fix(slack): use validated env for Anthropic API key

[saddlepaddle]

Summary

• Anthropic SDK was using implicit process.env.ANTHROPIC_API_KEY which wasn't set in Vercel deployments, causing Could not resolve authentication method errors
• Now uses validated env.ANTHROPIC_API_KEY from the API's env.ts (Zod-validated at build time)
• Added ANTHROPIC_API_KEY to deploy-preview and deploy-production workflows
• Removed unused ANTHROPIC_API_KEY from trpc env.ts

Test plan

• Deploy to preview and trigger a Slack mention — verify agent no longer errors with auth resolution failure

Summary by CodeRabbit

• Chores
  • Updated deployment configuration to properly handle API credentials across environments.
  • Refined environment variable configuration and validation for the API service.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request adds ANTHROPIC_API_KEY environment variable configuration across the codebase. The key is added to GitHub Actions deployment workflows, integrated into environment schemas, and used for Anthropic client initialization in the Slack agent service.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflows .github/workflows/deploy-preview.yml, .github/workflows/deploy-production.yml	Added ANTHROPIC_API_KEY to environment configuration in both preview and production deployment jobs, ensuring the API key is passed to Vercel during deployment.
Environment Schema Configuration apps/api/src/env.ts, packages/trpc/src/env.ts	Added ANTHROPIC_API_KEY as a string variable to the server environment schema in the API package; removed it from the tRPC package schema. Also relaxed SLACK_SIGNING_SECRET validation from required to optional.
Agent Implementation apps/api/src/app/api/integrations/slack/events/utils/run-agent/run-agent.ts	Updated Anthropic client initialization to explicitly use the ANTHROPIC_API_KEY from environment configuration instead of relying on default credentials.

Possibly Related PRs

• fix: pass runtime env vars to Vercel deploy #350: Modifies Vercel deploy workflows to pass runtime environment variables during deployment, similar pattern for passing secrets through to deployed services.
• fix(slack): replace Slack MCP stdio client with direct web API #1066: Restructures the Slack agent implementation in the same run-agent.ts file, potential for conflicts with Anthropic client initialization changes.

Poem

🐰 Hops through the workflows with key in paw,
Environment variables, none without flaw,
From preview to production, the secrets now flow,
Anthropic awaits—let the agents go! ✨

Estimated Code Review Effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: using validated env for the Anthropic API key instead of implicit process.env.
Description check	✅ Passed	The description covers the issue, solution, changes made, and includes a test plan, but is missing a formal Description section and Related Issues link per the template.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch satya-patel/anthropic-api-key

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[github-actions]

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