Integrate slackbot with baml client and sage backend

[seawatts]

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Issue Reference

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• This PR fixes/closes #[issue number]

Changes

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This PR enables a Slackbot by adding a new Slack Events API endpoint to sage-backend and making the backend more resilient to environment-dependent initialization at build time.

Key changes include:

• New Slack Events API Route: Added /api/slack/events to handle Slack app_mention and direct messages, including signature verification and URL challenges.
• Integration with Existing Query Flow: The Slack bot leverages the existing submitQuery action to process user requests and respond in-thread.
• Lazy Initialization: Refactored OpenAI, Pinecone, NotionLogger, and SlackFeedbackLogger clients to be initialized on demand within request handlers. This prevents build-time failures when environment variables are not present.
• Dynamic BAML Client Import: Modified submitQuery to dynamically import baml_client at runtime, providing a fallback mechanism (returning top Pinecone docs) if the client is not available (e.g., if not generated during deployment).

Testing

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• Unit tests added/updated
• Manual testing performed (verified sage-backend builds successfully and outlined Slack configuration for functional testing)
• Tested in typescript/apps/sage-backend build environment

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• I have read and followed the contributing guidelines
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Additional Notes

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How to configure Slack:

1. Create a Slack app:
   • Enable Events API and subscribe to bot events: app_mention, message.im.
   • Set Request URL to: <your-sage-backend-url>/api/slack/events.
   • Install the bot to your workspace and note the Bot User OAuth Token.
2. Required Environment Variables (for deployment, e.g., Vercel):
   • SLACK_SIGNING_SECRET (from your Slack app settings)
   • SLACK_BOUNDARY_BOT_TOKEN (the Bot User OAuth Token)
   • OPENAI_API_KEY
   • PINECONE_API_KEY
   • Optional for logging: NOTION_BOUNDARY_BOT_TOKEN, NOTION_ASK_BAML_LOGS_DATABASE_ID
3. Usage in Slack: Mention the bot in a channel or DM it (e.g., @baamy find me a friday project).
4. BAML Client: The submitQuery function now uses an eval-based dynamic import for baml_client. If baml_client is not generated and available at runtime, the bot will provide a fallback response using Pinecone search results. Ensure baml_client is generated per baml_src/generators.baml for full functionality.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
_{Learn more about Cursor Agents}

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
promptfiddle	⬜️ Skipped			Aug 13, 2025 9:54pm

[github-actions]

🌿 Preview your docs: https://boundary-preview-2d6dbbcd-4746-4ab3-99ad-1ab31bbbb80c.docs.buildwithfern.com

[github-actions]

https://sage-backend-r0ly70tjt-baml.vercel.app

[hellovai]

@seawatts fyi the tests are all failing on:
https://sage-backend-r0ly70tjt-baml.vercel.app/

[seawatts]

Yea. Not going to merge this. It was a one shot prompt to see if cursor could do it. It failed.