Error message
caller-declared tool names collide with the tools the harness provides (bash, file_read, file_write, job_monitor, sleep, wait_for): sleep.
When this error occurs
POST /agents/conversations or POST /agents/conversations/{id}/runs with config_override was called with a tools[].name that matches one of the platform-provided harness tools. Those names are reserved so the model always sees the platform’s implementation for that name — a sandbox tool, or one of the waiting primitives (sleep, job_monitor, wait_for).