Enum EngineFault 

pub enum EngineFault {
    UnknownTool(String),
    BadArgs(String),
    Transport(String),
}

Engine fault: the dispatcher could not even run the tool (unknown tool, bad arguments, transport down). Surfaces as a non-zero CLI exit; on MCP, UnknownTool is a JSON-RPC -32602 protocol error and the rest are isError: true results (A4 mapping in scrybe-mcp-server/src/server.rs). Distinct from a business ToolError carried inside the outcome (design §2.2, §5).

Variants

UnknownTool(String)

No tool with this name is registered.

BadArgs(String)

Arguments failed validation before the handler ran.

Transport(String)

The transport to the live app failed mid-request — socket I/O, timeouts, oversized/garbled frames, or a malformed JSON-RPC envelope. The app did NOT answer, so there is no business outcome to report: this is an engine fault, never a tool_error. (The two conditions the app does answer for stay business outcomes: no app at all → no_live_app, and an in-band remote error → app_error.)

Trait Implementations

impl Debug for EngineFault

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

Formats the value using the given formatter.

impl Display for EngineFault

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

Formats the value using the given formatter.

impl Eq for EngineFault

impl Error for EngineFault

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 PartialEq for EngineFault

fn eq(&self, other: &EngineFault) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for EngineFault