Struct ToolOutcome 

pub struct ToolOutcome {
    pub tool_name: String,
    pub tool_args: Value,
    pub success: bool,
    pub duration: Duration,
    pub error_message: Option<String>,
    pub attempt: u32,
}

Structured metadata about a completed tool execution.

Available via CallbackContext::tool_outcome() in after-tool callbacks, plugins, and telemetry hooks. Provides structured access to execution results without requiring JSON error parsing.

Fields

• tool_name — Name of the tool that was executed.
• tool_args — Arguments passed to the tool as a JSON value.
• success — Whether the tool execution succeeded. Derived from the Rust Result / timeout path, never from JSON content inspection.
• duration — Wall-clock duration of the tool execution.
• error_message — Error message if the tool failed; None on success.
• attempt — Retry attempt number (0 = first attempt, 1 = first retry, etc.). Always 0 when retries are not configured.

Fields

tool_name: String

Name of the tool that was executed.

tool_args: Value

Arguments passed to the tool (JSON value).

success: bool

Whether the tool execution succeeded.

duration: Duration

Wall-clock duration of the tool execution.

error_message: Option<String>

Error message if the tool failed. None on success.

attempt: u32

Retry attempt number (0 = first attempt, 1 = first retry, etc.). Always 0 when retries are not configured.

Trait Implementations

impl Clone for ToolOutcome

fn clone(&self) -> ToolOutcome

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ToolOutcome

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.