feat(slack): switch custom bots to the Sim Search app

[TheodoreSpeaks]

Summary

• Let admins install the Sim Search app from an existing custom bot's connection menu.
• Activate the replacement and disable the custom bot in one transaction after OAuth, preserving existing personal source connections.
• Reply to DMs sent to the retired bot with an Open Sim Search button, using the active replacement in the same organization and Slack workspace.
• Limit shared-app setup to hosted deployments with the rollout flag enabled, simplify the installation dialog, and show completion as a toast.

Type of Change

• New feature

Testing

• Focused tests passed, covering OAuth transitions, reconnects, stale configuration, authorization, source preservation, managed-user setup, settings behavior, and deduplicated handoff replies. The handoff validation passed 370 tests across 30 suites.
• Full lint, repository audits, block registry, and docs manifest checks passed. Typechecks run in CI.
• Verified the settings UI and shared-app OAuth reconnect manually. Live handoff and full model-response validation remain pending.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Skipped		Sep 14, 2026 8:40pm UTC

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with no outstanding findings or newly introduced actionable issues.

Summary

This PR migrates eligible custom Slack Search bots to the hosted Sim Search app while preserving existing personal source connections.

• Adds an atomic OAuth transition that activates the shared app and disables the replaced custom bot.
• Adds authorization and durable, deduplicated DM handoff replies for retired bots.
• Restricts shared-app availability to hosted deployments with the rollout flag enabled.
• Updates settings UI, OAuth state, manifests, message rendering, and focused test coverage.

Diagram

sequenceDiagram
    participant Admin
    participant Sim
    participant Slack
    participant DB
    participant RetiredBot as Retired custom bot
    participant SharedApp as Sim Search app

    Admin->>Sim: Install Sim Search from custom bot
    Sim->>Slack: Start shared-app OAuth
    Slack-->>Sim: OAuth callback
    Sim->>DB: Transaction: disable custom bot and activate shared app
    Sim-->>Admin: Slack connected toast

    Admin->>RetiredBot: Send DM after migration
    RetiredBot->>Sim: Deliver message event
    Sim->>DB: Persist deduplicated handoff turn
    Sim->>RetiredBot: Post Open Sim Search button
    Admin->>SharedApp: Continue conversation

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_{Reviews (5) · Last reviewed commit: "feat(slack): link retired bots to the Si..."}

[TheodoreSpeaks]

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