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 RevenueCat/ai-toolkit --skill rc-securitygit clone --depth 1 https://github.com/RevenueCat/ai-toolkitWrote 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/revenuecat/ai-toolkit/rc-security)<a href="https://agentmods.dev/skills/revenuecat/ai-toolkit/rc-security"><img src="https://agentmods.dev/badge/skills/revenuecat/ai-toolkit/rc-security/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/revenuecat/ai-toolkit/rc-security"><img src="https://agentmods.dev/badge/skills/revenuecat/ai-toolkit/rc-security.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
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 | $0.00064 | $0.01528 |
| Opus 5.5 | $0.00026 | $0.00611 |
| Sonnet 5.5 | $0.00013 | $0.00306 |
| Haiku 4.5 | $0.00006 | $0.00153 |
Grade A, and why
rc-security 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 1mo 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 — 158 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Phase 0: Intent
Tell the user: "I will review your RevenueCat security posture on Android: verification mode, API keys, user identity, and server side access decisions."
Phase 1: Discovery
Confirm what RevenueCat already covers so you can focus on the real gaps.
| Concern | Who handles it | How |
|---|---|---|
| Receipt validation against Google Play | RevenueCat backend | Runs before awaitPurchase() returns |
| Purchase token reuse | RevenueCat backend | Tokens are deduplicated server side |
| Fabricated purchase tokens | RevenueCat backend | Fails Google Play verification, no entitlement granted |
| HTTPS transport to RevenueCat | SDK | Always on |
| Retry of token post on network failure | SDK | Retries on next app launch |
Ask the project these questions:
- Is
EntitlementVerificationModeset? If not,CustomerInforesponses are trusted without signature checking. - Is the SDK configured with the public Android key (starts with
goog_) or has someone accidentally pasted the secret key into the client? - Are real users identified with
Purchases.logIn(yourUserId), or is the app still relying on anonymous$RCAnonymousID:...? - Do server endpoints that serve premium content verify entitlement server side, or do they trust a client sent flag?
Phase 2: Plan
Decide each of the following before changing code.
Decision A: Entitlement verification mode
| Mode | Failed verification does what | Pick when |
|---|---|---|
DISABLED (default) |
No signing happens | Only for quick prototypes |
INFORMATIONAL |
Logged, access still granted | You want signal without risking false denials to real users |
ENFORCED |
EntitlementInfo.isActive returns false |
You accept some false negatives from proxies or VPNs in exchange for a strict client guarantee |
Decision B: Where is the authority?
Even with ENFORCED, the client is not the authority for paid content. Decide whether each premium endpoint:
- Calls the RevenueCat REST API per request, or
- Reads a local
has_entitlementflag driven by RevenueCat webhooks.
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.
- 1mo ago First seen · 158 lines · 64 tokens per session scan A cb70570da05e
rc-security is a skill published in the GitHub repository RevenueCat/ai-toolkit (76 stars, last pushed today), licensed MIT. It adds 64 tokens to every session and 1,528 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-08-30.
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