# clinicaltrialsgov-mcp-server MCP server

ClinicalTrials.gov MCP server. Search studies, retrieve results, match patients to eligible trials.

## Links
- Registry page: https://www.getdrio.com/mcp/io-github-cyanheads-clinicaltrialsgov-mcp-server
- Repository: https://github.com/cyanheads/clinicaltrialsgov-mcp-server

## Install
- Command: `npx -y clinicaltrialsgov-mcp-server`
- Endpoint: https://clinicaltrials.caseyjhand.com/mcp
- Auth: Not captured

## Setup notes
- Package: Npm clinicaltrialsgov-mcp-server v2.4.8
- Environment variable: CT_API_BASE_URL (default https://clinicaltrials.gov/api/v2)
- Environment variable: CT_REQUEST_TIMEOUT_MS (default 30000)
- Environment variable: CT_MAX_PAGE_SIZE (default 200)
- Environment variable: MCP_LOG_LEVEL (default info)
- Package: Npm clinicaltrialsgov-mcp-server v2.4.8
- Environment variable: CT_API_BASE_URL (default https://clinicaltrials.gov/api/v2)
- Environment variable: CT_REQUEST_TIMEOUT_MS (default 30000)
- Environment variable: CT_MAX_PAGE_SIZE (default 200)
- Environment variable: MCP_HTTP_HOST (default 127.0.0.1)
- Environment variable: MCP_HTTP_PORT (default 3010)
- Environment variable: MCP_HTTP_ENDPOINT_PATH (default /mcp)
- Environment variable: MCP_AUTH_MODE (default none)
- Environment variable: MCP_LOG_LEVEL (default info)
- Remote endpoint: https://clinicaltrials.caseyjhand.com/mcp

## Tools
- clinicaltrials_search_studies (Clinicaltrials Search Studies) - Search for clinical trial studies from ClinicalTrials.gov. Supports full-text and field-specific queries, status/phase/geographic filters, pagination, sorting, and field selection. Use the fields parameter to reduce payload size — full study records are ~70KB each. Endpoint: https://clinicaltrials.caseyjhand.com/mcp
- clinicaltrials_get_study_record (Clinicaltrials Get Study Record) - 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. Endpoint: https://clinicaltrials.caseyjhand.com/mcp
- clinicaltrials_get_study_count (Clinicaltrials Get Study Count) - 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 a condition). Endpoint: https://clinicaltrials.caseyjhand.com/mcp
- clinicaltrials_get_field_values (Clinicaltrials Get Field Values) - 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. Endpoint: https://clinicaltrials.caseyjhand.com/mcp
- clinicaltrials_get_field_definitions (Clinicaltrials Get Field Definitions) - Discover valid field names from the ClinicalTrials.gov data model. Call this FIRST when you need to know which field names to use in `fields`, `advancedFilter`, or `sort` parameters of other tools, or as input to clinicaltrials_get_field_values. Three usage modes: pass `query` for keyword search by concept (e.g., "enrollment", "sponsor", "adverse events") returning a ranked list of matches; pass `path` for drill-down into a section by dot-notation (e.g., "protocolSection.designModule") returning its individual fields; omit both for a top-level overview of all sections. Returns canonical PascalCase identifiers like OverallStatus, EnrollmentCount, LeadSponsorName — the exact names the API accepts. Endpoint: https://clinicaltrials.caseyjhand.com/mcp
- clinicaltrials_get_study_results (Clinicaltrials Get Study Results) - Fetch clinical trial results data from ClinicalTrials.gov for completed studies — outcome measures with statistics, adverse events, participant flow, and baseline characteristics. Only available for studies where hasResults is true. Use clinicaltrials_search_studies first to find studies with results. Endpoint: https://clinicaltrials.caseyjhand.com/mcp
- clinicaltrials_find_eligible (Clinicaltrials Find Eligible) - Match patient demographics and conditions to eligible recruiting clinical trials. Provide age, sex, conditions, and location to find studies with matching eligibility criteria, contact information, and recruiting locations. Endpoint: https://clinicaltrials.caseyjhand.com/mcp

## Resources
Not captured

## Prompts
- analyze_trial_landscape - Guides analysis of a clinical trial landscape using the ClinicalTrials.gov MCP tools. Adaptable workflow for breakdowns by status, phase, sponsor, geography, etc. Arguments: topic, focusAreas

## Metadata
- Owner: io.github.cyanheads
- Version: 2.4.8
- Runtime: Npm
- Transports: STDIO, HTTP
- License: Not captured
- Language: Not captured
- Stars: Not captured
- Updated: May 16, 2026
- Source: https://registry.modelcontextprotocol.io