MCP server

Clinicaltrialsgov

io.github.cyanheads/clinicaltrialsgov-mcp-server

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Search ClinicalTrials.gov: find studies, retrieve results, match patients to candidate trials.

Source

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

7

Token cost

About 9,654 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http clinicaltrialsgov-mcp-server https://clinicaltrials.caseyjhand.com/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.clinicaltrialsgov-mcp-server]
url = "https://clinicaltrials.caseyjhand.com/mcp"

Gemini CLI

{"mcpServers":{"clinicaltrialsgov-mcp-server":{"httpUrl":"https://clinicaltrials.caseyjhand.com/mcp"}}}

Cursor

{"mcpServers":{"clinicaltrialsgov-mcp-server":{"url":"https://clinicaltrials.caseyjhand.com/mcp"}}}

VS Code

{"servers":{"clinicaltrialsgov-mcp-server":{"type":"http","url":"https://clinicaltrials.caseyjhand.com/mcp"}}}

Antigravity

agy mcp add clinicaltrialsgov-mcp-server https://clinicaltrials.caseyjhand.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"clinicaltrialsgov-mcp-server","server_url":"https://clinicaltrials.caseyjhand.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"clinicaltrialsgov-mcp-server","server_url":"https://clinicaltrials.caseyjhand.com/mcp"}

Tools

• clinicaltrials_find_eligible ~1460 tokens
  Find candidate clinical trials for a patient profile. Provide age, sex, conditions, and location to get studies with their demographic limits, contact information, and recruiting locations. Candidates are matched on age, sex, location, recruitment status, and ClinicalTrials.gov's fuzzy condition sea
• clinicaltrials_get_field_definitions ~546 tokens
  Resolve valid field names from the ClinicalTrials.gov data model — the canonical PascalCase identifiers (OverallStatus, EnrollmentCount, LeadSponsorName) accepted by the `fields`, `advancedFilter`, and `sort` parameters of other tools, and as input to clinicaltrials_get_field_values. Select a mode:
• clinicaltrials_get_field_values ~290 tokens
  Discover valid values for ClinicalTrials.gov fields with study counts per value. Use to explore available filter options before building a search — e.g., valid OverallStatus, Phase, InterventionType, StudyType, or LeadSponsorClass values.
• clinicaltrials_get_study_count ~1899 tokens
  Get total clinical trial study count from ClinicalTrials.gov matching a query, without fetching study data. Fast and lightweight. Use for quick statistics or to build breakdowns by calling multiple times with different filters (e.g., count by phase, count by status, count recruiting vs completed for
• clinicaltrials_get_study_record ~852 tokens
  Fetch a single clinical trial study by NCT ID from ClinicalTrials.gov. Returns the full study record including protocol details, eligibility criteria, outcomes, arms, interventions, contacts, and locations. Optional locationLimit / outcomeLimit / referenceLimit / nearLocation parameters trim locatio
• clinicaltrials_get_study_results ~1852 tokens
  Fetch clinical trial results data from ClinicalTrials.gov for completed studies — outcome measures with statistics, adverse events, participant flow, baseline characteristics, and results metadata (limitations & caveats, certain-agreement disclosure restrictions, results point of contact). Only avai
• clinicaltrials_search_studies ~2755 tokens
  Search for clinical trial studies from ClinicalTrials.gov. Supports full-text and field-specific queries, status/phase/geographic filters, pagination, sorting, and field selection. Returns a compact per-study index by default; pass the fields parameter to get specific leaves at full fidelity — full

Browse

• GitHub tools
• Hiring and jobs
• GitHub and code hosting
• Government and public data
• Health and medicine

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