goose-provider-types

The provider contract and the conversation types that flow through it. This is the crate to depend on if you want to implement a provider, or to work with goose messages without pulling in the whole agent.

Provider implementations live in goose-providers, which re-exports every module here.

The Provider trait

#[async_trait]
pub trait Provider: Send + Sync {
    fn get_name(&self) -> &str;

    async fn stream(
        &self,
        model_config: &ModelConfig,
        system: &str,
        messages: &[Message],
        tools: &[Tool],
    ) -> Result<MessageStream, ProviderError>;
}

stream is the only required method. Everything else has a default:

• complete collects the stream into a single (Message, ProviderUsage).
• get_context_limit falls back to the model config's limit.
• fetch_supported_models / fetch_supported_model_info / fetch_model_info describe the provider's inventory; fetch_recommended_models filters it through the bundled canonical registry (and keeps tool-less models when toolshim emulation is on).
• retry_config, resume, and provider_session_id cover retries and provider-side session state.

A MessageStream yields partial text but complete tool calls — a text chunk may be a single word, while a tool call is only emitted once fully assembled. Helpers: collect_stream and stream_from_single_message.

Static metadata is declared separately through ProviderDescriptor::metadata(), returning ProviderMetadata with its ConfigKeys, models, and any ProviderDeprecation.

Modules