datalineage-search-lineage

About

A datalineage-search-lineage tool retrieves lineage links (representing data flow between source and target assets) by performing a breadth-first search in the given direction.

It supports both entity-level and column-level lineage (CLL).

Compatible Sources

Requirements

IAM Permissions

To retrieve lineage links, the authorized Google Cloud identity must have the following permissions:

• datalineage.events.get on the project where the link is stored (for entity-level lineage).
• datalineage.events.getFields on the project where the link is stored (for column-level lineage).
• datalineage.processes.get on the project where the process is stored (if retrieving process details).

Parameters

locations (Array of Strings, Required)

The locations to search in (e.g., ['us', 'eu', 'global']).

• Must contain at least one location.
• The first location in the list is used as the parent location to initiate the search and for billing/quota.
• The search will retrieve links from all valid locations provided in the list.

root_entities (Array of Objects, Required)

The starting entities (roots) for the lineage graph traversal. The maximum number of entities is 20. Each object represents an entity reference and must contain:

• fully_qualified_name (String, Required): The FQN of the entity (e.g., a BigQuery table FQN).
• fields (Array of Strings, Optional): The fields/columns of the entity to search for Column-Level Lineage (CLL). Supports wildcards.

direction (String, Required)

The direction of the search. Supported values:

• UPSTREAM: Search for assets that contribute to the root entities (sources).
• DOWNSTREAM: Search for assets that are derived from the root entities (targets).

max_depth (Integer, Optional)

The maximum depth of the search in the lineage graph.

• API Default: 5
• Maximum: 100
• Note: If omitted, the GCP API default of 5 will be used.

max_results (Integer, Optional)

The maximum number of links to return in the response.

• API Default: 1000
• Maximum: 10000
• Note: If omitted, the GCP API default of 1000 will be used.

max_process_per_link (Integer, Optional)

The maximum number of processes to return per link.

• API Default: 0 (no processes returned).
• Maximum: 100
• Note: If omitted, the GCP API default of 0 will be used. Must be greater than 0 if request_process_details is true.

request_process_details (Boolean, Optional)

If set to true, instructs the tool to retrieve full process details (such as displayName, attributes, and origin) for the processes associated with the links.

• Default: false
• Requirement: Requires max_process_per_link to be explicitly set to a value greater than 0. If max_process_per_link is 0 or omitted, a validation error will be returned.
• Behavior: When true, it sets the system x-goog-fieldmask header to "links,links.processes.process,unreachable" to request full process details from the API.

Example

kind: tool
name: search_lineage
type: datalineage-search-lineage
source: my-lineage-source
description: Use this tool to search data lineage links for BigQuery tables.

Output Format

The tool returns a structured JSON object containing the following fields:

• links (Array of Objects): A list of accumulated lineage links. Each object represents a lineage link containing details like name, source entity, target entity, endTime, startTime, and optionally associated processes (if process details were requested).
• unreachable (Array of Strings, Optional): A list of GCP locations that failed to respond during the multi-location search (e.g., projects/123456789/locations/us-east1). This field is omitted if there are no unreachable locations.

Example Response

{
  "links": [
    {
      "name": "projects/my-project/locations/us/links/link-id",
      "source": {
        "fullyQualifiedName": "bigquery:project.dataset.source_table"
      },
      "target": {
        "fullyQualifiedName": "bigquery:project.dataset.target_table"
      },
      "startTime": "2026-01-01T01:01:01.010Z",
      "endTime": "2026-01-01T01:01:01.010Z"
    }
  ],
  "unreachable": ["projects/my-project/locations/us-east1"]
}

Reference