dev

const dev: object

Type Declaration

console

console: (config?) => Middleware = devConsole

Full agent lifecycle terminal trace for development.

Creates a dev.console() middleware that prints the full agent lifecycle to stderr in a human-readable format.

Shows: session start/end, turns, model calls (model, tokens, cost, duration), tool executions (name, args, duration), guard results, and errors.

Parameters

config?

DevConsoleConfig

Optional configuration with custom formatter

Returns

Middleware

Middleware that prints lifecycle to terminal

Example

agent.use(dev.console())
// Output:
// ┌ session s-abc123
// │  → turn #0
// │  │  → model.call  sonnet  tokens: 150→85  $0.003  847ms
// │  │  → tool.exec   search  234ms
// │  │  → model.call  sonnet  tokens: 320→120 $0.005  612ms
// │  → turn #0 done  $0.008  1693ms
// └ session done  $0.008  1 turn