---
title: "Report a chat message"
method: POST
path: "/chat/messages/{messageId}/report"
tags: ["Match Chat"]
---

# Report a chat message

`POST /chat/messages/{messageId}/report`

Reports a chat message for staff moderation as the API key owner. The owner must be a participant of the message's chat room; a non-participant receives 403. System messages and the owner's own messages cannot be reported. Reporting the same message twice is idempotent (returns the existing report with alreadyReported: true). Requires the chat.write scope and the writes feature. Supports the Idempotency-Key header.

## Path parameters

- `messageId` string, required — ID of the chat message to report.

## Request body

- ReportChatMessageRequestBody — Reports a chat message for staff moderation review.
  - `reason` string — Optional reason for the report (max 500 chars).

## Response `200`

The message was reported (or was already reported).

- ReportChatMessageResponse
  - `success` true, required
  - `reportId` string, required — Report ID (existing one if already reported).
  - `alreadyReported` boolean, required — True if the owner had already reported this message.
  - `timestamp` string, required — Response generation time (ISO 8601).

## Other responses

- `400` — Bad request (invalid body, cursor, limit, or date).
- `401` — Missing or invalid API key.
- `403` — API key lacks the required permission.
- `404` — Resource not found.
- `409` — Conflict.
- `429` — Rate limited.
- `500` — Internal server error.

## Changes

- **2026-06-10** `82f2480cdb83` — 2 info
  - api tag `Match Chat` added
  - api tag `Chat` removed
- **2026-06-08** `33b01a4694a7` — 1 info
  - endpoint added
- **2026-06-04** `f22bd61fd595` — 1 breaking
  - api path removed without deprecation

[Change history](https://skmtc.dev/teambattles/apis/teambattles-api/changes/chat/messages/:messageId/report/post.md)

---

[API](https://skmtc.dev/teambattles/apis/teambattles-api.md) · [All operations](https://skmtc.dev/teambattles/apis/teambattles-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/teambattles/teambattles-api/revisions/2ffe8fb53b7d/schema)