# Answer your person's message on a board

> Page: https://docs.plotwork.dev/api/post-v1-boards-board-messages-message-replies. Index of every page: https://docs.plotwork.dev/llms.txt

The agent's answer to one message of its own thread, shown at once on its person's screen; the message is marked answered.

`POST /v1/boards/{board}/messages/{message}/replies`

## TL;DR

| Question | Answer |
|---|---|
| What does it do? | Answer your person's message on a board. |
| What does it take? | A JSON body of type [`BoardReplyBody`](https://docs.plotwork.dev/api/schemas.md#boardreplybody). |
| What does it return? | Status 200 with a body of type [`BoardMessageSent`](https://docs.plotwork.dev/api/schemas.md#boardmessagesent). |
| What can go wrong? | `400` the body is not valid; `401` the API key is missing or not valid; `403` the account's plan does not include the REST API (plan.rest_not_included), the key is a person's own (boards.org_key_required), an organisation key with no member, which has no messages (boards.connection_required), a trusted publisher (boards.publisher_not_allowed), or boards are not on for the organisation (boards.not_enabled); `404` no such board, or one not open to the caller; for a reply, no such message in this connection's thread (boards.message_not_found); `413` the body is larger than the API takes; `422` the reply holds something that looks like a secret, and the organisation blocks them (boards.secret_blocked); `429` too many requests, or a daily limit is spent; `503` live whiteboards are not set up on this server. Every failure uses the one error envelope. |

## What it does

The agent's answer to one message of its own thread, shown at once on its person's screen; the message is marked answered. Scanned for secrets. The REST twin of reply_board_message.

## Path parameters

| Field | Type | Required | Description |
|---|---|---|---|
| `board` | `string` | yes | The board's id: 22 letters and digits. |
| `message` | `string` | yes | The message answered. |

## Request body

The body has the type [`BoardReplyBody`](https://docs.plotwork.dev/api/schemas.md#boardreplybody).

| Field | Type | Required | Description |
|---|---|---|---|
| `text` | `string` | yes | at least 1 character; at most 2000 characters. |
| `tab` | `string \| null` | no | at least 12 characters; at most 12 characters; pattern `^[0-9A-Za-z]+$`. |
| `revision` | `string \| null` | no | at least 12 characters; at most 12 characters; pattern `^[0-9A-Za-z]+$`. |

## Responses

| Status | Meaning | Body |
|---|---|---|
| 200 | The reply, as the thread shows it. | [`BoardMessageSent`](https://docs.plotwork.dev/api/schemas.md#boardmessagesent) |
| 400 | The body is not valid. | [`ErrorResponse`](https://docs.plotwork.dev/api/schemas.md#errorresponse) |
| 401 | The API key is missing or not valid. | [`ErrorResponse`](https://docs.plotwork.dev/api/schemas.md#errorresponse) |
| 403 | The account's plan does not include the REST API (plan.rest_not_included), the key is a person's own (boards.org_key_required), an organisation key with no member, which has no messages (boards.connection_required), a trusted publisher (boards.publisher_not_allowed), or boards are not on for the organisation (boards.not_enabled). | [`ErrorResponse`](https://docs.plotwork.dev/api/schemas.md#errorresponse) |
| 404 | No such board, or one not open to the caller; for a reply, no such message in this connection's thread (boards.message_not_found). | [`ErrorResponse`](https://docs.plotwork.dev/api/schemas.md#errorresponse) |
| 413 | The body is larger than the API takes. | [`ErrorResponse`](https://docs.plotwork.dev/api/schemas.md#errorresponse) |
| 422 | The reply holds something that looks like a secret, and the organisation blocks them (boards.secret_blocked). | [`ErrorResponse`](https://docs.plotwork.dev/api/schemas.md#errorresponse) |
| 429 | Too many requests, or a daily limit is spent. | [`ErrorResponse`](https://docs.plotwork.dev/api/schemas.md#errorresponse) |
| 503 | Live whiteboards are not set up on this server. | [`ErrorResponse`](https://docs.plotwork.dev/api/schemas.md#errorresponse) |

## Response body

A 200 answer has the type [`BoardMessageSent`](https://docs.plotwork.dev/api/schemas.md#boardmessagesent).

| Field | Type | Required | Description |
|---|---|---|---|
| `message` | `BoardMessage` | yes |  |
| `message.id` | `string` | yes |  |
| `message.connection` | `string` | yes |  |
| `message.owner` | `string` | yes |  |
| `message.at` | `integer` | yes |  |
| `message.from` | `"person" \| "agent"` | yes |  |
| `message.label` | `string` | yes |  |
| `message.text` | `string` | yes |  |
| `message.tab` | `string \| null` | yes |  |
| `message.revision` | `string \| null` | yes |  |
| `message.problems` | `BoardAgentProblem[]` | yes |  |
| `message.problems[].code` | `string` | yes | pattern `^[A-Z]\d{3,4}$`. |
| `message.problems[].severity` | `"error" \| "warning"` | yes |  |
| `message.problems[].line` | `integer` | yes | minimum 1; maximum 1000000. |
| `message.problems[].column` | `integer` | yes | minimum 1; maximum 1000000. |
| `message.problems[].message` | `string` | yes | at least 1 character; at most 500 characters. |
| `message.problems[].hint` | `string \| null` | yes | at least 1 character; at most 500 characters. |
| `message.inReplyTo` | `string \| null` | yes |  |
| `message.status` | `"sent" \| "delivered" \| "answered"` | yes | sent: kept for the agent; delivered: the agent read it; answered: the agent replied. |
| `message.deliveredAt` | `integer \| null` | yes |  |
| `message.answeredAt` | `integer \| null` | yes |  |
| `secrets` | `object` | yes |  |
| `secrets.count` | `integer` | yes |  |
| `secrets.kinds` | `string[]` | yes |  |

## See also

| Doc | Why |
|---|---|
| [API reference](https://docs.plotwork.dev/api/reference.md) | Every endpoint, and the error envelope |
| [Schemas](https://docs.plotwork.dev/api/schemas.md) | Every request and response type |
| [Tool reference](https://docs.plotwork.dev/mcp/tools.md) | The operations as callable tools |