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# Function nemo_relay_event_tool_call_id

> Return the event tool call ID as a C string, or null if no tool call ID is set. Caller must free the result with `nemo_relay_string_free`.

Generated from `cargo doc --no-deps -p nemo-relay -p nemo-relay-adaptive -p nemo-relay-ffi`.

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Return the event tool call ID as a C string, or null if no tool call ID is set. Caller must free the result with `nemo_relay_string_free`.

## Safety

`ptr` must be a valid `FfiEvent` pointer or null.