Enum ToolError 

pub enum ToolError {
    InvalidParams(String),
    PolicyRejected(String),
    SizeLimitExceeded(String),
    Internal(String),
}

Errors returned from ToolHandler::call.

Each variant maps to a JSON-RPC -32000 application-error response. The serve loop converts these to the wire format.

Variants

InvalidParams(String)

The caller supplied parameters that do not match the tool schema.

PolicyRejected(String)

A policy gate returned Reject, Quarantine, or BreakGlass.

Per ADR 0045 §3, a BreakGlass composed outcome is treated as Reject at the MCP boundary. No write occurs when this variant is returned.

SizeLimitExceeded(String)

The incoming payload exceeds the server-side size limit (RT-5).

Internal(String)

An unexpected internal error that is not one of the above categories.

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, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.