{"server":{"name":"io.github.polygraphso/litmus","$schema":"https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json","remotes":[{"url":"https://polygraph.so/api/mcp","type":"streamable-http"}],"version":"0.36.0","packages":[{"version":"0.36.0","transport":{"type":"stdio"},"identifier":"@polygraphso/litmus","registryType":"npm","registryBaseUrl":"https://registry.npmjs.org","packageArguments":[{"type":"positional","value":"polygraphso-litmus-mcp"}],"environmentVariables":[{"name":"POLYGRAPH_API_URL","default":"https://polygraph.so","description":"Base URL for published-grade lookups (check_server, list_servers, request_grade) and attestation resolution."},{"name":"NEXT_PUBLIC_POLYGRAPH_NETWORK","default":"base","description":"Which network to read attestations from: 'base' (mainnet, default) or 'base-sepolia' (testnet)."}]}],"repository":{"url":"https://github.com/polygraphso/litmus","source":"github"},"websiteUrl":"https://polygraph.so","description":"Grade MCP servers A to F with the open behavioral litmus. npm: full toolset; hosted: lookups only."},"_meta":{"io.modelcontextprotocol.registry/official":{"status":"active","isLatest":true,"updatedAt":"2026-07-20T15:52:22.440934Z","publishedAt":"2026-07-20T15:52:22.440934Z","statusChangedAt":"2026-07-20T15:52:22.440934Z"},"dev.protogrid/connectability":{"class":"R0","autonomous":true,"human_steps":[],"preferred":{"kind":"remote","idx":0},"remotes":[{"idx":0,"url":"https://polygraph.so/api/mcp","transport":"streamable-http","templated":false,"headers":[],"auth":{"type":"none","location":null,"secret_name":null,"oauth":null},"protocol":{"supported_versions":["2025-11-25"],"stateless":true},"health":{"reachable":true,"uptime_30d":1,"latency_ms_p50":377,"consecutive_failures":0,"last_probe_at":"2026-10-19T22:56:20.570Z","last_ok_at":"2026-10-19T22:56:20.570Z"}}],"packages":[{"idx":0,"registry_type":"npm","identifier":"@polygraphso/litmus","version":"0.36.0","runtime_hint":null,"transport":"stdio","secrets":[],"requires_execution":true}]},"dev.protogrid/tools":[{"name":"check_server","title":"Check a server's published polygraph grade","description":"Read a server's published behavioral grade (A-F) from polygraph.so in under a second; no execution. The pre-flight check before recommending or installing an MCP server. On a miss it returns not_available (unevaluated: neither safe nor unsafe) with next steps.","annotations":{"readOnlyHint":true,"openWorldHint":true},"source":"probe","observed_at":"2026-10-19T22:56:20.570Z"},{"name":"list_servers","title":"List servers with a published grade","description":"Servers with a published polygraph grade, sorted A-first then by ref. Returns up to `limit` rows starting at `offset` (default limit 25, capped at 100 per call); `grade` restricts to one letter. `summary` always covers the full graded corpus (a total plus a count per grade), regardless of `grade`, `limit`, or `offset`.","annotations":{"readOnlyHint":true,"openWorldHint":true},"source":"probe","observed_at":"2026-10-19T22:56:20.570Z"},{"name":"request_grade","title":"Request a polygraph grade for an MCP server","description":"Hosted grading is discontinued. This tool returns gone. Existing published grades remain available via check_server / list_servers. 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