The four tools map to distinct actions: starting a job, checking status, cancelling, and listing backends. There is no overlap in purpose, so an agent should be able to select the correct one without ambiguity.

Naming is mixed: separate_stems follows verb_noun, while stem_job_status and stem_backends are noun phrases and stem_job_cancel reverses the object/verb order. A consistent pattern such as get_stem_job_status, cancel_stem_job, and list_stem_backends would make the set more predictable.

Four tools is well-scoped for a job-based audio stem separation server. Every tool covers a necessary lifecycle action without redundancy.

The core job lifecycle is covered: start, inspect status, and cancel, plus backend discovery. A minor gap is the lack of an explicit result-retrieval or cleanup tool, though status may expose stem outputs indirectly.