> ## Documentation Index
> Fetch the complete documentation index at: https://docs.stackone.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ClinicalTrials.gov Changelog

> Release history for the ClinicalTrials.gov connector. Each version lists what changed and which actions were affected.

<Card title="ClinicalTrials.gov connector" icon="arrow-left" href="/connectors/clinicaltrialsgov" horizontal>
  Back to the connector overview, authentication methods, and actions.
</Card>

<Update label="v1.1.0" description="16 Sept 2026">
  `data-sync`

  Added scheduled data sync to five reference collections — the study data model and search areas, the enumeration catalogue, and the field value and field size statistics — so these can be kept in sync and searched without calling ClinicalTrials.gov on every request. Each is returned in full by a single request and syncs by full refresh, because ClinicalTrials.gov offers no last-updated filter.

  <AccordionGroup>
    <Accordion title="Changed · 5 actions updated">
      `clinicaltrialsgov_get_studies_metadata`, `clinicaltrialsgov_list_field_sizes_stats`, `clinicaltrialsgov_list_field_values_stats`, `clinicaltrialsgov_list_study_enums`, `clinicaltrialsgov_list_study_search_areas`
    </Accordion>
  </AccordionGroup>
</Update>

<Update label="v1.0.1" description="30 Jul 2026">
  `bug-fix`

  Clarified list\_studies descriptions from MCP behavioural testing — query\_cond/query\_intr search expansion, valid fields (400 on unknown), agg\_filters facet catalog (studyType/ages/phase), subset-count via count\_total, and response-size guidance; noted list\_field\_sizes\_stats unsupported fields.
</Update>