Update a tool's configuration. This endpoint requires full object replacement — include all fields in the request, even those you are not changing, or they will be set to null.

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Important
Tool updates propagate immediately to all agents using the tool.

Agent as tool

When updating an agent-as-tool, the config.agent_id must match the original sub-agent. You cannot swap the underlying sub-agent—if you need a different one, delete this tool and create a new one.

For SDK examples and full constraints, see Agent as tool.