Send Message

Immutable Catalog + Curated Guide

This lossless descriptor comes from the active Portal catalog and is enhanced with reviewed examples.

WRITEdiscord.send_message

Contract tier: agent_ready
Risk: write
Catalog version: discord-2026.07.12.3
Descriptor hash: 2bfe6c2b65154d880643da880110b9ca04e9b9660c44458febc45a5768756b19

Post messages or embeds to channels and threads.

Request Body

{
  "jsonrpc": "2.0",
  "id": "discord-send-message-example",
  "method": "tools/call",
  "params": {
    "name": "discord.send_message",
    "arguments": {
      "channel_id": "123456789",
      "message": "Release 2.7 is now live.",
      "embed_title": "Release Update",
      "embed_description": "Patch notes are in #announcements"
    }
  }
}

Arguments Schema

{
  "type": "object",
  "title": "send_message input",
  "properties": {
    "file": {
      "anyOf": [
        {
          "type": "object",
          "properties": {
            "url": {
              "type": "string",
              "format": "uri",
              "description": "Public HTTP(S) attachment URL."
            },
            "path": {
              "type": "string",
              "description": "Allowlisted server-local attachment path."
            },
            "base64": {
              "type": "string",
              "description": "Base64 or data-URL attachment bytes."
            },
            "filename": {
              "type": "string",
              "description": "Attachment filename including extension."
            },
            "content_type": {
              "type": "string",
              "description": "Optional attachment MIME type."
            }
          },
          "description": "One attachment source object.",
          "additionalProperties": false
        },
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "title": "File",
      "default": null,
      "description": "Optional attachment object or source string; use exactly one attachment source field."
    },
    "confirm": {
      "type": "string",
      "title": "Confirm",
      "default": "",
      "description": "Exact phrase CONFIRM APPLY when confirmation policy is enabled; never place credentials here."
    },
    "dry_run": {
      "anyOf": [
        {
          "type": "boolean"
        },
        {
          "type": "string"
        }
      ],
      "title": "Dry Run",
      "default": false,
      "description": "When true, validate and return the plan without changing Discord state."
    },
    "message": {
      "type": "string",
      "title": "Message",
      "default": "",
      "description": "Message text to send; do not include credentials or confirmation tokens."
    },
    "file_url": {
      "type": "string",
      "title": "File Url",
      "default": "",
      "description": "Public HTTP(S) attachment URL; private and loopback destinations are rejected."
    },
    "file_name": {
      "type": "string",
      "title": "File Name",
      "default": "",
      "description": "Safe attachment filename including extension."
    },
    "file_path": {
      "type": "string",
      "title": "File Path",
      "default": "",
      "description": "Allowlisted server-local path; hosted agents should use file_base64 or file_url."
    },
    "attachment": {
      "anyOf": [
        {
          "type": "object",
          "properties": {
            "url": {
              "type": "string",
              "format": "uri",
              "description": "Public HTTP(S) attachment URL."
            },
            "path": {
              "type": "string",
              "description": "Allowlisted server-local attachment path."
            },
            "base64": {
              "type": "string",
              "description": "Base64 or data-URL attachment bytes."
            },
            "filename": {
              "type": "string",
              "description": "Attachment filename including extension."
            },
            "content_type": {
              "type": "string",
              "description": "Optional attachment MIME type."
            }
          },
          "description": "One attachment source object.",
          "additionalProperties": false
        },
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "title": "Attachment",
      "default": null,
      "description": "Legacy alias for file. Provide one object with base64, url, or path plus optional filename and content_type, or one source string."
    },
    "channel_id": {
      "type": "string",
      "title": "Channel Id",
      "default": "",
      "description": "Discord channel snowflake; empty uses the primary channel only where documented."
    },
    "embed_color": {
      "type": "string",
      "title": "Embed Color",
      "default": "",
      "description": "Optional embed color as a base-10 integer string from 0 through 16777215."
    },
    "embed_title": {
      "type": "string",
      "title": "Embed Title",
      "default": "",
      "description": "Optional embed title, limited to Discord's 256-character title limit."
    },
    "file_base64": {
      "type": "string",
      "title": "File Base64",
      "default": "",
      "description": "Base64 or data-URL bytes for one attachment within the configured decoded-size limit."
    },
    "thread_name": {
      "type": "string",
      "title": "Thread Name",
      "default": "",
      "description": "Optional continuation-thread name for split delivery."
    },
    "thread_if_split": {
      "anyOf": [
        {
          "type": "boolean"
        },
        {
          "type": "string"
        }
      ],
      "title": "Thread If Split",
      "default": false,
      "description": "When true, create a continuation thread if splitting is required and allowed."
    },
    "embed_description": {
      "type": "string",
      "title": "Embed Description",
      "default": "",
      "description": "Optional embed body text; Discord size limits are validated."
    },
    "file_content_type": {
      "type": "string",
      "title": "File Content Type",
      "default": "",
      "description": "Optional attachment MIME type when it cannot be safely inferred."
    }
  },
  "description": "Validated input for the Discord MCP send_message tool."
}

Output Schema

{
  "oneOf": [
    {
      "type": "object",
      "required": [
        "ok",
        "data",
        "meta"
      ],
      "properties": {
        "ok": {
          "const": true
        },
        "data": {
          "type": "object",
          "properties": {
            "dry_run": {
              "type": [
                "boolean",
                "null"
              ],
              "description": "Provider data field dry_run returned by send_message."
            },
            "jump_url": {
              "type": [
                "string",
                "null"
              ],
              "description": "Provider data field jump_url returned by send_message."
            },
            "thread_id": {
              "type": [
                "string",
                "null"
              ],
              "description": "Provider data field thread_id returned by send_message."
            },
            "channel_id": {
              "type": [
                "string",
                "null"
              ],
              "description": "Provider data field channel_id returned by send_message."
            },
            "message_id": {
              "type": [
                "string",
                "null"
              ],
              "description": "Provider data field message_id returned by send_message."
            },
            "attachments": {
              "type": "array",
              "items": {},
              "description": "Provider data field attachments returned by send_message."
            },
            "diagnostics": {
              "type": [
                "object",
                "null"
              ],
              "description": "Provider data field diagnostics returned by send_message.",
              "additionalProperties": true
            },
            "planned_parts": {
              "type": [
                "integer",
                "null"
              ],
              "description": "Provider data field planned_parts returned by send_message."
            },
            "sent_message_ids": {
              "type": "array",
              "items": {},
              "description": "Provider data field sent_message_ids returned by send_message."
            }
          },
          "description": "message/channel/thread IDs, jump URL, attachment metadata, and a safe delivery plan",
          "additionalProperties": true
        },
        "meta": {
          "type": "object",
          "required": [
            "duration_ms",
            "rate_limit",
            "warnings"
          ],
          "properties": {
            "guild_id": {
              "type": "string"
            },
            "warnings": {
              "type": "array",
              "items": {
                "type": "string"
              }
            },
            "thread_id": {
              "type": "string"
            },
            "channel_id": {
              "type": "string"
            },
            "rate_limit": {
              "type": "object",
              "additionalProperties": true
            },
            "request_id": {
              "type": "string"
            },
            "duration_ms": {
              "type": "integer",
              "minimum": 0
            }
          },
          "description": "Safe execution metadata containing no credentials or raw headers.",
          "additionalProperties": true
        }
      },
      "additionalProperties": false
    },
    {
      "type": "object",
      "required": [
        "ok",
        "error",
        "meta"
      ],
      "properties": {
        "ok": {
          "const": false
        },
        "meta": {
          "type": "object",
          "required": [
            "duration_ms",
            "rate_limit",
            "warnings"
          ],
          "properties": {
            "guild_id": {
              "type": "string"
            },
            "warnings": {
              "type": "array",
              "items": {
                "type": "string"
              }
            },
            "thread_id": {
              "type": "string"
            },
            "channel_id": {
              "type": "string"
            },
            "rate_limit": {
              "type": "object",
              "additionalProperties": true
            },
            "request_id": {
              "type": "string"
            },
            "duration_ms": {
              "type": "integer",
              "minimum": 0
            }
          },
          "description": "Safe execution metadata containing no credentials or raw headers.",
          "additionalProperties": true
        },
        "error": {
          "type": "object",
          "required": [
            "type",
            "message"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "message": {
              "type": "string"
            },
            "diagnostics": {
              "type": "object",
              "additionalProperties": true
            },
            "required_perms": {
              "type": "array",
              "items": {
                "type": "string"
              }
            },
            "discord_error_code": {
              "type": "integer"
            }
          },
          "additionalProperties": false
        }
      },
      "additionalProperties": false
    }
  ],
  "title": "Discord MCP provider result",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "description": "Normalized success or semantic-error response; ok=false is a failed call."
}

Code Examples

cURL
Node.js
Python

curl -X POST 'https://portal.madpanda3d.com/api/mcp' \
  -H 'Authorization: Bearer mad_live_***' \
  -H 'Content-Type: application/json' \
  -d '{
  "jsonrpc": "2.0",
  "id": "discord-send-message-example",
  "method": "tools/call",
  "params": {
    "name": "discord.send_message",
    "arguments": {
      "channel_id": "123456789",
      "message": "Release 2.7 is now live.",
      "embed_title": "Release Update",
      "embed_description": "Patch notes are in #announcements"
    }
  }
}'

const response = await fetch('https://portal.madpanda3d.com/api/mcp', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer mad_live_***',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
  "jsonrpc": "2.0",
  "id": "discord-send-message-example",
  "method": "tools/call",
  "params": {
    "name": "discord.send_message",
    "arguments": {
      "channel_id": "123456789",
      "message": "Release 2.7 is now live.",
      "embed_title": "Release Update",
      "embed_description": "Patch notes are in #announcements"
    }
  }
}),
});
const data = await response.json();
console.log(data);

import requests

url = 'https://portal.madpanda3d.com/api/mcp'
headers = {
    'Authorization': 'Bearer mad_live_***',
    'Content-Type': 'application/json',
}
payload = {
  "jsonrpc": "2.0",
  "id": "discord-send-message-example",
  "method": "tools/call",
  "params": {
    "name": "discord.send_message",
    "arguments": {
      "channel_id": "123456789",
      "message": "Release 2.7 is now live.",
      "embed_title": "Release Update",
      "embed_description": "Patch notes are in #announcements"
    }
  }
}
response = requests.post(url, headers=headers, json=payload, timeout=60)
print(response.json())

Example Responses

200 Success
429 Rate Limited

{
  "ok": true,
  "message_id": "1122334455"
}

{
  "ok": false,
  "error": "rate_limited",
  "retry_after_ms": 1200
}

Request Body​

Arguments Schema​

Output Schema​

Code Examples​

Example Responses​

Request Body

Arguments Schema

Output Schema

Code Examples

Example Responses