Schedule a message

Schedule a message

Schedules a message to post to a channel at a future Unix time and returns its scheduled message ID.

Needs the chat:write scope. post_at can be at most 120 days ahead.

Set up

Use the first option your agent supports.

MCP (official, remote)

Add this server to your agent's MCP settings, then sign in when asked.

{ "mcpServers": { "slack": { "url": "https://mcp.slack.com/mcp" } } }

Call the MCP tool slack_schedule_message.

Server URL: https://mcp.slack.com/mcp

CLI (official)

Install the command, then confirm it runs.

curl -fsSL https://downloads.slack-edge.com/slack-cli/install.sh | bash
slack --version

Run slack api chat.scheduleMessage.

Set $SLACK_BOT_TOKEN in your environment first (get a key: https://api.slack.com/apps).

API (official)

• Base URL: https://slack.com/api
• Endpoint: POST /chat.scheduleMessage
• Auth: send the header Authorization: Bearer $SLACK_BOT_TOKEN
• Get a key: https://api.slack.com/apps
• Docs: https://docs.slack.dev/apis/web-api/

Before doing anything else, make one read-only call to confirm access.

Rules

• Ask the user before anything that sends messages, costs money, or changes data.
• Never print API keys.