Unlike webhook tools, system tools are not workspace resources shared across agents. The on/off state is stored per agent — toggling a system tool on one agent never affects another.
Toggle in the Builder
Open your agent’s Tools page in the Builder. The System tools card holds the Hang up call switch. The Language detection switch lives on the agent’s Configuration page, next to Speaking language — see Voice & language. Flip a switch to enable or disable that capability for this agent.Toggle via the API
Over the REST API, system tool switches are part of the agent’s configuration, in the sametools section that holds its attached webhook tools. See Configuration for reading and updating an agent’s config.
Transfer call
transfer_call has no switch of its own: it is enabled automatically once the agent has a transfer destination configured, and only on phone sessions — web sessions have no call to transfer. See Transfers for configuring destinations and everything else about transfers.
Going further
Tools overview
How webhook, client, and system tools fit together.
Webhook tools
Call your own HTTP endpoints from a conversation.
Client tools
Run tool calls inside your own app via the SDK.
Voice & language
Configure the agent’s voice and speaking language.