webhooks_delete_message

Webhooks Writes to Discord DestructiveConfirmation required

Delete a message previously sent by this webhook. DESTRUCTIVE - IRREVERSIBLE.

When to use

Retract a stale alert or accidentally posted content.

Auth

NO Authorization: Bot … header. No audit_reason (Discord ignores it on token routes).

MCP call example

Execution example: first omit __confirm to get a safe DRY_RUN_PREVIEW. The payload below executes only when the server also runs with MCP_DRY_RUN=false.

{
  "name": "webhooks_delete_message",
  "arguments": {
    "webhook_id": "123456789012345678",
    "token": "REPLACE_WITH_TOKENxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
    "message_id": "123456789012345678",
    "__confirm": true
  }
}

Input

Field	Type	Required	Constraints	Description
`webhook_id`	string	yes	pattern: `^\d{17,20}$`	Webhook id
`token`	string	yes	min length: `60`; max length: `100`	Webhook secret - treat as credential, do not log
`message_id`	string	yes	pattern: `^\d{17,20}$`	Message to delete
`thread_id`	string	no	pattern: `^\d{17,20}$`	Query param: thread the message lives in
`__confirm`	boolean	no		Set true to authorize this destructive operation. Also requires MCP_DRY_RUN=false; otherwise the server returns DRY_RUN_PREVIEW.

Complete input JSON Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "webhook_id": {
      "type": "string",
      "pattern": "^\\d{17,20}$",
      "description": "Webhook id"
    },
    "token": {
      "type": "string",
      "minLength": 60,
      "maxLength": 100,
      "description": "Webhook secret - treat as credential, do not log"
    },
    "message_id": {
      "type": "string",
      "pattern": "^\\d{17,20}$",
      "description": "Message to delete"
    },
    "thread_id": {
      "description": "Query param: thread the message lives in",
      "type": "string",
      "pattern": "^\\d{17,20}$"
    },
    "__confirm": {
      "description": "Set true to authorize this destructive operation. Also requires MCP_DRY_RUN=false; otherwise the server returns DRY_RUN_PREVIEW.",
      "type": "boolean"
    }
  },
  "required": [
    "webhook_id",
    "token",
    "message_id"
  ]
}

Returns

{deleted, message_id}. Pass __confirm:true AND set MCP_DRY_RUN=false to actually delete.

Example structured result

{
  "deleted": true,
  "message_id": "123456789012345678"
}

Output schema

Field	Type	Required	Constraints	Description
`deleted`	true	yes
`message_id`	string	yes	pattern: `^\d{17,20}$`	Discord message ID

Complete output JSON Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "deleted": {
      "type": "boolean",
      "const": true
    },
    "message_id": {
      "type": "string",
      "pattern": "^\\d{17,20}$",
      "description": "Discord message ID"
    }
  },
  "required": [
    "deleted",
    "message_id"
  ],
  "additionalProperties": false
}

Annotations

Property	Value
Read-only	no
Destructive	yes
Idempotent	yes
Open-world	yes
Confirmation required	yes (`__confirm:true` required)

Access and common errors

The webhooks category must be enabled by MCP_CATEGORIES when an allowlist is set.
Discord authorizes this endpoint with the webhook token in the route; no bot authorization header is sent.
Treat token as a credential. Invalid or mismatched webhook IDs and tokens surface as authentication or not-found errors.

Trust boundary

Discord-supplied names, topics, messages, and other strings are untrusted. Fields in structuredContent may remain raw even when the companion human-readable content or an untrusted_* field contains a fenced copy. Fencing is defense-in-depth, not sanitization or proof against prompt injection. Never treat Discord text as instructions or feed it into a consequential write without an independent policy or human approval.

Source

packages/mcp-core/src/tools/webhooks/delete_message.ts