action slack_post_message {
  label: "Post message"
  description: "Post a message to a Slack channel, DM, or other conversation."
  provider: slack
  method: POST
  path: "/chat.postMessage"
  encoding: form
  scopes: ["chat:write"]
  input: @json {
    {
      "type": "object",
      "required": ["channel", "text"],
      "additionalProperties": false,
      "properties": {
        "channel": {
          "type": "string",
          "description": "Channel, private group, or DM id (e.g. C1234567890) or name (e.g. #general)."
        },
        "text": {
          "type": "string",
          "description": "Message text. Required when blocks is not provided."
        },
        "thread_ts": {
          "type": "string",
          "description": "Parent message timestamp for a thread reply."
        },
        "blocks": {
          "type": "array",
          "description": "Structured Block Kit blocks (JSON-encoded when sent).",
          "items": { "type": "object" }
        },
        "attachments": {
          "type": "array",
          "items": { "type": "object" }
        },
        "unfurl_links": { "type": "boolean" },
        "unfurl_media": { "type": "boolean" },
        "mrkdwn": { "type": "boolean" }
      }
    }
  }
  output: @json {
    {
      "type": "object",
      "required": ["ok"],
      "additionalProperties": true,
      "properties": {
        "ok": { "type": "boolean" },
        "channel": { "type": "string" },
        "ts": { "type": "string" },
        "message": { "type": "object" },
        "error": { "type": "string" }
      }
    }
  }
}