clinicaltrialsgov-mcp-server

io.github.cyanheads/clinicaltrialsgov-mcp-serverVersion 2.11.3

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

Status

Responds547 msNov 14, 2026, 14:48 UTCAnswered our handshake without sign-in.

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Last checked: Nov 14, 2026, 14:48 UTC
Latency: 547 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 22:14 UTC

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Connect

Streamable HTTP

https://clinicaltrials.caseyjhand.com/mcpResponds547 msNov 14, 2026, 14:48 UTC

No sign-in

Claude Code

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

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: clinicaltrialsgov-mcp-server
Remote MCP server URL: https://clinicaltrials.caseyjhand.com/mcp

Cursor

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

VS Code

code --add-mcp '{"name":"clinicaltrialsgov-mcp-server","type":"http","url":"https://clinicaltrials.caseyjhand.com/mcp"}'

Streamable HTTP

npm: clinicaltrialsgov-mcp-server 2.11.3

Package only

npm (npx)

claude mcp add clinicaltrialsgov-mcp-server -- npx -y clinicaltrialsgov-mcp-server@2.11.3

Streamable HTTP

npm: clinicaltrialsgov-mcp-server 2.11.3

Package only

npm (npx)

claude mcp add clinicaltrialsgov-mcp-server -- npx -y clinicaltrialsgov-mcp-server@2.11.3

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Tools

7 tools

Tools of clinicaltrialsgov-mcp-server
	Description		Read-only	Idempotent	Open world
`clinicaltrials_find_eligible`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 search only — inclusion/exclusion criteria are not checked, and a candidate can exclude the requested condition, so review each one's criteria with clinicaltrials_get_study_record before treating it as a match. Results are re-ranked so studies whose own condition matches a requested condition surface above tangential matches from ClinicalTrials.gov's fuzzy condition search. Each candidate returns only the sites matching the requested location (capped by locationLimit), not the study's full registered site list — a large trial can register hundreds of sites worldwide. When none of a candidate's matched sites is recruiting, one recruiting site is added so an enrollable site is never hidden behind a closer closed one: the one nearest the matched sites by their published coordinates, in the requested country whenever a site there recruits, carrying distanceMi, or the first in match order when coordinates are missing. Fetch a study's complete record with clinicaltrials_get_study_record.	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 search only — inclusion/exclusion criteria are not checked, and a candidate can exclude the requested condition, so review each one's criteria with clinicaltrials_get_study_record before treating it as a match. Results are re-ranked so studies whose own condition matches a requested condition surface above tangential matches from ClinicalTrials.gov's fuzzy condition search. Each candidate returns only the sites matching the requested location (capped by locationLimit), not the study's full registered site list — a large trial can register hundreds of sites worldwide. When none of a candidate's matched sites is recruiting, one recruiting site is added so an enrollable site is never hidden behind a closer closed one: the one nearest the matched sites by their published coordinates, in the requested country whenever a site there recruits, carrying distanceMi, or the first in match order when coordinates are missing. Fetch a study's complete record with clinicaltrials_get_study_record.	Not declared	Yes	Yes	Yes
`clinicaltrials_get_field_definitions`Resolve valid field names from the ClinicalTrials.gov data model — the canonical PascalCase identifiers (OverallStatus, EnrollmentCount, LeadSponsorName) the other tools take. Every record piece works in clinicaltrials_search_studies `fields`; a leaf piece (sourceType other than STRUCT) also works in `AREA[…]` expressions in `advancedFilter` and the query parameters, and as input to clinicaltrials_get_field_values (LocationGeoPoint aside); a leaf of a date or integer type (NormalizedDate, PartialDate, DateTimeMinutes, integer, long, short) also works in `sort`. An index-only piece (drill with includeIndexedOnly, e.g. NumLocations) works wherever a leaf does except `fields`. Select a mode: `"search"` — keyword search returning ranked matches (pass `query`, e.g. "enrollment", "sponsor", "adverse events"); `"drill"` — drill into a specific section by dot-notation path (pass `path`, e.g. "protocolSection.designModule"); `"overview"` — top-level summary of all sections (no additional args).	Resolve valid field names from the ClinicalTrials.gov data model — the canonical PascalCase identifiers (OverallStatus, EnrollmentCount, LeadSponsorName) the other tools take. Every record piece works in clinicaltrials_search_studies `fields`; a leaf piece (sourceType other than STRUCT) also works in `AREA[…]` expressions in `advancedFilter` and the query parameters, and as input to clinicaltrials_get_field_values (LocationGeoPoint aside); a leaf of a date or integer type (NormalizedDate, PartialDate, DateTimeMinutes, integer, long, short) also works in `sort`. An index-only piece (drill with includeIndexedOnly, e.g. NumLocations) works wherever a leaf does except `fields`. Select a mode: `"search"` — keyword search returning ranked matches (pass `query`, e.g. "enrollment", "sponsor", "adverse events"); `"drill"` — drill into a specific section by dot-notation path (pass `path`, e.g. "protocolSection.designModule"); `"overview"` — top-level summary of all sections (no additional args).	Not declared	Yes	Yes	Yes
`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.	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.	Not declared	Yes	Yes	Yes
`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).	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).	Not declared	Yes	Yes	Yes
`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. Optional locationLimit / outcomeLimit / referenceLimit / nearLocation parameters trim locations, outcomes, and references — original totals are preserved in `filtersApplied` only when a cap actually trims the set.	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 locations, outcomes, and references — original totals are preserved in `filtersApplied` only when a cap actually trims the set.	Not declared	Yes	Yes	Yes
`clinicaltrials_get_study_results`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 available for studies where hasResults is true. Use clinicaltrials_search_studies first to find studies with results. Each call fetches up to 20 distinct NCT IDs and returns any further IDs in deferredNctIds for a follow-up call. A results-rich record can exceed 500KB per study in full mode — bound it with summary=true, narrower sections, or the outcomeLimit / adverseEventLimit caps; outcomeLimit / outcomeOffset also page summarized outcomes. A bounded list is resumable: outcomeOffset / seriousEventOffset / otherEventOffset start the next window, and each study's filtersApplied reports what was trimmed and the next offset for every list left short. A previous (alias) NCT ID resolves to its canonical study, named in canonicalNctId.	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 available for studies where hasResults is true. Use clinicaltrials_search_studies first to find studies with results. Each call fetches up to 20 distinct NCT IDs and returns any further IDs in deferredNctIds for a follow-up call. A results-rich record can exceed 500KB per study in full mode — bound it with summary=true, narrower sections, or the outcomeLimit / adverseEventLimit caps; outcomeLimit / outcomeOffset also page summarized outcomes. A bounded list is resumable: outcomeOffset / seriousEventOffset / otherEventOffset start the next window, and each study's filtersApplied reports what was trimmed and the next offset for every list left short. A previous (alias) NCT ID resolves to its canonical study, named in canonicalNctId.	Not declared	Yes	Yes	Yes
`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. Returns a compact per-study index by default; pass the fields parameter to get specific leaves at full fidelity — full study records are ~70KB each.	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 study records are ~70KB each.	Not declared	Yes	Yes	Yes

Details

Registry status: Active
Published: Nov 13, 2026
Updated: Nov 13, 2026
Website: Not given
Repository: https://github.com/cyanheads/clinicaltrialsgov-mcp-server⁠ (opens in a new tab)
Categories (suggested): Search and webSuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared

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