Rig Core

name: Rig Core Architecture globs: "**/*.rs" alwaysApply: false

Apply these Rig architectural constraints when editing Rust code.

rig-core-patterns

Rig is built on several core principles that all contributions must respect:

Trait-Based Abstractions

Rig uses traits to define provider-agnostic interfaces:

• CompletionModel - For text completion/chat models
• EmbeddingModel - For embedding generation
• VectorStoreIndex - For vector similarity search
• Tool - For defining callable tools

New implementations should implement these traits rather than creating parallel abstractions.

Builder Pattern

Nearly every configurable type uses the builder pattern:

let agent = client
    .agent(openai::GPT_5_2)
    .preamble("System prompt")
    .tool(my_tool)
    .temperature(0.8)
    .build();

Follow this pattern for any new configurable types.

Generic Client Architecture

The client system uses a generic architecture with provider extensions:

pub struct Client<Ext = Nothing, H = reqwest::Client> {
    // ...
}

Where Ext is a provider extension defining capabilities and H is the HTTP backend.

Capability-Based Providers

Providers declare their capabilities explicitly:

impl<H> Capabilities<H> for MyProviderExt {
    type Completion = Capable<CompletionModel<H>>;  // Supported
    type Embeddings = Nothing;                       // Not supported
    // ...
}

Use Capable<T> for supported features and Nothing for unsupported ones.