# Cyanheads Clinicaltrialsgov MCP server

Source: https://glimind.com/server/mcp-registry%2Fio.github.cyanheads%2Fclinicaltrialsgov-mcp-server
Registry id: `mcp-registry/io.github.cyanheads/clinicaltrialsgov-mcp-server`
Status: live (checked 2026-10-27T00:27:36.833Z)

## Verdict

Cyanheads Clinicaltrialsgov MCP server answered 99.77% of Glimind's liveness checks over 30 days, better than 23% of MCP servers, with 497 ms median handshake and 17 outages in 90 days. Its agent-readiness grade is A (94/100) across 7 tools, costing an agent about 8,988 tokens to load. Checked every few minutes; no tool is ever called.

## Measurements (30 days)

| Metric | Value | Better than |
|---|---|---|
| Uptime, 30 days | 99.77% | 23% of MCP servers |
| Median handshake latency | 497 ms | 50% of MCP servers |
| p95 handshake latency | 2407 ms | — |
| Checks in 30 days | 4,931 | — |
| Outages, 90 days | 17 | — |
| Median recovery | 6 min | — |
| Agent-readiness score | 94/100 (A) | 78% of MCP servers |
| Tools | 7 | — |
| Tool-list size for an agent | ~8,988 tokens | 32% of MCP servers |
| Days observed | 29 | — |

## Install

```json
{
  "mcpServers": {
    "cyanheads-clinicaltrialsgov-mcp-server": {
      "type": "http",
      "url": "https://clinicaltrials.caseyjhand.com/mcp"
    }
  }
}
```

Claude Code:

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

## Tools (7)

- `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 informati
- `clinicaltrials_get_field_definitions`: Resolve valid field names from the ClinicalTrials.gov data model — the canonical PascalCase identifiers (OverallStatus, EnrollmentCount, LeadSponsorName) accept
- `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 
- `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
- `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,
- `clinicaltrials_get_study_results`: Fetch clinical trial results data from ClinicalTrials.gov for completed studies — outcome measures with statistics, adverse events, participant flow, baseline c
- `clinicaltrials_search_studies`: Search for clinical trial studies from ClinicalTrials.gov. Supports full-text and field-specific queries, status/phase/geographic filters, pagination, sorting, 

Measured by Glimind (https://glimind.com): MCP handshake + tool list only, no tool is ever called. CC BY 4.0.