Context

Drivers currently detect Function as a Service (FaaS) platforms via environment variables per the MongoDB Handshake spec

Current detection uses: AWS_EXECUTION_ENV, FUNCTIONS_WORKER_RUNTIME, K_SERVICE, VERCEL

Spike Goals

1. Identify which Cloudflare Workers runtime environment variables are available and stable for detection
2. Determine if Cloudflare Workers exposes any runtime environment variables (Wrangler system variables like CLOUDFLARE_ACCOUNT_ID are dev/deployment only, not runtime)
3. Define which variable(s) should be added to the handshake spec
4. Estimate effort to update specs and drivers

Success Criteria

• Document which environment variable(s) to use for Cloudflare Workers detection
• Confirm the chosen variable(s) won't change
• List which drivers need updates

References

• Wrangler system environment variables
• MongoDB FaaS Handshake Spec