Add tools and handoffs to a Patter agent

Patter agents have two built-in tools (transfer_call, end_call) plus unlimited custom tools. Custom tools can be handler-based (your Python/TS function runs in-process) or webhook-based (the agent POSTs JSON arguments to your URL). Both shapes use the same Tool model. Output guardrails block or rephrase agent responses before they reach TTS.

Built-in tools (always available)

Every agent automatically has:

• transfer_call(target: str) — bridge to another phone number. Caller hears the new party, your Patter session ends.
• end_call() — hang up. Use for "goodbye" flows or abusive callers.

You don't have to register these. The LLM picks them when the system prompt authorizes it.