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/play-billing-skills --skill subscription-state-diagramgit clone --depth 1 https://github.com/RevenueCat/play-billing-skillsWrote 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/play-billing-skills/subscription-state-diagram)<a href="https://agentmods.dev/skills/revenuecat/play-billing-skills/subscription-state-diagram"><img src="https://agentmods.dev/badge/skills/revenuecat/play-billing-skills/subscription-state-diagram/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/play-billing-skills/subscription-state-diagram"><img src="https://agentmods.dev/badge/skills/revenuecat/play-billing-skills/subscription-state-diagram.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00035 | $0.02084 |
| Opus 5 | $0.00017 | $0.01042 |
| Sonnet 5 | $0.00007 | $0.00417 |
| Haiku 4.5 | $0.00003 | $0.00208 |
Grade A, and why
subscription-state-diagram 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 12d 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 — 180 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Subscription State Diagram
Phase 0: Intent
Use this skill when you need a single place to look up:
- What states a Google Play subscription can be in.
- Which RTDN (Real Time Developer Notification) moves a subscription from one state to the next.
- Whether a given state grants access to paid content.
- What token behavior to expect across renewals, pauses, holds, and resubscribes.
This is a reference skill. It does not write code for you. It hands you the map so you can point at a node, point at an edge, and then make a decision about access or acknowledgement.
Phase 1: Locate
Tell the skill which part of the state machine you care about. Pick the shortest path that matches your question.
| You want to know... | Jump to |
|---|---|
| What every state means and whether it grants access | States at a Glance |
| Which RTDN fires on a specific transition | Transition Table |
| Whether to grant access right now | Access Decision Flowchart |
| What happens to the purchase token across events | Token Lifecycle |
| The numeric code for a notification type | RTDN Quick Reference |
| How long grace period, account hold, or token validity lasts | Time Windows |
A typical lookup looks like this:
- Name the current state (for example
IN_GRACE_PERIOD). - Name the event you observed (for example RTDN type 5).
- Find the row in the From
IN_GRACE_PERIODtable. - Read the target state and the access rule.
Phase 2: Reference Diagram
States at a Glance
| State | Access | Description |
|---|---|---|
| PENDING | No | Purchase initiated, payment not yet processed |
| ACTIVE | Yes | Subscription is paid and current |
| IN_GRACE_PERIOD | Yes | Payment failed, Google is retrying, user keeps access |
| ON_HOLD | No | Grace period expired, access revoked, awaiting payment fix |
| PAUSED | No | User requested pause, access revoked |
| CANCELED | Until expiry | Canceled but not expired, access until expiryTime |
| EXPIRED | No | Subscription has ended |
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.
- 12d ago First seen · 180 lines · 35 tokens per session scan A d85e33df8ba5
subscription-state-diagram is a skill published in the GitHub repository RevenueCat/play-billing-skills (53 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 35 tokens to every session and 2,084 once invoked, about $0.0002 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 2026-08-30.
Other skills, from other repositories
play-billing-library-version-upgrade
Use this skill when upgrading or migrating an Android project from any legacy Google Play Billing Library (PBL) version to the latest stable version of PBL.
asc-revenuecat-catalog-sync
Reconcile App Store Connect subscriptions and in-app purchases with RevenueCat products, entitlements, offerings, and packages using asc and RevenueCat MCP. Use when setting up or syncing subscription catalogs across ASC and RevenueCat.
axiom-implement-iap
Use when the user wants to add in-app purchases, implement StoreKit 2, or set up subscriptions.
google-play
Google Play Developer API (Android Publisher) integration with managed OAuth. Manage apps, subscriptions, in-app purchases, and reviews. Use this skill when users want to interact with Google Play Console programmatically. For other third party apps, use the api-gateway skill (https://clawhub.ai/byungkyu/api-gateway).
subscription-lifecycle
Generates StoreKit 2 subscription lifecycle management — grace periods, billing retry, offer codes, win-back offers, upgrade/downgrade paths, and subscription status monitoring. Use when user needs post-purchase subscription state handling beyond the initial paywall.
subscription-offers
Generates StoreKit 2 code for all subscription offer types — introductory, promotional, offer codes, and win-back. Includes eligibility checks, offer presentation, and the preferredSubscriptionOffer modifier. Use when adding subscription offers, free trials, or promotional pricing.