universal-tool-calling-protocol/python-utcp

pip install utcp utcp-http  # core + HTTP plugin (most common)
pip install utcp-cli utcp-mcp utcp-text  # additional protocol plugins
Editable dev install: git clone ... && pip install -e "core[dev]" && pip install -e plugins/communication_protocols/http

Usage

• •client = await UtcpClient.create(config={...manual_call_templates...}); result = await client.call_tool("my_api.get_data", {"id":"123"})
• •Expose your own tools: FastAPI app with a /utcp discovery endpoint returning a UtcpManual (via @utcp_tool decorator or hand-written JSON)
• •Ingest any OpenAPI spec as tools with zero infrastructure: OpenApiConverter(openapi_spec).convert() or point a call_template URL at an openapi.json
• •Enforce security: set allowed_communication_protocols so a manual can only call tools of permitted protocols

Key features

• ✓Plugin-based communication protocols: utcp-http (HTTP/REST/SSE/streaming), utcp-cli, utcp-mcp, utcp-text, utcp-websocket (stable); utcp-socket (TCP/UDP) and utcp-gql (GraphQL) in progress
• ✓OpenAPI ingestion converts OpenAPI 2.0/3.0 specs into UTCP tools automatically — no wrapper servers, selective auth for protected endpoints
• ✓Protocol restrictions (allowed_communication_protocols) prevent dangerous protocol escalation (secure by default)
• ✓Pydantic data models (Tool, CallTemplate, UtcpManual, Auth), pluggable tool repositories and search strategies, variable substitution namespacing
• ✓Docs/examples show both UTCP-decorated and dependency-free server implementations

Best for

Python developers building multi-protocol tool registration and calling infrastructure for AI agents, including automatic OpenAPI-to-tool conversion.

Caveats

• ⚠1.0.0 introduces breaking changes from 0.x — migration guide included (call_template_type replaces provider_type, http_stream renamed to streamable_http, tool names namespaced as manual.tool)
• ⚠socket and gql plugins are marked in progress
• ⚠mcp plugin config requires transport (e.g., stdio) and command in the config block