What is u2-mcp CLAUDE.md?

Repository instructions for u2-mcp, a Python server that lets AI assistants work with Rocket Universe and UniData databases. It explains the project, commands, architecture, and ways the server communicates.

Running tests, checking code style and types, understanding the server structure, and working with its database and communication modes.

It gives an agent the project context and development commands needed to work in the repository without guessing.

How bpamiri/u2-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to bpamiri/u2-mcp. 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/bpamiri/u2-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/bpamiri/u2-mcp

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

[![agentmods](https://agentmods.dev/badge/instructions/bpamiri/u2-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/bpamiri/u2-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/bpamiri/u2-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/bpamiri/u2-mcp/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/bpamiri/u2-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/bpamiri/u2-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,084 This file is loaded in full into every session.

When invoked 2,084 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	$0.02084	$0.02084
Opus 5	$0.01042	$0.01042
Sonnet 5	$0.00417	$0.00417
Haiku 4.5	$0.00208	$0.00208

Measured 9d ago against content hash 2c6241227ebe, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

u2-mcp 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.

CLAUDE.md · 147 lines

How it starts

The opening of the file, as written. The whole thing — 147 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

u2-mcp is a Python MCP (Model Context Protocol) server that enables AI assistants to interact with Rocket Universe and UniData MultiValue databases. It uses Rocket's official uopy package and preserves native MultiValue semantics (multivalues, subvalues, dynamic arrays) rather than flattening to relational models.

Development Commands

pip install -e ".[dev]"                     # Install with dev dependencies

pytest                                      # All tests
pytest tests/test_config.py                 # Single file
pytest tests/test_utils/test_safety.py -k "test_name"  # Single test
pytest --cov=u2_mcp --cov-report=html       # With coverage
pytest tests/integration/ --run-integration # Integration tests (requires DB)

ruff check .                                # Lint
ruff format .                               # Format
mypy src/                                   # Type check

Architecture

Transport Modes

The server (server.py:main) supports three transport modes via CLI args:

stdio (default): u2-mcp — for Claude Desktop local connections
SSE (legacy): u2-mcp --http — HTTP/SSE for centralized deployment
Streamable HTTP: u2-mcp --streamable-http — for Claude.ai Integrations with OAuth

Tool Registration Pattern

Tools are registered via @mcp.tool() decorators on the module-level mcp FastMCP instance defined in server.py. Each tool module (tools/*.py) imports mcp from ..server and decorates its functions. The server.py bottom imports these modules to trigger registration:

# server.py registers tools by importing tool modules
from .tools import dictionary, files, query, subroutine, transaction

New tools: create a function in the appropriate tools/ module with @mcp.tool(). Resources use @mcp.resource("u2://name").

Global Singletons

Read the full file on GitHub · 147 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.

9d ago First seen · 147 lines · 2,084 tokens per session scan A 2c6241227ebe

Subscribe to this mod's changes

u2-mcp CLAUDE.md is an instructions file published in the GitHub repository bpamiri/u2-mcp (6 stars, last pushed 7mo ago), licensed Apache-2.0. It adds 2,084 tokens to every session, about $0.0104 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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u2-mcp: Instructions file for Claude Code