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chore(.gemini): add GEMINI.md context file #3385

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25 changes: 25 additions & 0 deletions .gemini/GEMINI.md
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# Google API Go Client (`google-api-go-client`) Context

## Repository Overview
This repository contains the auto-generated Go client libraries for Google APIs, based on the **Discovery API**.

* **Nature of Code:** Almost every top-level directory (e.g., `calendar/`, `drive/`, `sheets/`) corresponds to a Google API and is **auto-generated**.
* **Editing:** Avoid manual edits to specific API clients unless absolutely necessary for debugging. Changes should ideally happen in the generator or the source discovery doc.

## Key Directories
While most directories are clients, the following are the core libraries that support them:

* `googleapi/`: Contains common types, error handling, and JSON helpers used across all clients. **High importance** for cross-cutting concerns.
* `transport/`: Handles HTTP transport, authentication, and connection pooling. **Critical** for networking behavior.
* `option/`: Configuration options for clients (e.g., API keys, credentials, endpoints).
* `idtoken/`: Functionality for validating and generating Google ID tokens.
* `internal/`: Shared internal logic.

## Architecture & Wiring
* **Transport Creation (`transport/http/dial.go`):** This is the **critical chokepoint** for all HTTP clients. `NewClient` calls `dial`, which constructs the `http.Client`.
* **Instrumentation Point:** This is the exact location to wrap the `http.Transport` (e.g., with OpenTelemetry) or inject middleware.
* **Configuration:** Users configure clients using `option.ClientOption` (found in `option/`).
* **`option.WithTracerProvider`:** This option flows into `dial.go` and determines the tracing provider.
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@westarle westarle Nov 26, 2025

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Are all these details helpful outside the scope of work on tracing? My only concern is that this is sort of a "partial" architecture description that might limit the focus.

If the real meat of the clients is all in dial and ClientOption then this makes sense.


## Context
* **Difference from `google-cloud-go`:** These clients are based on the JSON Discovery format. They are typically pure REST/HTTP clients. The clients in `google-cloud-go` are often gRPC-based (GAPIC) and considered "idiomatic" for Google Cloud Platform services.