clinicaltrials_get_field_definitions
ActiveTool of clinicaltrialsgov-mcp-server
declared in 2.8.0
Resolve valid field names from the ClinicalTrials.gov data model — the canonical PascalCase identifiers (OverallStatus, EnrollmentCount, LeadSponsorName) accepted by the `fields`, `advancedFilter`, and `sort` parameters of other tools, and as input to clinicaltrials_get_field_values. 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).
Parameters schema
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"mode"
],
"properties": {
"mode": {
"enum": [
"search",
"drill",
"overview"
],
"type": "string",
"description": "Operation mode. \"search\" — keyword search (requires `query`); \"drill\" — drill into a section by path (requires `path`); \"overview\" — list all top-level sections (no other args needed)."
},
"path": {
"type": "string",
"description": "drill mode only. Dot-notation path to drill into — e.g., \"protocolSection.designModule\", \"protocolSection.eligibilityModule\", \"resultsSection\". Returns the section's individual fields."
},
"limit": {
"type": "integer",
"default": 20,
"maximum": 100,
"minimum": 1,
"description": "search mode only. Maximum results to return. Default: 20."
},
"query": {
"type": "string",
"description": "search mode only. Keyword to search field names by — e.g., \"enrollment\", \"sponsor\", \"adverse events\". Returns matching field names ranked by relevance with their full paths and data types."
},
"includeIndexedOnly": {
"type": "boolean",
"description": "drill mode only. Only return indexed (searchable) fields. Default: false."
}
}
}Parent server
clinicaltrialsgov-mcp-server
https://github.com/cyanheads/clinicaltrialsgov-mcp-server
3/7 registries