joern-mcp-server (effortlessdevsec/joern-mcp-server) is an MCP server listed on the M8ven Trust Index. M8ven has not graded it: there is no public source to read and no endpoint we can reach, so there is nothing for us to inspect. No publisher has claimed this listing.
Joern Advanced MCP Server MCP (Model Context Protocol) server that exposes **Joern** code analysis as tools: import code, query dataflows, list methods, dump AST/CFG/PDG, and run scans.
Emerging. No concerning findings. Grades remain capped until the project builds reputation through adoption. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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effortlessdevsec
Source: github_code
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Install from
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JOERN_HOMEJoern Installed; should point at the install (contains joern-cli/) for spawn pathsJOERN_MCP_DEBUGVerbose debugging — =1 logs routing, HTTP timing, and spawn argv on stderr onlyJOERN_MCP_DEBUG_QUERY_MAXMax chars of query in debug previews (default 2000)JOERN_MCP_FORCE_SPAWNForce joern --script even if URL is setJOERN_MCP_HTTP_ONLYStrict HTTP mode — =1 blocks spawn for scripts; CLI-only tools error (see [BACKEND.md](./BACKEND.md))JOERN_SERVER_BASIC_PASSJOERN_SERVER_BASIC_USERJOERN_SERVER_PASSWORDJOERN_SERVER_USER / Basic auth for HTTP (see BACKEND for aliases)JOERN_SERVER_TIMEOUT_MS/query-sync timeout (default 300000)JOERN_SERVER_URLHTTP-first — With , script tools send CPGQL in memory to /query-sync (no joern --script subprocess per call)JOERN_SERVER_USER/ JOERN_SERVER_PASSWORD Basic auth for HTTP (see BACKEND for aliases)Tool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
18/18 tools missing one or more hints — joern_dump_graphs (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); joern_export (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); joern_find_calls (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +15 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Tool handlers catch errors
Only 1/16 tool handlers wrap calls in try/catch (6%)
Wrap each tool handler body in try/catch and return a structured error response.
Tests exist
No test files found
Add tests that exercise each declared tool.
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