Agent Engineering
Tool Call ID
An identifier connecting a particular model-requested tool invocation to its returned result. It distinguishes calls even when they use the same function. It is a protocol correlation value, not automatically an authorization credential or a durable idempotency key for business actions.
Also called: tool_call_id, tool_use_id
Reviewed
Sources
Member lesson
The definition and sources are public. The complete practical lesson is for members.