> ## Documentation Index > Fetch the complete documentation index at: https://praison.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # Handoff Chain • Rust AI Agent SDK > HandoffChain: Thread-safe handoff chain tracker. # HandoffChain > Defined in the [**handoff**](../modules/handoff) module. Rust AI Agent SDK Thread-safe handoff chain tracker. ## Fields | Name | Type | Description | | ------- | -------------------------------------------- | ----------- | | `chain` | `std::sync::RwLock<Vec<String>>` | - | ## Methods ### `new` ```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}} fn new() -> Self ``` Create a new handoff chain ### `get` ```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}} fn get(&self) -> Vec ``` Get current chain ### `depth` ```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}} fn depth(&self) -> usize ``` Get current depth ### `push` ```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}} fn push(&self, agent_name: impl Into) -> () ``` Push agent to chain **Parameters:** | Name | Type | | ------------ | ------------------------- | | `agent_name` | `impl Into<String>` | ### `pop` ```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}} fn pop(&self) -> Option ``` Pop agent from chain ### `contains` ```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}} fn contains(&self, agent_name: &str) -> bool ``` Check if agent is in chain (cycle detection) **Parameters:** | Name | Type | | ------------ | ------ | | `agent_name` | `&str` | ### `clear` ```rust theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}} fn clear(&self) -> () ``` Clear the chain ## Source `praisonai/src/handoff/mod.rs` at line 442 *** ## Related Documentation