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Search and analyze clinical trials via the ClinicalTrials.gov v2 API
Passed 23 of 23 test cases with the skill, and 20 of 23 without it.
3 fixed20 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 3 test cases the skill fixed. Same model, same prompt, with and without the skill.
I want to query ClinicalTrials.gov v2 for all studies where Pfizer is listed as sponsor or collaborator. Which parameter name should be used in the URL query string?
| Checked | Without skill | With skill |
|---|---|---|
| Uses query.spons for sponsor or collaborator filtering. | Missed | Passed |
| Applies sponsor filtering via parameter instead of full-text search. | Passed | Passed |
The instructions your model reads when the skill loads.
ClinicalTrials.gov is the world's largest clinical trial registry, maintained by the U.S. National Library of Medicine (NLM) at NIH. It contains over 576,000 study records from 220+ countries covering interventional trials, observational studies, and expanded access programs. The v2 API provides structured JSON access with field-level filtering, cursor-based pagination, and statistics endpoints.
Key v2 improvements over the legacy API: JSON-native responses, sparse field selection via the fields parameter, nextPageToken pagination, and dedicated statistics endpoints. Study data is organized into protocolSection (sponsor-submitted) and derivedSection (NLM-computed).
No authentication required. All endpoints are publicly accessible without API keys or registration. Users should comply with NCBI usage policies and maintain reasonable request rates.
GET https://clinicaltrials.gov/api/v2/studies| Parameter | Type | Required | Description |
|---|---|---|---|
| query.term | string | No | Free-text search across all fields |
| query.cond | string | No | Condition or disease filter |
| query.intr | string | No | Intervention or treatment filter |
| query.spons | string | No | Sponsor or collaborator filter |
| filter.overallStatus | string | No | RECRUITING, COMPLETED, ACTIVE_NOT_RECRUITING, etc. |
| filter.phase | string | No | EARLY_PHASE1, PHASE1, PHASE2, PHASE3, PHASE4, NA |
| filter.geo | string | No | Geographic filter (distance(lat,lng,dist)) |
| fields | string | No | Comma-separated fields for sparse response |
| sort | string | No | Sort field and direction (e.g., LastUpdatePostDate:desc) |
| pageSize | int | No | Results per page (default 10, max 1000) |
| pageToken | string | No | Cursor token for next page |
| format | string | No | json (default) or csv |
curl "https://clinicaltrials.gov/api/v2/studies?query.cond=diabetes&query.intr=metformin&pageSize=1&fields=NCTId,BriefTitle,OverallStatus"
test cases passed, vs 20 / 23 without
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