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Java/Spring Boot MCP server for TypeSafe Jev
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Jev directory
CommunityJev Agents & MCP
Jev MCP Server (Spring)
A Java/Spring Boot MCP server that exposes Jev as typed-judgment tools — jev_classify, jev_score, jev_check, jev_gate and jev_health — over HTTP (Streamable/SSE), for MCP clients that reach a running service instead of spawning a stdio subprocess.
- Stars
- 2
- Language
- Java
- License
- APACHE-2.0
- Reading time
- 3 min
- Published by
- Community
- Author
- ashfaqbs
- Last verified
- Oct 2026
Used inJev for Software & DevTools
- Languages
- Java
- Capabilities
- Open sourceSelf-hostedRequires API key
Highlights
- Five tools: jev_classify returns a label; jev_score rates against a rubric; jev_check answers yes/no; jev_gate gates a patch; jev_health checks connectivity.
- jev_gate verifies completion claims against a diff and evidence, scores merge risk, and returns per-claim verdicts plus a pass/review decision.
- On failure a tool call fails at the MCP protocol level (isError: true) with a short, safe message — no response body or stack trace is echoed back.
- The README calls it the first Java-based MCP server for Jev as far as its author found; other jev-mcp projects cover Python/stdio and TypeScript/npm.
- Wires jev-spring-boot-starter into Spring AI's MCP server support: Java 17+, a TYPESAFE_API_KEY, and the server on port 8080 with the MCP endpoint at /mcp.
Quickstart
bash
export TYPESAFE_API_KEY=your-key
./mvnw spring-boot:runWatch out
Copy reviewed against the repo README on 2026-10-15; it was truncated in the dependency note, so later sections were not inspected. The 'first Java-based MCP server for Jev' claim is the author's own. The project states it is independent and not affiliated with TypeSafe, and you must hold your own TypeSafe account and API key.
Questions about this entry
Short answers drawn from the linked project or page.
A Java/Spring Boot MCP server that exposes TypeSafe Jev as typed-judgment tools over HTTP (Streamable or SSE), for MCP clients that can reach a running service rather than spawn a local stdio subprocess. It is an independent community project, not affiliated with TypeSafe AI.
Five. jev_classify puts a state into one of the given labels with confidence and probabilities; jev_score rates a state against an ordered rubric; jev_check answers a reusable yes/no question with a flag/uncertain/clear band; jev_gate gates a patch before merge; and jev_health resolves the model and round-trip latency.
The author describes it as the first Java-based MCP server for Jev: blakestone-x/jev-mcp covers Python/stdio and jkudish/jev-mcp covers TypeScript/npm with a broader ten-tool surface. This project covers a subset over HTTP, closing the gap for the Java/Spring side and for clients that want an endpoint instead of a spawned process.
Requires Java 17 or newer and a TYPESAFE_API_KEY. Export the key, then run ./mvnw spring-boot:run; the server starts on port 8080 with the MCP endpoint at /mcp. Point an HTTP-capable MCP client at http://localhost:8080/mcp.
No. You must hold your own valid TypeSafe account and API key, and you are responsible for using it under TypeSafe's terms. The project only forwards calls made with credentials you supply — it does not provide, proxy or resell access on anyone else's behalf.
The tool call fails at the MCP protocol level with isError: true and a short, safe message. No response body or stack trace is ever echoed back to the client.
Three tools are tracked as follow-ups rather than silently missing: jev_ask (the fully generic, mixed-question-type call), jev_match (best-candidate search with abstention) and jev_screen (prompt-injection screening). The README points to the other jev-mcp implementations as references for adding them.
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