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 pbl-v7-to-v9-migrationgit 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/pbl-v7-to-v9-migration)<a href="https://agentmods.dev/skills/revenuecat/play-billing-skills/pbl-v7-to-v9-migration"><img src="https://agentmods.dev/badge/skills/revenuecat/play-billing-skills/pbl-v7-to-v9-migration/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/pbl-v7-to-v9-migration"><img src="https://agentmods.dev/badge/skills/revenuecat/play-billing-skills/pbl-v7-to-v9-migration.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 | $0.00079 | $0.02490 |
| Opus 5 | $0.00039 | $0.01245 |
| Sonnet 5 | $0.00016 | $0.00498 |
| Haiku 4.5 | $0.00008 | $0.00249 |
Grade A, and why
pbl-v7-to-v9-migration 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 — 153 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Phase 0: Intent
Announce to the user: "I will migrate this project from PBL 7 to PBL 9 in two stages."
State the structure clearly. There is no direct v7 to v9 shortcut. Almost all of the breaking work belongs to v8.0.0 (the Sku* removals, the proration to replacement mode rename, alternative billing renames, the pending purchases params, the queryProductDetailsAsync result shape). v9 itself removed nothing and only adds a target SDK bump plus three small adjustments. So this migration is:
- Stage A — v7 to v8: the heavy, mechanical rename work.
- Stage B — v8 to v9: the small delta.
This skill is self contained, but each stage links to the dedicated single hop skill if you want the long form: pbl-v7-to-v8-migration and pbl-v8-to-v9-migration.
Urgency: PBL 7 stops accepting new app and update submissions on August 31, 2026. After that date you cannot ship any release (including security fixes) built on v7, so plan to be in production on v9 with margin for monitoring.
Phase 1: Discovery
- Locate the dependency. Find
com.android.billingclient:billinginbuild.gradle(.kts)orlibs.versions.toml. Confirm it reads7.x(or5.x/6.xcompiling against v7 APIs — the same steps apply). - Scan for every v7 era identifier. Grep the repo for each item in the Stage A rename map below. Record every hit; each is an edit site.
- Check SDK levels. Read
minSdk,compileSdk,targetSdk. You will moveminSdkto 23 andtargetSdkto 35 across the migration. - Check androidx.core. Record the version; Stage B needs 1.9+.
- Note alternative billing and developer provided billing usage. Grep for
enableAlternativeBilling,AlternativeBillingListener,AlternativeChoiceDetails, andDeveloperProvidedBillingDetails.
Report back: "You are on PBL [current]. I found [N] v7 call sites across [M] files. Planning a two stage migration: v7 to v8, then v8 to v9.0.0."
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 · 153 lines · 79 tokens per session scan A 92732233c532
pbl-v7-to-v9-migration is a skill published in the GitHub repository RevenueCat/play-billing-skills (53 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 79 tokens to every session and 2,490 once invoked, about $0.0004 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.
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