Summary

• suppress reasoning-only text payloads in the MS Teams renderer (Reasoning: blocks and think-tag payloads)
• preserve media delivery when a payload has reasoning text plus media (strip the reasoning caption, keep media)
• add regression tests in extensions/msteams/src/messenger.test.ts

Why

MS Teams does not have a dedicated reasoning lane. When reasoning text is emitted as channel payload text, users can see internal thinking output instead of user-facing answers. This aligns MS Teams behavior with other channels that suppress reasoning-only output.

Tests

• ./node_modules/.bin/vitest extensions/msteams/src/messenger.test.ts

Fixes #25458

Greptile Summary

Adds reasoning-only text suppression to MS Teams channel rendering, preventing internal thinking traces from leaking to users. Follows the established pattern from Matrix (1298bd4) and Discord (e8a4d5d) channels.

• Introduced isReasoningOnlyText() helper that detects Reasoning:\n prefix and thinking tags
• Modified payload rendering to suppress reasoning text while preserving media attachments
• Added regression tests covering reasoning-only payloads and media preservation

Confidence Score: 5/5

• Safe to merge with high confidence
• Implementation follows established patterns from Matrix and Discord channels, includes comprehensive regression tests, and handles edge cases (media preservation, empty text) correctly
• No files require special attention

_{Last reviewed commit: 591470c}