zeromcp
zeromcp is a minimal, zero-dependency (stdlib-only) Python implementation of the Model Context Protocol (MCP) that lets you expose typed Python functions as MCP tools/resources/prompts, and serve them over HTTP/SSE or over stdio.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
The library is described as zero-dependency (stdlib-only), which generally reduces dependency/CVE risk. However, the README does not document transport security requirements (e.g., TLS enforcement for the HTTP server), authentication/authorization, or scope granularity. CORS defaults to localhost origins on any port (and can be set to '*'), which could be dangerous if the server is reachable from untrusted networks. Secret-handling practices are not described in the provided content.
⚡ Reliability
Best When
You want a small, pure-Python MCP server for local or controlled environments, with tool schemas derived from native Python type hints.
Avoid When
You need strong built-in access control, audited security features, or documented rate limiting/SLA-style operational guarantees.
Use Cases
- • Expose internal Python capabilities to MCP-compatible AI clients as typed tools
- • Build lightweight local MCP servers for development/testing (e.g., inspector)
- • Provide structured outputs from Python (TypedDict/Pydantic-like typing via Annotated) to MCP clients
- • Serve read-only data and prompt templates through MCP resources/prompts
Not For
- • Production deployments needing enterprise-grade security controls or authentication
- • Use-cases requiring robust pagination, complex data streaming semantics beyond basic MCP
- • Workloads where CORS/security hardening must be centrally managed and tightly scoped
Interface
Authentication
README does not describe authentication/authorization for the HTTP/SSE or stdio transports. A consumer should assume it may be unauthenticated unless the code provides additional controls not shown in the provided content.
Pricing
Open-source library; pricing is not described in the provided content.
Agent Metadata
Known Gotchas
- ⚠ CORS defaults to allowing localhost origins on any port; this is browser-relevant and may be risky if exposed beyond local use.
- ⚠ HTTP endpoint preference is mentioned, but some MCP clients may not support /mcp consistently.
- ⚠ No auth/rate-limit behavior is described in the provided README, so agents should assume they may need to enforce network/access controls externally.
Alternatives
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Scores are editorial opinions as of 2026-03-30.