go-utcp
go-utcp is a Go implementation of the Universal Tool Calling Protocol (UTCP) that lets clients discover and call tools through multiple transport types (e.g., HTTP, WebSocket, gRPC, GraphQL, TCP/UDP, CLI, SSE/streaming HTTP) and provides utilities like environment-variable substitution (.env) and an OpenAPI-to-manual converter.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
README mentions env-var substitution via UtcpDotEnv but does not describe how secrets are stored, masked, or logged. Auth, TLS enforcement behavior, and scope/granularity for the various transports/providers are not documented in the provided content. If CodeMode is used, LLM-driven code execution (even via Yaegi sandbox) should be treated as a high-risk capability requiring careful review.
⚡ Reliability
Best When
You want a self-hosted Go library to standardize tool calling across multiple protocols/providers and you can review/secure the underlying transports and any plugin execution paths.
Avoid When
You cannot audit transport security/auth behavior or you are not prepared to mitigate risks around executing LLM-supplied code (if using CodeMode).
Use Cases
- • Tool discovery and tool invocation across heterogeneous backends using a unified interface
- • Building agent toolchains in Go with multiple provider/transport options
- • Converting OpenAPI definitions into UTCP manuals for tool publishing
- • Running LLM-assisted workflows via UTCP, including a Yaegi-based code execution plugin (CodeMode)
Not For
- • Hosting sensitive systems where arbitrary code execution by an LLM is unacceptable (CodeMode)
- • Services that require strict, documented transport security guarantees without reviewing the implementations
- • Teams needing a managed SaaS with SLAs, pricing tiers, and hosted reliability guarantees
Interface
Authentication
The README does not specify a built-in authentication scheme. It describes transports/providers, but auth method details (API keys/OAuth, headers, scopes) are not documented in the provided content.
Pricing
Open-source library; no pricing information is provided in the supplied README/metadata.
Agent Metadata
Known Gotchas
- ⚠ README does not document standard retry/idempotency semantics for CallTool/SearchTools; agents should be cautious with repeated tool calls.
- ⚠ If using the CodeMode plugin, LLM-driven execution increases risk; ensure sandboxing and strict input controls beyond what is stated in README.
Alternatives
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Scores are editorial opinions as of 2026-03-30.