Struct ToolError 

pub struct ToolError(/* private fields */);

A tool-execution failure, reported as isError tool content.

MCP separates protocol faults (unknown tool, arguments that do not match the schema – rejected before a tool body ever runs) from failures a tool body discovers itself. Only the first belongs in the JSON-RPC error field; the second is data the model reads and acts on, which is what rmcp::model::CallToolResult::is_error is for. Every helper below builds one of these instead of a raw ErrorData, so a tool signature that returns Result<_, ToolError> cannot surface a tmux or input refusal as a protocol error by construction.

Public, and re-exported at the crate root: a caller that invokes crate::TmuxTools’s methods directly, rather than over the wire, gets this type back and needs Self::into_error_data to read it.

Implementations

impl ToolError

pub fn into_error_data(self) -> ErrorData

Recover the underlying ErrorData.

For the one caller that reports a nested tool’s own failure inside a batch item rather than as this tool’s failure (crate::TmuxTools::call_read_tools_batch), and for a test that calls a tool directly and inspects the classification a wire client would otherwise read from isError content.

Trait Implementations

impl Debug for ToolError

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

Formats the value using the given formatter.

impl Display for ToolError

The message a model would read, so a direct caller can propagate a tool failure with ? like any other error.

fn fmt(&self, f: &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.

impl From<ErrorData> for ToolError

fn from(value: ErrorData) -> Self

Converts to this type from the input type.

impl IntoContents for ToolError

fn into_contents(self) -> Vec<ContentBlock>