Slack deprecates the Assistant messaging experience (assistant_view) in
February 2027: assistant.threads.setStatus/setTitle are replaced by
agents.sessions.setStatus/rename. slack-sdk 3.44.0 (Aug 27 2026) ships
the typed methods with drop-in-compatible signatures.
- adapter: capability probe on the AsyncWebClient CLASS (never instance —
mock auto-attributes lie), cached; status set/clear + thread title route
through agents.sessions.* when available, legacy otherwise
- pins: slack-sdk 3.43.0 -> 3.44.0 (pyproject messaging+slack extras,
lazy_deps, uv.lock)
- tests: autouse fixture pins the probe to legacy under the mocked SDK;
5 new tests cover both routing paths for typing, clear, and title
- docs: slack.md scope table + status-line notes mention both methods
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