communications
Slack Errors
Slack Web API errors: invalid_auth, not_authed, account_inactive, missing_scope, channel_not_found, rate_limited. Tier-based rate limits (Tier 1: 1 req/min, Tier 4: 100+/min).
Slack errors return as `{ok: false, error: 'error_code'}` in JSON, even on HTTP 200. Always check `ok` field, not status. Rate limit tiers: Tier 1 (~1/min), Tier 2 (~20/min), Tier 3 (~50/min), Tier 4 (~100/min). Posting messages = Tier 4. Workspace audit = Tier 1. Honour `Retry-After` header.
Official docs
https://api.slack.com/web#responses
Status page
https://status.slack.com/
Support
https://slack.com/help/