> For the complete documentation index, see [llms.txt](https://dev.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://dev.guardian.hedera.com/guardian/complex-iterative-review-and-approval-workflows/apis-related/creates-a-new-message-in-the-target-discussion.md).

# Creates a new message in the target discussion

**`POST /api/v1/policy-comments/{policyId}/{documentId}/discussions/{discussionId}/comments`**

Creates a new message in the target discussion thread.

**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      | Policy identifier     |
| `documentId`   | string | Yes      | Document identifier   |
| `discussionId` | string | Yes      | Discussion identifier |

### Request Body

```json
{
  "message": "The capacity figure should be 50 MWh — the extra zero appears to be a typo.",
  "mentionedUsers": [
    "did:hedera:testnet:zHcDLGFNymFAJiMBKnpbHDgjvTn6yZnwkPPeFhtJBECH_0.0.4532001"
  ]
}
```

| Field            | Type      | Required | Description                          |
| ---------------- | --------- | -------- | ------------------------------------ |
| `message`        | string    | Yes      | Comment text content                 |
| `mentionedUsers` | string\[] | No       | Array of user DIDs to mention/notify |

***

## Response

### Success Response

**Status:** `201 Created`

```json
{
  "id": "63e3e5e8a01b3c001234abcd",
  "message": "The capacity figure should be 50 MWh — the extra zero appears to be a typo.",
  "owner": "did:hedera:testnet:zHcDLGFNymFAJiMBKnpbHDgjvTn6yZnwkPPeFhtJBECH_0.0.4532001",
  "createDate": "2026-03-30T10:05:00.000Z"
}
```

### Error Responses

| Status                      | Description                             |
| --------------------------- | --------------------------------------- |
| `401 Unauthorized`          | Missing or invalid token                |
| `403 Forbidden`             | Insufficient permissions                |
| `422 Unprocessable Entity`  | Validation error — invalid field values |
| `500 Internal Server Error` | Unexpected server failure               |
| `503 Service Unavailable`   | Policy block unavailable                |