Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add cenconq25/claude-code-app-studio --skill balance-checkgit clone --depth 1 https://github.com/cenconq25/claude-code-app-studioWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/cenconq25/claude-code-app-studio/balance-check)<a href="https://agentmods.dev/skills/cenconq25/claude-code-app-studio/balance-check"><img src="https://agentmods.dev/badge/skills/cenconq25/claude-code-app-studio/balance-check.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00052 | $0.01590 |
| Opus 5 | $0.00026 | $0.00795 |
| Sonnet 5 | $0.00010 | $0.00318 |
| Haiku 4.5 | $0.00005 | $0.00159 |
Grade A, and why
balance-check scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 223 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Balance Check
Pricing and growth experiments are the app's economic balance. This skill reads the configuration, applies sanity checks (outliers, illogical funnels, dominant variants, missing fallbacks), and flags issues before they ship to production.
Phase 1: Locate Config
Read in parallel:
- Pricing config files — typical paths:
assets/data/pricing.json,src/config/pricing.ts,lib/config/pricing.dart,Resources/pricing.plist,res/raw/pricing.xml. - Paywall variant config —
assets/paywalls/*.json,src/config/paywalls/*. - Feature flags — local defaults file, plus the cloud provider
reference (Firebase Remote Config, LaunchDarkly, ConfigCat,
Statsig). The cloud values may live in
production/configs/. - Experiment definitions —
production/experiments/*.mdor whatever the project uses. - The PRDs that govern monetization —
design/prd/monetization.prd.md,design/prd/paywall.prd.md.
If nothing is found, ask the user to point at the relevant file or folder.
Phase 2: Pricing Sanity
For each pricing tier configuration, check:
- Currency is set per supported region.
- Each price has a fallback for App Store / Play Store SKU.
- Annual prices are at most 12x monthly; if higher, surface as a bug (probably an inverted unit). If lower than 8x monthly, the annual is essentially "always buy annual" — flag dominance.
- Trial duration is reasonable (1-30 days). 0-day trials should be removed unless intentional.
- Discount percentages match parent vs current price arithmetic
(no
was $9.99 / now $14.99type errors). - Each tier maps to a defined SKU on both App Store Connect and Play Console (cross-reference the SKU IDs).
- No tier is reachable only through deprecated paths (paywall variant the app no longer renders).
- Localized prices are not silently in USD — confirm
priceLocalehandling.
Phase 3: Paywall Variant Audit
If multiple paywall variants exist, build a comparison table:
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 4d ago First seen · 223 lines · 52 tokens per session scan A a1a5e578c357
balance-check is a skill published in the GitHub repository cenconq25/claude-code-app-studio (40 stars, last pushed 4mo ago), licensed MIT. It adds 52 tokens to every session and 1,590 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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