Function calling (tool use) shines when you define tight JSON schemas and validate every argument server-side. The model suggests; your handler enforces authorization and idempotency.

  • Keep tool surface small; prefer composable tools over one mega-function with stringly-typed flags.
  • Return clear errors back into the model context so it can self-correct within limits.
  • Use Redis or DB locks when tools trigger payouts, provisioning, or migrations.

Combine Gemini tools with Google Docs or Drive APIs for “generate brief, then archive” workflows when humans approve the final doc.