Post to Slack

Let your AI post to Slack without ever seeing the bot token.

Deliver a message to a Slack channel through a signed FlurryPORT pipe. The bot token lives server-side; the agent posts a simple intent and gets a receipt.

The credential never enters the model context: it lives in the FlurryPORT secret store, deliveries are signed server-side, and every send returns a receipt your agent can quote.

npx flurryport mcp

Tools your agent gains

flry_slack_post

Post a message to the configured Slack channel through the signed pipe. Input: text (required), channel (optional override).

Setup walkthrough

1. SLACK_BOT_TOKEN: Create a Slack app, add the chat:write scope under OAuth & Permissions, install to your workspace, copy the bot token (xoxb-). Paste it in the FlurryPORT secret page this setup links to; the agent never sees it.

Intent schema

{
  "type": "object",
  "required": [
    "text"
  ],
  "properties": {
    "text": {
      "type": "string",
      "maxLength": 4000
    },
    "channel": {
      "type": "string",
      "description": "Channel ID or name; omit when the install fixed one."
    }
  }
}

Install-time parameters

channel

install-time: Default channel for this install; runtime intent.channel overrides when present.

Transformation

{ "channel": $body.channel ? $body.channel : $install.channel, "text": $body.text }

Delivery target

POST https://slack.com/api/chat.postMessage

Placeholders like $secrets.NAME resolve server-side at delivery, never in the agent.

Gotchas

• chat.postMessage returns 200 with ok:false on channel errors; the receipt body carries the Slack error string, so read the body, not the status.
• The bot must be invited to the channel it posts to; not_in_channel is the error that says so.

Where this fits

• Destination: Slack
• Messaging recipes
• What agent tokens can and cannot do
• All recipes

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