{"slug": "io-github-cyanheads-clinicaltrialsgov-mcp-server-io-github-cyanheads-mcp-server", "title": "io.github.cyanheads/clinicaltrialsgov-mcp-server (io.github.cyanheads/clinicaltrialsgov-mcp-server@2.9.2)", "summary": "The MCP server io.github.cyanheads/clinicaltrialsgov-mcp-server, version 2.9.2, was published to the official MCP registry on 2026-08-21, offering search of ClinicalTrials.gov to find studies, retrieve results, and match patients to eligible trials. The server is distributed as clinicaltrialsgov-mcp-server on npm and as a hosted remote over streamable-http, and it declares 8 environment variables. The mcpindex gate pins the server's tool contracts and holds calls when contract drift occurs, with a semantic screen finding no manipulation pattern in the description.", "body_md": "[← Index](/leaderboard)\n\n# io.github.cyanheads/clinicaltrialsgov-mcp-server\n\nSearch ClinicalTrials.gov — find studies, retrieve results, match patients to eligible trials.\n\nThe current version, v2.9.2, was published to the official MCP registry on 2026-08-21. It is distributed as clinicaltrialsgov-mcp-server on npm and as a hosted remote over streamable-http, filed under Search by this index, and declares 8 environment variables. Removals and unreachable sources are measured across every server this index tracks, contract drift across the servers that answer in consecutive snapshots; [the index's current counts](/stats) put this record in context.\n\n## Using io.github.cyanheads/clinicaltrialsgov-mcp-server in Claude, Cursor, Gemini CLI, Cline, or Zed?\n\nMCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and **HOLDs the call** when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use **Install this server** for that).\n\nRewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less\n\n```\nuv tool install mcpindex-gate && mcpindex-config-wire\n```\n\n[method](/methodology)\n\nSemantic screen found no manipulation pattern in the description. Conformance probe not yet run.\n\n`mcpindex.integrity.description`\n\npassINFOevidence“Declared capability, no hidden instructions”via static_description\n\n- - Semantic screen only - the deterministic conformance probe has not run on this server\n- - Confidence is reported but not yet calibrated (v1)\n- - Screen reads the tool description, not the live behavior\n- - advisory\n- - registry description only no input schema\n- - screen model 8b\n- - Still current: the description we screened is unchanged, re-checked against the registry\n- - The registry listing (version, packages, links) changed after this screen ran - the description we assessed did not\n\nSemantic screen: an LLM judge reads the tool description for hidden instructions (status PARTIAL). A pass means the description is not lying, not that the tool is safe: a high-capability tool with an honest description still warrants caution. The deterministic conformance probe has not been run on this server yet, so the screen here is semantic-only. Posture: advisory. Confidences are reported but not yet calibrated (calibrated=false at v1). Full verdict history is not shown on this page.\n\nOwn this server? [Screen its description →](/screen)\n\n## That verdict was true at screening time (snapshot 2026-08-21).\n\nContracts can change after screening, with no version bump. The gate pins io.github.cyanheads/clinicaltrialsgov-mcp-server’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday.\n\n[See your first HOLD in 2 minutes →](/guides/install-the-gate-first-hold)\n\nRelated: [how to trust an MCP server](/guides/how-to-trust-an-mcp-server) · [screen before install](/guides/screen-mcp-server-before-install) · [silent contract drift](/guides/mcp-silent-contract-drift)\n\nPeople vet a server before wiring it in. One line on your project site or docs answers that with an independent record: screening verdict, registry provenance, contract drift history. It stays current as new screens and drift events land.\n\n```\n[Independent trust record for io.github.cyanheads/clinicaltrialsgov-mcp-server](https://mcpindex.ai/server/io-github-cyanheads-clinicaltrialsgov-mcp-server) - screening verdict, registry provenance, and contract drift monitoring.\n<a href=\"https://mcpindex.ai/server/io-github-cyanheads-clinicaltrialsgov-mcp-server\">Independent trust record for io.github.cyanheads/clinicaltrialsgov-mcp-server</a> - screening verdict, registry provenance, and contract drift monitoring.\n```\n\nA live verdict badge for your README or listing. It reflects the current screen, links back here, and updates when the verdict does.\n\n```\n[![mcpindex](https://mcpindex.ai/api/v1/badge/io-github-cyanheads-clinicaltrialsgov-mcp-server)](https://mcpindex.ai/server/io-github-cyanheads-clinicaltrialsgov-mcp-server)\n<a href=\"https://mcpindex.ai/server/io-github-cyanheads-clinicaltrialsgov-mcp-server\"><img src=\"https://mcpindex.ai/api/v1/badge/io-github-cyanheads-clinicaltrialsgov-mcp-server\" alt=\"mcpindex verdict\" height=\"20\" /></a>\n```\n\n`CT_API_BASE_URL`\n\nClinicalTrials.gov API base URL.\n\n`CT_REQUEST_TIMEOUT_MS`\n\nPer-request timeout in milliseconds.\n\n`CT_MAX_PAGE_SIZE`\n\nMaximum page size cap.\n\n`MCP_LOG_LEVEL`\n\nSets the minimum log level for output (e.g., 'debug', 'info', 'warn').\n\n`CT_API_BASE_URL`\n\nClinicalTrials.gov API base URL.\n\n`CT_REQUEST_TIMEOUT_MS`\n\nPer-request timeout in milliseconds.\n\n`CT_MAX_PAGE_SIZE`\n\nMaximum page size cap.\n\n`MCP_HTTP_HOST`\n\nThe hostname for the HTTP server.\n\n`MCP_HTTP_PORT`\n\nThe port to run the HTTP server on.\n\n`MCP_HTTP_ENDPOINT_PATH`\n\nThe endpoint path for the MCP server.\n\n`MCP_AUTH_MODE`\n\nAuthentication mode to use: 'none', 'jwt', or 'oauth'.\n\n`MCP_LOG_LEVEL`\n\nSets the minimum log level for output (e.g., 'debug', 'info', 'warn').\n\n[methodology](/methodology)\n\n[YTDL RMCPai.dinglebear/rytdl](/server/ai-dinglebear-rytdl)\n\nyt-dlp search, download, metadata, delivery, and Plex workflows over MCP and CLI.\n\n[Fodda Topic & Trend Researchai.fodda/topic-research](/server/ai-fodda-topic-research)\n\nTrend, stats & insight search across PSFK expert graphs with citable sources.\n\n[io.github.cyanheads/college-scorecard-mcp-serverio.github.cyanheads/college-scorecard-mcp-server](/server/io-github-cyanheads-college-scorecard-mcp-server)\n\nSearch, compare, and analyze U.S. college data — costs, earnings, programs, and outcomes.", "url": "https://wpnews.pro/news/io-github-cyanheads-clinicaltrialsgov-mcp-server-io-github-cyanheads-mcp-server", "canonical_source": "https://mcpindex.ai/server/io-github-cyanheads-clinicaltrialsgov-mcp-server", "published_at": "2026-08-21 22:39:28+00:00", "updated_at": "2026-08-21 23:13:45.215246+00:00", "lang": "en", "topics": ["ai-tools"], "entities": ["io.github.cyanheads/clinicaltrialsgov-mcp-server", "ClinicalTrials.gov", "mcpindex", "npm"], "alternates": {"html": "https://wpnews.pro/news/io-github-cyanheads-clinicaltrialsgov-mcp-server-io-github-cyanheads-mcp-server", "markdown": "https://wpnews.pro/news/io-github-cyanheads-clinicaltrialsgov-mcp-server-io-github-cyanheads-mcp-server.md", "text": "https://wpnews.pro/news/io-github-cyanheads-clinicaltrialsgov-mcp-server-io-github-cyanheads-mcp-server.txt", "jsonld": "https://wpnews.pro/news/io-github-cyanheads-clinicaltrialsgov-mcp-server-io-github-cyanheads-mcp-server.jsonld"}}