Enum ToolError 

#[non_exhaustive]
pub enum ToolError {
    ToolNotFound {
        name: Cow<'static, str>,
    },
    InvalidParameters {
        tool: Cow<'static, str>,
        message: Cow<'static, str>,
    },
    ExecutionFailed {
        tool: Cow<'static, str>,
        message: Cow<'static, str>,
    },
    SchemaValidation {
        tool: Cow<'static, str>,
        message: Cow<'static, str>,
    },
    RegistrationError {
        message: Cow<'static, str>,
    },
    SerializationError {
        tool: Cow<'static, str>,
        source: Error,
    },
    TimeoutError {
        tool: Cow<'static, str>,
        timeout: Duration,
    },
    ExecutionPanicked {
        tool: Cow<'static, str>,
    },
}

Error returned while registering, validating, or executing a tool.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

ToolNotFound

The requested tool is not registered.

Fields

name: Cow<'static, str>

Name of the missing tool.

InvalidParameters

The supplied parameters were invalid for the tool.

Fields

tool: Cow<'static, str>

Name of the tool.

message: Cow<'static, str>

Why the parameters were invalid.

ExecutionFailed

Tool execution failed at runtime.

Fields

tool: Cow<'static, str>

Name of the tool.

message: Cow<'static, str>

What went wrong during execution.

SchemaValidation

The tool’s JSON schema validation failed.

Fields

tool: Cow<'static, str>

Name of the tool.

message: Cow<'static, str>

Schema-validation error detail.

RegistrationError

Tool registration failed (duplicate name, …).

Fields

message: Cow<'static, str>

Why registration failed.

SerializationError

(De)serialization for a tool payload failed.

Fields

tool: Cow<'static, str>

Name of the tool.

source: Error

Underlying serde error.

TimeoutError

Tool execution exceeded its timeout.

Note: the timeout cancels only the local execution future. For a tool backed by a remote service (e.g. an MCP tool, or any tool that performs I/O), the request may already be on the wire and the remote side effect may still occur. A timed-out call is not cached, and because TimeoutError is retryable the same call may be issued more than once — so keep per-call timeouts conservative for non-idempotent tools.

Fields

tool: Cow<'static, str>

Name of the tool.

timeout: Duration

Configured timeout that was exceeded.

ExecutionPanicked

A tool handler panicked while it was being polled.

Panic payloads are deliberately omitted because they may contain sensitive data and are not a stable error interface.

Fields

tool: Cow<'static, str>

Name of the tool whose handler panicked.

Implementations

impl ToolError

pub fn is_retryable(&self) -> bool

Determine if the error is retryable

Trait Implementations

impl Debug for ToolError

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

Formats the value using the given formatter.

impl Display for ToolError

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

Formats the value using the given formatter.

impl Error for ToolError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.