custom-mcp-server
A learning-oriented MCP (Model Context Protocol) server implemented in Java. It communicates over stdio using JSON-RPC 2.0, supports the MCP initialize handshake, lists tools via tools/list, and executes a basic tool via tools/call (with an echo example).
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Transport is stdio (not TLS). The README does not mention authentication, authorization, or scoping. Planned error handling/logging suggests current operational and security hardening may be incomplete. Dependency hygiene cannot be verified from README; only that Spring Boot/Jackson/Lombok are used.
⚡ Reliability
Best When
You want a small reference implementation to understand MCP interactions end-to-end (server <-> client via stdio).
Avoid When
You need comprehensive MCP feature coverage (resources/prompts), documented operational behavior, strong security controls, or predictable reliability under failure.
Use Cases
- • Learning MCP server basics (initialize, tools/list, tools/call)
- • Building a simple local MCP server for experimentation
- • Prototyping tool-calling flows over stdio with JSON-RPC 2.0
Not For
- • Production-grade MCP deployments
- • Security-sensitive environments without review/hardening
- • Use cases requiring robust error handling, logging, resources, or prompts
Interface
Authentication
No authentication/authorization mechanism is described in the README. For stdio-local use this may be acceptable for learning, but it is not appropriate for untrusted multi-tenant environments without additional controls.
Pricing
Open-source (MIT) with no hosted pricing model described.
Agent Metadata
Known Gotchas
- ⚠ Only a basic tool set is described (echo example). Agents should not expect resources/prompts or extended tool implementations to be available.
- ⚠ Planned features include error handling and logging; current behavior under failures may be limited.
- ⚠ No rate-limit, timeout, or retry behavior is documented; agents may need conservative pacing and robust handling of malformed/failed responses.
Alternatives
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Scores are editorial opinions as of 2026-04-04.