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native-app-performance

Native app performance: xctrace, Time Profiler, traces, hotspots.

67

Quality

80%

Does it follow best practices?

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SecuritybySnyk

Passed

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tessl review fix ./skills/native-app-performance/SKILL.md
SKILL.md
Quality
Evals
Security

Quality

Content

87%

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

The body is a tight, highly actionable CLI playbook that externalizes real scripts and stays free of padding. Its main gap is the absence of an explicit validation checkpoint in the capture-to-symbolication workflow.

Suggestions

Insert an explicit validation step between extract and symbolicate, e.g. 'Confirm /tmp/time-sample.xml is non-empty and contains <node> entries before symbolication.'

Add a brief error-recovery loop: if symbolication yields unresolved addresses, re-check the load address via vmmap and confirm the --binary path matches the traced build.

DimensionReasoningScore

Conciseness

The body is lean: numbered CLI commands, short workflow notes, a script listing, and gotchas, with no padding explaining what xctrace or a Time Profiler is; every token earns its place and it assumes Claude's competence.

3 / 3

Actionability

Fully executable, copy-paste-ready commands such as `xcrun xctrace record --template 'Time Profiler' --time-limit 90s ...` and concrete script invocations with arguments provide specific, runnable guidance.

3 / 3

Workflow Clarity

The numbered 1-5 sequence (record, extract, get load address, symbolicate) is clear, and gotchas offer light error recovery, but there is no explicit validation checkpoint (e.g. confirm samples exported non-empty) in the main flow, leaving checkpoints implicit.

2 / 3

Progressive Disclosure

Content is well organized into Quick start, Workflow notes, Included scripts, and Gotchas, with the heavy logic externalized into three real bundled scripts referenced one level deep and clearly signaled.

3 / 3

Total

11

/

12

Passed

Description

72%

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description is a concise, distinct topic list for a narrow Apple-profiling niche with strong natural trigger terms, but it omits concrete actions and any explicit 'when to use' guidance. Adding a verb-led capability clause and a 'Use when...' trigger would raise specificity and completeness.

Suggestions

Lead with concrete actions, e.g. 'Records Time Profiler traces via xctrace, extracts samples, symbolicates, and ranks hotspots.'

Add an explicit trigger clause such as 'Use when profiling native Apple app performance, investigating CPU hotspots, or when the user mentions xctrace or Time Profiler.'

DimensionReasoningScore

Specificity

Quotes like "xctrace, Time Profiler, traces, hotspots" name concrete tools and the domain (native app performance) but include no verbs describing actions performed, matching the anchor that names domain and some specifics without comprehensive actions; it is more concrete than the score-1 "Helps with documents" but lacks the multiple explicit actions of score 3.

2 / 3

Completeness

It conveys a vague "what" via the topic list but provides no "Use when..." clause or equivalent explicit trigger guidance, so per the judging guidelines completeness is capped at 2.

2 / 3

Trigger Term Quality

Terms such as "native app performance", "xctrace", "Time Profiler", "traces", and "hotspots" are exactly what a developer profiling an app would naturally say, giving good coverage of natural domain keywords.

3 / 3

Distinctiveness Conflict Risk

"Native app performance" scoped to "xctrace" and "Time Profiler" is a clear, narrow niche with distinct triggers unlikely to fire for unrelated skills.

3 / 3

Total

10

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12

Passed

Validation

100%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository
steipete/agent-scripts
Reviewed

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