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Guild supports Gemini models from Google. This page lists the models Guild recognizes, the inference providers that serve them, and how to call them from an agent.

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Inference providers

You can reach these models through the Google AI API itself or through a third-party provider. Write the canonical model name, such as gemini-3.5-flash, everywhere in Guild. Guild maps it to each provider’s own model ID.

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Models

Guild prices and recognizes these Gemini model IDs. A policy or preference can also name any other model your credential can reach.

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Set up Gemini

On a managed account, agents can use Gemini models without a credential, as long as Guild holds a managed key for Gemini. To use your own Gemini account instead, add a credential. Adding your first credential switches the whole account to bring your own key (BYOK).
1

Open Models & providers

Click Access & setup in the left nav, then Models & providers. In an organization, only admins can open it.
2

Add a credential

Click Add API key and choose an inference provider from the table above.
3

Enter the provider's secret

Give the credential a Name and paste your provider’s API key. AWS Bedrock asks for an IAM role and region instead.
4

Choose Gemini

Under Models, check Gemini. Keep gemini-3.5-flash as its default model or enter another from the list above. Then click Add Key.
To control which workspaces and agents can use Gemini models, add a model policy for the credential. For example, --models "gemini-*-flash" limits a policy to matching models:

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Use it from an agent

Agent code never names a credential. Guild resolves the call against the workspace owner’s settings. To ask for Gemini explicitly, put it in llmPreferences:
The first entry asks for gemini-3.1-pro-preview. The second falls back to the default model of the matching policy. Preferences are strict: if no credential or policy allows any of them, the call fails rather than using another publisher. See LLM preferences.

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Notes

  • Guild requests Gemini’s thoughts, so the session can show reasoning progress.
  • Gemini accepts a narrower JSON Schema than other publishers. Guild rewrites tool and structured-output schemas to fit before it sends them.
  • In traces, Gemini calls carry the provider name gcp.gemini, following the OpenTelemetry GenAI conventions.
  • Models & providers for credentials, model policies, and the daily token limit
  • LLMs for task.llm and the unified LLM proxy
  • Usage for spend by model