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Universal Tool Calling Protocol
Open protocol that lets AI agents call any native endpoint directly—HTTP, gRPC, WebSocket, CLI—without wrapper middleware
893 GitHub followersMPL-2.0 open sourceOfficial SDKs in TypeScript, Python, Go, RubyUTCP–MCP bridge to +230 toolsPublic RFC specification
Opportunity score
55/100
Strong technical narrative and emerging community, but weak monetization and distribution evidence make this a speculative open-source opportunity.
Founder verdict
MAYBE
A credible open-source protocol with real traction signals, but no visible revenue and a brutal standards war against MCP.
What is Universal Tool Calling Protocol?
Universal Tool Calling Protocol is an open-source standard and GitHub organization positioned as an alternative to MCP. Its core claim is that AI agents can discover and call existing native endpoints directly, avoiding a new wrapper server. Observed assets include a formal spec repo, official SDKs for Python, TypeScript, Go, and Ruby, a code-mode repo for multi-step workflows, an MCP bridge, and integrations with agent frameworks like LangChain, Pydantic AI, go-agent, and Strands. Revenue, pricing, team size, and growth are not publicly disclosed.
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