docs/en/integrations/knowledge-catalog/tools/knowledge-catalog-discover-metadata.md
A dataplex-discover-metadata tool triggers a new Data Discovery scan to automatically crawl GCS directories, infer schemas/partitions, and publish them as BigQuery tables.
Since scan template creation is asynchronous, this tool returns an LRO name. You must poll dataplex-get-operation with this ID until it is done, extract the scanId, and poll dataplex-get-run-status with the scanId until the job is SUCCEEDED before calling dataplex-get-discovery-results to fetch results.
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Knowledge Catalog uses Identity and Access Management (IAM) to control user and group access to Knowledge Catalog resources. Toolbox will use your Application Default Credentials (ADC) to authorize and authenticate when interacting with [Knowledge Catalog][dataplex-docs].
In addition to setting the ADC for your server, you need to ensure the IAM identity has been given the correct IAM permissions for the tasks you intend to perform. See Knowledge Catalog IAM permissions and Knowledge Catalog IAM roles for more information on applying IAM permissions and roles to an identity.
The dataplex-discover-metadata tool accepts the following parameters:
| field | type | required | description |
|---|---|---|---|
| resourcePath | string | true | The resource path of the target Cloud Storage bucket (format: //storage.googleapis.com/{bucket_name}). |
| location | string | true | The Google Cloud region where the scan should be executed (e.g. us-central1). |
kind: tool
name: discover_metadata
type: dataplex-discover-metadata
source: my-dataplex-source
description: Trigger a new metadata discovery scan.
| field | type | required | description |
|---|---|---|---|
| type | string | true | Must be "dataplex-discover-metadata". |
| source | string | true | Name of the source the tool should execute on. |
| description | string | true | Description of the tool that is passed to the LLM. |