defaults

defaults(opts?): Middleware[]

Returns the standard set of default middleware for common use cases.

Included in every Agent automatically unless defaults: false is set. Can also be called directly for advanced composition.

Includes:

• model.retry() — exponential backoff for transient LLM failures
• observe.usage() — token tracking → state['observe:usage']
• observe.tools() — tool call recording → state['observe:tools']
• observe.duration() — turn timing → state['observe:duration']
• guard.maxIterations() — loop iteration limit (default 25)

Parameters

opts?

DefaultsOptions

Optional customization of default middleware behavior

Returns

Middleware[]

Array of middleware to pass to agent.use()