Search queries
- gql/entity_details.gql: Entity metadata queries
- gql/queries.gql: SQL query retrieval
Client Management: Context-aware DataHub client handling
- Uses contextvars for thread-safe client management
- Supports both DataHub Cloud and on-premise instances

Key Patterns

All tools return cleaned GraphQL responses (removes __typename fields)
DataHub Cloud instances get URL injection for entities
Filter compilation uses DataHub SDK's compile_filters()
Lineage traversal supports configurable hop limits (1-3+ degrees)

Read the full file on GitHub · 73 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.

3d ago First seen · 73 lines · 563 tokens per session scan A fe11b3f0ad5d

Subscribe to this mod's changes

mcp-server-datahub CLAUDE.md is an instructions file published in the GitHub repository shemreader/mcp-server-datahub (0 stars, last pushed 8mo ago), licensed Apache-2.0. It adds 563 tokens to every session, about $0.0028 per session on Opus 5. A static security scan graded it A with 0 findings. It is 92% identical to mcp-server-datahub CLAUDE.md, differing in 5 lines, and is treated as a copy.

Data and AI

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 6,785 tokens

mcp-server-datahub CLAUDE.md