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

# Lookup Container

> Finds a Google Tag Manager container by its public tag ID (GTM-XXXXXX) or by a linked Google tag destination ID (e.g

Finds a Google Tag Manager container by its public tag ID (GTM-XXXXXX) or by a linked Google tag destination ID (e.g. a GA4 measurement ID), without knowing which account owns it.

| | |
| - | - |
| **App** | Google Tag Manager |
| **Operation ID** | `gtm_lookup_container` |
| **Type** | Action |
| **Connection** | `gtm` (required) |
| **Credits per run** | 1 |
| **Agent / MCP tool** | Yes |

## Inputs

| Field | Type | Required | Default | Description |
| - | - | - | - | - |
| `tag_id` | string | No | - | Look up by the container's public tag ID, e.g. GTM-ABC123. Provide either tag\_id or destination\_id, not both. |
| `destination_id` | string | No | - | Look up by a linked Google tag destination ID, e.g. a GA4 measurement ID like G-XXXXXXX. Provide either tag\_id or destination\_id, not both. |

## Output

**Type**: `Dict`

Returns the matching container as provided by the Tag Manager API, including its accountId.


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