AbortError

Thrown when ctx.abort(reason) is called in any middleware hook.

This is a hard stop — it unwinds the entire onion stack up to the session level and rejects the AgentRun.result promise. No LLM call is made after abort.

Example

// In a middleware:
turn: async (ctx, next) => {
  if (ctx.state.totalCost > 1.00) ctx.abort("Budget exceeded")
  await next()
}

Extends

• AgentExpressError

Constructors

Constructor

new AbortError(reason): AbortError

Parameters

reason

string

Returns

AbortError

Overrides

AgentExpressError.constructor

Properties

cause?

readonly optional cause?: Error

Original error that caused this one, if any.

Inherited from

AgentExpressError.cause

---

code

code: string

Machine-readable error code (e.g., “ABORT”, “RATE_LIMIT”, “TOOL_DENIED”).

Inherited from

AgentExpressError.code

---

reason

readonly reason: string

The reason passed to ctx.abort().

---

retryable

readonly retryable: boolean

Whether this error can be retried by retry middleware.

Inherited from

AgentExpressError.retryable