python-utcp CLAUDE.md

Project instructions for developing and installing the Python implementation of the Universal Tool Calling Protocol, a standard for defining and using tools across different communication methods. They describe the project structure, setup, build, installation, and tests.

In plain words
What is it for?
Use them when installing dependencies, creating a development environment, building the package, installing it locally, or running the test suite.
Why use it?
They give contributors one place to find the commands and development conventions needed to work on the repository. This reduces uncertainty when setting up the environment or checking changes.

Instructions file

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/universal-tool-calling-protocol/python-utcp/claude-md
Clone the repo
git clone --depth 1 https://github.com/universal-tool-calling-protocol/python-utcp
Per session 871 This file is loaded in full into every session.
When invoked 871 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00871 $0.00871
Opus 5 $0.00436 $0.00436
Sonnet 5 $0.00174 $0.00174
Haiku 4.5 $0.00087 $0.00087

Measured yesterday against content hash a52f328d559d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

python-utcp 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 yesterday.

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 · 113 lines

How it starts

The opening of the file, as written. The whole thing — 113 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 the Python implementation of the Universal Tool Calling Protocol (UTCP), a flexible and scalable standard for defining and interacting with tools across various communication protocols. UTCP emphasizes scalability, interoperability, and ease of use compared to other protocols like MCP.

Development Commands

Building and Installation

# Create virtual environment and install dependencies
conda create --name utcp python=3.10
conda activate utcp
pip install -r requirements.txt
python -m pip install --upgrade pip

# Build the package
python -m build

# Install locally
pip install dist/utcp-<version>.tar.gz

Testing

# Run all tests
pytest

# Run tests with coverage
pytest --cov=src/utcp

# Run specific plugin tests
pytest plugins/communication_protocols/http/tests/
pytest plugins/communication_protocols/websocket/tests/

Development Dependencies

  • Install dev dependencies: pip install -e .[dev]
  • Key dev tools: pytest, pytest-asyncio, pytest-aiohttp, pytest-cov, coverage, fastapi, uvicorn

Architecture Overview

Core Components

Client Architecture (src/utcp/client/):

  • UtcpClient: Main entry point for UTCP ecosystem interaction
  • UtcpClientConfig: Pydantic model for client configuration
  • ClientTransportInterface: Abstract base for transport implementations
  • ToolRepository: Interface for storing/retrieving tools (default: InMemToolRepository)
  • ToolSearchStrategy: Interface for tool search algorithms (default: TagSearchStrategy)

Shared Models (src/utcp/shared/):

  • Tool: Core tool definition with inputs/outputs schemas
  • Provider: Defines communication protocols for tools
  • UtcpManual: Contains discovery information for tool collections
  • Auth: Authentication models (API key, Basic, OAuth2)

Transport Layer (src/utcp/client/transport_interfaces/): Each transport handles protocol-specific communication:

  • HttpClientTransport: RESTful HTTP/HTTPS APIs
  • CliTransport: Command Line Interface tools
  • SSEClientTransport: Server-Sent Events
  • StreamableHttpClientTransport: HTTP chunked transfer
  • MCPTransport: Model Context Protocol interoperability
  • TextTransport: Local file-based tool definitions
  • GraphQLClientTransport: GraphQL APIs

Read the full file on GitHub · 113 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.

  1. yesterday First seen · 113 lines · 871 tokens per session scan A a52f328d559d

Subscribe to this mod's changes

python-utcp CLAUDE.md is an instructions file published in the GitHub repository universal-tool-calling-protocol/python-utcp (646 stars, last pushed 2mo ago), licensed MPL-2.0. It adds 871 tokens to every session, about $0.0044 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 2026-08-30.