Enum RunError 

pub enum RunError {
    EmptyPrompt,
    BudgetExhausted {
        limit: u64,
        spent: u64,
    },
    NoSuchSession,
    Context(ContextError),
    Provider(ProviderError),
    Runtime(RuntimeError),
    OutputMismatch(Error),
    Sink(Error),
    Forwarder(JoinError),
    Skills(SkillLoadError),
    Mcp(McpError),
    Templates(TemplateError),
    Hooks(HookConfigError),
}

Anything that can go wrong opening a workspace, preparing a run, or driving one.

One error type across all three, rather than a WorkspaceError beside it: opening a workspace exists to prepare runs, and every failure listed here is a failure a caller of run has always been able to receive.

Variants

EmptyPrompt

BudgetExhausted

The shared allowance this turn draws on has nothing left.

A decision rather than a failure of the work, which is why it is its own variant: a caller fanning out over a BudgetPool stops minting on this, where it would retry on a provider error. Raised before the prompt is sent and before the stream opens, so the conversation is left exactly as it was.

Fields

limit: u64

spent: u64

NoSuchSession

Context(ContextError)

Provider(ProviderError)

Runtime(RuntimeError)

OutputMismatch(Error)

A typed turn answered, but not in the shape that was asked for.

Separate from Runtime because the two call for different reactions and basis can tell them apart honestly: this one is basis’s own verdict. The typed path asks mentra for the raw payload and deserializes it here, so a value that does not fit T is a schema or prompt problem — retry with a clearer schema — while a provider failure is not. The exchange stays in the session’s transcript either way; see PreparedRun::output.

Sink(Error)

Forwarder(JoinError)

Skills(SkillLoadError)

Mcp(McpError)

Templates(TemplateError)

Hooks(HookConfigError)

Trait Implementations

impl Debug for RunError

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

Formats the value using the given formatter.

impl Display for RunError

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

Formats the value using the given formatter.

impl Error for RunError

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<ContextError> for RunError

fn from(source: ContextError) -> Self

Converts to this type from the input type.

impl From<Error> for RunError

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<HookConfigError> for RunError

fn from(source: HookConfigError) -> Self

Converts to this type from the input type.

impl From<JoinError> for RunError

fn from(source: JoinError) -> Self

Converts to this type from the input type.

impl From<McpError> for RunError

fn from(source: McpError) -> Self

Converts to this type from the input type.

impl From<ProviderError> for RunError

fn from(source: ProviderError) -> Self

Converts to this type from the input type.

impl From<RuntimeError> for RunError

fn from(source: RuntimeError) -> Self

Converts to this type from the input type.

impl From<SkillLoadError> for RunError

fn from(source: SkillLoadError) -> Self

Converts to this type from the input type.

impl From<TemplateError> for RunError

fn from(source: TemplateError) -> Self

Converts to this type from the input type.