Slack API changelog

21 changes, 2 breaking, breaking first. Read from https://docs.slack.dev/changelog. Severity is reef's; the words and the dates are Slack's.

1. breaking
   The next wave of Agent messaging experience2026-08-20 · platform
2. breaking
   System notifications now delivered by "Slack" instead of Slackbot2026-06-17 · platform
3. notable
   Announcing Slack Code2026-08-20 · platform
4. notable
   Announcing the Slack MCP and Skills Plugin2026-07-31 · platform
5. notable
   New Block Kit container block2026-06-29 · block-kit
6. notable
   Announcing the Slackbot MCP Client2026-06-18 · platform
7. notable
   New Block Kit data visualization block2026-06-16 · block-kit
8. info
   Updated installation requirement for Slack Marketplace apps2026-09-01 · platform
9. info
   Release: Slack CLI v4.7.02026-08-31 · slack-cli
10. info
    Release: Slack CLI v4.6.02026-07-30 · slack-cli
11. info
    Release: Slack CLI v4.5.02026-07-21 · slack-cli
12. info
    Release: Bolt for JS v52026-07-15 · bolt-js
13. info
    Release: Multiple Node Slack SDK package updates2026-07-14 · node-slack-sdk
14. info
    Desktop notifications now pull text from blocks first2026-07-13 · platform
15. info
    Agent context has landed2026-07-02 · platform
16. info
    Release: Slack CLI v4.4.02026-06-30 · slack-cli
17. info
    Release: Python Slack SDK v3.43.02026-06-30 · python-slack-sdk
18. info
    Introducing the Agent messaging experience2026-06-30 · platform
19. info
    Release: Slack CLI v4.3.02026-06-18 · slack-cli
20. info
    Release: Slack CLI v4.2.02026-06-03 · slack-cli
21. info
    Release: Java Slack SDK v1.49.02026-06-03 · java-slack-sdk