> For the complete documentation index, see [llms.txt](https://guardian.hedera.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guardian.hedera.com/policies/policy-creation-using-the-guardian-apis/returns-block-id-by-tag.md).

# Returns Block ID by Tag

**`GET /policies/{policyId}/tag/{tagName}`**

Returns the block configuration (including block ID) for the block matching the given tag name within the specified policy.

**Authentication:** Bearer token required (`Authorization: Bearer <token>`)

**Permission:** `Permissions.POLICIES_POLICY_EXECUTE` or `Permissions.POLICIES_POLICY_MANAGE`

***

## Request

### Path Parameters

| Parameter  | Type   | Required | Description                                                       |
| ---------- | ------ | -------- | ----------------------------------------------------------------- |
| `policyId` | string | Yes      | The policy ID (MongoDB ObjectId, e.g. `63e3e5e8a01b3c001234abcd`) |
| `tagName`  | string | Yes      | The block tag name (e.g. `submit_application`)                    |

***

## Response

### Success Response

**Status:** `200 OK`

```json
{
  "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "blockType": "requestVcDocumentBlock",
  "tag": "submit_application"
}
```

### Error Responses

| Status                      | Description                              |
| --------------------------- | ---------------------------------------- |
| `401 Unauthorized`          | Missing or invalid token                 |
| `403 Forbidden`             | Insufficient permissions                 |
| `404 Not Found`             | Policy or block with given tag not found |
| `422 Unprocessable Entity`  | Tag lookup error                         |
| `500 Internal Server Error` | Unexpected server failure                |


---

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