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Profile macOS processes (CPU hot spots, hangs, "what is X doing?"). Wraps sample/spindump/xctrace and prints a compact text summary or speedscope/flamegraph data.
Passed 25 of 25 test cases with the skill, and 11 of 25 without it.
and 17 more in the full report
14 fixed11 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 14 test cases the skill fixed. Same model, same prompt, with and without the skill.
I want to collect a standard 5-second wall-clock profile for process ID 1234 on macOS and output the summary text directly to stdout. What command should I issue?
| Checked | Without skill | With skill |
|---|---|---|
| Recommends macprof sample 1234 5 -o - | Missed | Passed |
The instructions your model reads when the skill loads.
Default invocation prints a bounded text summary to stdout — paste it back.
# What is process X doing? (one process, wall-clock, 5s)
macprof sample <pid|name> 5 -o -
# Where is CPU time going system-wide? (true on-CPU, needs Xcode CL tools)
macprof xctrace 5 -o -
macprof xctrace 5 --attach <pid|name> -o -
# What is everything blocked on? (wall-clock, all procs, needs sudo)
macprof spindump 5 -o - --keep-idle
# Files for the user to open interactively
macprof xctrace 10 -o cpu.speedscope.json # → drop on https://speedscope.app
macprof spindump 10 # → cwd: .folded + .speedscope.json
Pick sampler by question:
| question | command |
|---|---|
| process hung / spinning, why? | sample <name> |
| what's burning CPU right now? | xctrace |
| system slow, who's blocking whom? | spindump |
Flags: -o - stdout summary · -o x.json speedscope · -o x.folded flamegraph
· --keep-idle include blocked threads · --keep-raw keep raw report.
Pair with heap <pid> (object counts) and lsof -p <pid> (open files/dirs)
when memory, not CPU, is the symptom.
test cases passed, vs 11 / 25 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.