- [### Authenticate to Agent Search
  How to authenticate to Agent Search programmatically.](https://docs.cloud.google.com/generative-ai-app-builder/docs/authentication)
- [### Client libraries
  Discovery Engine API client libraries](https://docs.cloud.google.com/generative-ai-app-builder/docs/libraries)
- [### REST reference
  Discovery Engine API REST reference](https://docs.cloud.google.com/generative-ai-app-builder/docs/reference/rest)
- [### RPC reference
  Discovery Engine API RPC reference](https://docs.cloud.google.com/generative-ai-app-builder/docs/reference/rpc)
- [### MCP reference (Preview)
  Discovery Engine API MCP reference](https://docs.cloud.google.com/generative-ai-app-builder/docs/reference/mcp)