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// Pre-built agent configurations
//
// This module provides pre-built agent configurations like `ReactAgentConfig`
// for common agent patterns.
use std::marker::PhantomData;
use std::sync::Arc;
use crate::llm::{ChatModel, ResponseFormat};
use crate::node::Node;
use crate::state::State;
use crate::store::Store;
/// `ReAct` agent configuration
///
/// Configuration for creating `ReAct` (Reasoning + Acting) agents with tools.
#[allow(
missing_debug_implementations,
reason = "Contains Arc<dyn Node> and Arc<dyn Fn> which don't implement Debug"
)]
pub struct ReactAgentConfig<S: State, M: ChatModel> {
/// LLM model
pub model: M,
/// List of tools
pub tools: Vec<Box<dyn crate::Tool>>,
/// System prompt
pub prompt: Option<PromptSource<S>>,
/// Response format for structured output
pub response_format: Option<ResponseFormat>,
/// Pre-model hook node
pub pre_model_hook: Option<Arc<dyn Node<S>>>,
/// Post-model hook node
pub post_model_hook: Option<Arc<dyn Node<S>>>,
/// State schema marker
pub state_schema: PhantomData<S>,
/// Store for cross-thread data
pub store: Option<Arc<dyn Store>>,
/// Interrupt before these nodes
pub interrupt_before: Vec<String>,
/// Interrupt after these nodes
pub interrupt_after: Vec<String>,
/// Dynamic model selector
pub model_selector: Option<ModelSelector<S, M>>,
}
/// Type alias for model selector function
pub type ModelSelector<S, M> = Arc<dyn Fn(&S) -> M + Send + Sync>;
impl<S: State, M: ChatModel> ReactAgentConfig<S, M> {
/// Create new `ReAct` agent configuration
///
/// # Arguments
///
/// * `model` - LLM model
/// * `tools` - List of tools
pub fn new(model: M, tools: Vec<Box<dyn crate::Tool>>) -> Self {
Self {
model,
tools,
prompt: None,
response_format: None,
pre_model_hook: None,
post_model_hook: None,
state_schema: PhantomData,
store: None,
interrupt_before: vec![],
interrupt_after: vec![],
model_selector: None,
}
}
/// Set system prompt
///
/// # Arguments
///
/// * `prompt` - Prompt source
#[must_use]
pub fn with_prompt(mut self, prompt: PromptSource<S>) -> Self {
self.prompt = Some(prompt);
self
}
/// Set response format
///
/// # Arguments
///
/// * `format` - Response format
#[must_use]
pub fn with_response_format(mut self, format: ResponseFormat) -> Self {
self.response_format = Some(format);
self
}
/// Set pre-model hook
///
/// # Arguments
///
/// * `hook` - Hook node
#[must_use]
pub fn with_pre_model_hook(mut self, hook: Arc<dyn Node<S>>) -> Self {
self.pre_model_hook = Some(hook);
self
}
/// Set post-model hook
///
/// # Arguments
///
/// * `hook` - Hook node
#[must_use]
pub fn with_post_model_hook(mut self, hook: Arc<dyn Node<S>>) -> Self {
self.post_model_hook = Some(hook);
self
}
/// Set store
///
/// # Arguments
///
/// * `store` - Store instance
#[must_use]
pub fn with_store(mut self, store: Arc<dyn Store>) -> Self {
self.store = Some(store);
self
}
/// Set interrupt before
///
/// # Arguments
///
/// * `nodes` - List of node names
#[must_use]
pub fn with_interrupt_before(mut self, nodes: Vec<String>) -> Self {
self.interrupt_before = nodes;
self
}
/// Set interrupt after
///
/// # Arguments
///
/// * `nodes` - List of node names
#[must_use]
pub fn with_interrupt_after(mut self, nodes: Vec<String>) -> Self {
self.interrupt_after = nodes;
self
}
/// Set model selector
///
/// # Arguments
///
/// * `selector` - Function to select model based on state
#[must_use]
pub fn with_model_selector(mut self, selector: ModelSelector<S, M>) -> Self {
self.model_selector = Some(selector);
self
}
}
/// Prompt source for agents
///
/// Can be a static string or a dynamic function.
#[allow(
missing_debug_implementations,
reason = "Contains Arc<dyn Fn> which doesn't implement Debug"
)]
pub enum PromptSource<S: State> {
/// Static prompt string
Static(String),
/// Dynamic prompt function
Dynamic(Arc<dyn Fn(&S) -> String + Send + Sync>),
}
// Rust guideline compliant 2026-05-19