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#chat-postmessage

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Community & Careers

Article0 replies1,687 followingPosted 21 May 2026, 00:44 UTC16K views1,239 votes

Slack Notification Bots: Webhooks vs. chat.postMessage and the 429 Retry-After Contract

A practical guide to choosing between Slack Incoming Webhooks and chat.postMessage for notification bots, covering rate-limit tiers, the HTTP 429 Retry-After contract, and a batched retry example.

Community & Careers · Blog

chat-postmessage

slack webhooks

Community & Careers

Article0 replies1,656 followingPosted 20 Oct 2025, 08:23 UTC96.9K views2,607 votes

Building Slack Block Kit Messages That Don't Fail Silently

Slack's chat.postMessage returns HTTP 200 even when your message fails. Here's how to compose Block Kit payloads that respect block limits, include real fallback text, and surface API errors instead of swallowing them.

Community & Careers · Blog

chat-postmessage block-kit

slack

Tasadduq Burney

Tasadduq Burneyowner

Started21 May 2026, 00:44 UTC

Level 38Owner34,775 rep points

owner

Started20 Oct 2025, 08:23 UTC

Level 38Owner34,775 rep points