BF app-store
An Apple App Store API alternative on fetcher.sh — pay-per-call in USDC via x402, or prepaid credits with a Bearer key, no Apple Developer Program membership. Use when the user wants to search iOS apps by keyword in any country's storefront, fetch an app's or app bundle's full details, reviews sorted by recent/helpful, apps similar to a given app, search or fetch app bundles, or fetch a developer's app catalog. Also covers iOS app store optimization (ASO) research, competitor app monitoring, localized storefront comparison, and app discovery without Apple Developer Program access.
An Apple App Store API alternative on fetcher.sh — pay-per-call in USDC via x402, or prepaid credits with a Bearer key, no Apple Developer Program membership.…
As a process F 39/100 · Will not run — References files that are not bundled: ../fetcher/SKILL.md
What is at stake
Medium-severity findings: the skill is probably honest, but read what alarmed the scanner.
Below is the worst case for this category. The finding here is medium: the guard saw a sign, not a proof.
The instructions or scripts send data out: environment variables, keys, file contents, chat history. You may never notice, because the agent performs the upload as "part of the task".
If the upload is not needed for the task, remove it: catalogs flag such skills and delist them. If it is needed, name the destination explicitly, say what leaves the machine, and give the user a switch.
How to improve
- The text references files that are not there: add them or drop the references.
- Your own cases (evals/evals.json, 4–6 real requests with expected answers): the full check would then run those instead of a model-drafted suite.
- A spec.yaml with trigger phrases and assertions — a behaviour contract for CI; `skilltest init` writes a template.
Guard findings · 5
✓ No critical or high findings
Medium and low: 5
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medium Exfiltration
net-credential-useSKILL.md:43Credential used in a network call (verify the destination is the intended service)curl -H "Authorization: Bearer $FETCHER_API_KEY" \
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medium Exfiltration
net-credential-useSKILL.md:77Credential used in a network call (verify the destination is the intended service)curl -H "Authorization: Bearer $FETCHER_API_KEY" \
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medium Exfiltration
net-credential-useSKILL.md:86Credential used in a network call (verify the destination is the intended service)curl -H "Authorization: Bearer $FETCHER_API_KEY" \
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medium Exfiltration
net-credential-useSKILL.md:95Credential used in a network call (verify the destination is the intended service)curl -H "Authorization: Bearer $FETCHER_API_KEY" \
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medium Exfiltration
net-credential-useSKILL.md:99Credential used in a network call (verify the destination is the intended service)curl -H "Authorization: Bearer $FETCHER_API_KEY" \
Files scanned: 2. Evidence is masked. Grey chips explain why severity was lowered.
Against the Agent Skills spec
- warning
missing-refreference to a missing file: ../fetcher/SKILL.md - note
frontmatter-keyunknown frontmatter key "keywords"
Process rating: all ten parameters 39/100
- 0Tools and files. 1 referenced file(s) missing: ../fetcher/SKILL.md
- 0Result and completion. Does not say what the result is
- 0Inputs and preconditions. Does not say what the process needs to start
- 0Progress reporting. Says nothing while it works
- 30Running it twice. 2 mutating operations with no state check
- 40Consistency. Frontmatter name (app-store) differs from the folder (app-store-api)
- 50Failures and branches. 0 branches, has a failure section
- 70When it triggers. States when to use, but not when not to
- 100Steps. 10 steps
- 100Execution cost. Instruction body is 1128 tokens
Everything here is measured from the skill text rather than judged by a model, so the numbers are checkable. A parameter weighs more when it is a more common reason for the process to stall.
Quality signals
- +5Description has no quoted example phrases that should trigger the skill
- +4Description does not say when NOT to use the skill (false activations)
- +3Output format is not stated: the model decides each time
- +1No license
- +2Single-language instructions
- +3Description length 587: enough signal without eating the budget
- +4Structure: 7 headings
- +3Step-by-step instructions: 10 items
- +4Has examples (8 code blocks)
Quality base 70; lint remarks subtract, signals add up to 100. Result: 77.