[RSO]

Summary

• Routes the existing Slack app webhook and interactivity endpoints through the canonical Chat SDK Slack bot.
• Removes the obsolete slack-next platform/install flow and makes PLATFORM.SLACK the only Slack integration platform in app code.
• Uses the Chat SDK Slack adapter's official OAuth callback handler to exchange codes and seed installation state for the existing Slack app.

Verification

• N/A (manual Slack workspace verification should be completed in staging after deploy).

Visual Changes

N/A

Reviewer Notes

• No database migration is included because platform_integrations.platform is plain text and slack-next has no active production installs.
• Slack SDK installation sync/backfill helpers were removed; new installs are seeded by slackAdapter.handleOAuthCallback() in the existing Slack OAuth callback route.
• SLACK_BOT_NEW_INFRA_PLATFORM_INTEGRATION_IDS and SLACK_NEXT_* deployment env vars are obsolete after this rollout.
• Automated checks run locally: pnpm test -- apps/web/src/lib/bot/platform-helpers.test.ts, pnpm typecheck, pnpm lint, pnpm format.

[kilo-code-bot]

Code Review Summary

Status: 3 Issues Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	3
SUGGESTION	0

Issue Details (click to expand)

WARNING

File	Line	Issue
apps/web/src/app/api/integrations/slack/callback/route.ts	103	Only fresh OAuth installs are now seeded into adapter state, so pre-existing Slack integrations can stop working until they reinstall.
apps/web/src/app/slack/webhook/route.ts	27	External Slack Connect events are still forwarded because the previous cross-workspace guard was removed.

Other Observations (not in diff)

Issues found in unchanged code that cannot receive inline comments:

File	Line	Issue
apps/web/src/lib/integrations/slack-service.ts	163	The scopes regression is fixed, but reinstall/update still drops metadata.incoming_webhook, so sendTestMessage() can lose its webhook-based path after reinstall.

Files Reviewed (1 file)

• apps/web/src/lib/integrations/slack-service.ts - verified the scopes fix; incoming_webhook regression remains

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_{Reviewed by gpt-5.4-20260305 · 410,292 tokens}

[markijbema]

ok

[markijbema]