# ADR 041: Gemini Code Assist

- HTML version: https://robbiepalmer.me/projects/personal-site/adrs/041-gemini-code-assist
- Project: Personal Site (https://robbiepalmer.me/projects/personal-site.md)
- Status: Deprecated
- Date: 2026-06-20

# Deprecation

This decision is superseded by
[ADR 056: Stateful AI Code Review](/projects/personal-site/adrs/056-stateful-ai-code-review).
Google ended consumer Gemini Code Assist reviews on GitHub on July 17, 2026;
the integration now continues only for enterprise customers. Enterprise
billing and administration do not fit this solo public repository, so the
consumer reviewer has not been replaced with the enterprise product.

# Context

[ADR 009: CodeRabbit](/projects/personal-site/adrs/009-code-rabbit) records the decision to use automated AI review on Pull Requests and the broader reasons for keeping a review step in a solo-development workflow. This ADR does not repeat that rationale. It records why I added a second automated reviewer.

Relying on one review provider creates two risks:

1. **Review Blind Spots**: AI reviewers differ in the issues they notice and the recommendations they make. A single reviewer can repeatedly miss the same classes of problem.
2. **Provider Dependency**: A pricing, product, or availability change from CodeRabbit could remove the review step or slow down delivery while I evaluate a replacement.

Gemini Code Assist on GitHub has been available at no cost for public open-source repositories, making it possible to reduce these risks without adding a financial commitment.

# Decision

I will use **[Gemini Code Assist on GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code)** alongside CodeRabbit for automated code review on Pull Requests.

Gemini Code Assist is a complementary reviewer, not a replacement for CodeRabbit. The value comes from receiving an independent review from a different provider and model family. Its feedback often diverges from CodeRabbit's, increasing the chance that one reviewer identifies an issue or alternative that the other misses.

# Alternatives

## CodeRabbit Only

* **Pros**: Fewer review comments to process and only one service to configure.
* **Cons**: Concentrates review coverage and workflow continuity in one provider. A CodeRabbit pricing or product change could interrupt the review workflow and reduce delivery velocity.
* **Decision**: Rejected. Gemini Code Assist adds useful diversity at no cost for this public repository.

## Replace CodeRabbit with Gemini Code Assist

* **Pros**: Retains a single automated reviewer while avoiding dependence on CodeRabbit.
* **Cons**: Loses CodeRabbit's accumulated learnings and removes the diversity of feedback that justifies adopting Gemini Code Assist.
* **Decision**: Rejected. The services provide more value together than either provides alone.

# Consequences

## Positive

* **Diverse Feedback**: Independent reviewers surface different concerns, interpretations, and implementation options.
* **Reduced Provider Risk**: The review workflow is less exposed to pricing or availability changes from CodeRabbit.
* **Maintained Velocity**: If one reviewer becomes unavailable or uneconomical, the other can continue reviewing PRs while a replacement is evaluated.
* **No Additional Cost**: The consumer GitHub integration has been free for public open-source repositories.

## Negative

* **Additional Noise**: Two AI reviewers can produce duplicate, conflicting, or low-value comments that take time to assess.
* **No Guaranteed Consensus**: Agreement between two AI reviewers does not prove that a change is correct, and disagreement still requires human judgement.
* **Second Provider Dependency**: The approach reduces dependence on CodeRabbit but introduces dependence on Google's continued support for the integration.

# Deprecation History

Google has announced the **[sunset of the consumer version of Gemini Code Assist on GitHub](https://developers.google.com/gemini-code-assist/docs/deprecations/consumer-code-review)**. New consumer installations are blocked from June 18, 2026, and consumer code review activity will cease on July 17, 2026. The enterprise version is not affected.

The ADR changed to **Deprecated** after consumer review activity ceased on July
17, 2026.

The enterprise GitHub integration is currently in Preview and requires Google Cloud billing, IAM configuration, and a Developer Connect connection in `us-east1`. Google does not publish product-specific pricing for it. Its uncertain post-preview cost and additional operational overhead make it unsuitable as a direct continuation of the original no-cost decision.

---

Markdown index of this site: https://robbiepalmer.me/llms.txt