Clinicaltrialsgov MCP Server

clinicaltrialsgov-mcp-server Search ClinicalTrials.gov trials, retrieve study details and results, and match patients to candidate trials via MCP. STDIO or Streamable HTTP. 7 Tools • 1 Resource • 1 Prompt

Public Hosted Server: https://clinicaltrials.caseyjhand.com/mcp

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Overview

Clinical trial data from the ClinicalTrials.gov REST API v2 — the US National Library of Medicine's registry of 600K+ clinical trial studies. Search trials, fetch full study records and posted results, discover field names and valid values, and match patient demographics to candidate recruiting trials. Public, read-only, no authentication required. Runs as a stdio process, a local Streamable HTTP server, or the public hosted endpoint above.

Tools

Tool	Description
clinicaltrials_search_studies	Search studies with full-text and field-specific queries, status/phase/geographic filters, pagination, sorting, and field selection
clinicaltrials_get_study_record	Fetch a single study by NCT ID — full protocol record with optional location/outcome/reference caps
clinicaltrials_get_study_count	Fast total study count for a query, without fetching data
clinicaltrials_get_field_values	Discover valid values for API fields, with per-value study counts
clinicaltrials_get_field_definitions	Resolve valid field names — keyword search, path drill-down, or top-level overview
clinicaltrials_get_study_results	Fetch posted results — outcomes, adverse events, participant flow, baseline — for completed studies
clinicaltrials_find_eligible	Match patient demographics and conditions to candidate recruiting trials, without checking inclusion/exclusion criteria

Resources

Resource	Description
clinicaltrials://{nctId}	Fetch a single clinical study by NCT ID as JSON, with capped lists and results replaced by counts

Prompts

Prompt	Description
analyze_trial_landscape	Guides a data-driven clinical trial landscape analysis using the count and search tools

Capability reference

clinicaltrials_search_studies tool

• Free-text query plus field-specific conditionQuery / interventionQuery / locationQuery / sponsorQuery / titleQuery / outcomeQuery, statusFilter / phaseFilter enums (case and spacing variants accepted; a phaseFilter entry that names no phase, such as an OR expression, fails as enum_invalid), advancedFilter (AREA[FieldName]value / RANGE[min, max]), and geoFilter (distance(lat,lon,radius) with a mi/km suffix); pageSize 1–200 (default 10), pageToken cursor, sort on up to 2 fields
• Returns a compact per-study index by default (nctId, briefTitle, overallStatus, phases, enrollmentCount, hasResults, …); fields (PascalCase leaves) selects a full-fidelity projection — full records run ~70KB
• Typed errors: blank_value, ids_not_found, field_invalid, enum_invalid, query_parse_error, geo_invalid, sort_invalid, page_token_invalid, rate_limited

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clinicaltrials_get_study_record tool