lc-langgraph 0.16.0

LangGraph - Graph-based orchestration framework for building stateful LLM applications
Documentation 
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// crates/lc-langgraph/src/errors.rs

use thiserror::Error;

/// Errors that can occur during graph construction and execution.
#[derive(Error, Debug)]
#[non_exhaustive]
pub enum GraphError {
    /// A graph validation check failed.
    #[error("Validation error: {0}")]
    ValidationError(String),

    /// An error occurred while executing the graph.
    #[error("Execution error: {0}")]
    ExecutionError(String),

    /// An error occurred while routing between nodes.
    #[error("Routing error: {0}")]
    RoutingError(String),

    /// The recursion limit was reached during execution.
    #[error("Recursion limit reached: {0}")]
    RecursionLimitReached(usize),

    /// A node reported an error.
    #[error("Node error: {0}")]
    NodeError(String),

    /// A checkpoint operation failed.
    #[error("Checkpoint error: {0}")]
    CheckpointError(String),

    /// A state update or merge failed.
    #[error("State error: {0}")]
    StateError(String),

    /// Execution was interrupted at the named node.
    #[error("Execution interrupted: {0}")]
    ExecutionInterrupted(String),

    /// Resuming execution failed.
    #[error("Resume error: {0}")]
    ResumeError(String),

    /// The graph contains a cycle with no path to `END`.
    #[error("Graph contains infinite cycle: {0}")]
    InfiniteCycleError(String),

    /// A node is unreachable from the entry point.
    #[error("Orphan node detected: {0}")]
    OrphanNodeError(String),

    /// Two edges duplicate the same source-target pair.
    #[error("Duplicate edge: {0}")]
    DuplicateEdgeError(String),

    /// A routing function returned a key with no matching target.
    #[error("Missing route target: {0}")]
    MissingRouteTargetError(String),

    /// An unexpected runtime error occurred.
    #[error("Runtime error: {0}")]
    RuntimeError(String),
}

/// Convenience result type for graph operations.
pub type GraphResult<T> = Result<T, GraphError>;