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 PollyGlot/google-play-cli-skills --skill gplay-signinggit clone --depth 1 https://github.com/PollyGlot/google-play-cli-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/pollyglot/google-play-cli-skills/gplay-signing)<a href="https://agentmods.dev/skills/pollyglot/google-play-cli-skills/gplay-signing"><img src="https://agentmods.dev/badge/skills/pollyglot/google-play-cli-skills/gplay-signing/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/pollyglot/google-play-cli-skills/gplay-signing"><img src="https://agentmods.dev/badge/skills/pollyglot/google-play-cli-skills/gplay-signing.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 | $0.00076 | $0.01050 |
| Opus 5 | $0.00038 | $0.00525 |
| Sonnet 5 | $0.00015 | $0.00210 |
| Haiku 4.5 | $0.00008 | $0.00105 |
Grade A, and why
gplay-signing 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 6d 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 — 80 lines — stays where its author put it; the contents beside it link to each section on GitHub.
gplay signing (self-hosted Play App Signing key)
Two experimental commands, signing enroll and signing rotate, both
irreversible and --confirm-gated. They drive the appsigning API for
apps whose signing key lives in the developer's own Google Cloud KMS
instance. Shared conventions (auth, --package pinning, output, exit codes,
--dry-run/--confirm) are in gplay-cli-usage.
The wall: this is not standard Play App Signing
The API only handles self-hosted KMS keys. Enrolling with a Google-generated or Google-managed key, and rotating such a key, cannot be done through the API: those are Play Console operations. When the user wants "Play App Signing" and has no Cloud KMS key, send them to the Console and stop here. Reach for this skill when key custody must stay external, which is a compliance, regulatory or policy requirement, never a convenience.
Prerequisite for both commands: an active Cloud KMS crypto key version whose IAM policy grants Google Play the Decrypt and Sign permissions (Google's guide).
Enroll
# an app that has already published to Open testing or Production
gplay signing enroll --kms-key projects/p/locations/l/keyRings/r/cryptoKeys/k/cryptoKeyVersions/1 --dry-run
gplay signing enroll --kms-key projects/p/locations/l/keyRings/r/cryptoKeys/k/cryptoKeyVersions/1 --confirm
# a brand-new app (never published to Open testing or Production)
gplay signing enroll --new-app --kms-key <resource> --kms-cert cert.pem --confirm
# register the CI upload certificate in the same call
gplay signing enroll --kms-key <resource> --upload-cert upload.pem --confirm
Two shapes, decided by the app's history. An app that has already shipped to
Open testing or Production passes only --kms-key. A new app passes
--new-app and must add --kms-cert, the PEM certificate of the KMS key
(--kms-cert is refused without --new-app). Certificates are always read
from PEM files: never paste base64 on a command line.
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.
- 6d ago First seen · 80 lines · 76 tokens per session scan A 3ef8bfca3ec9
gplay-signing is a skill published in the GitHub repository PollyGlot/google-play-cli-skills (5 stars, last pushed 7d ago), licensed MIT. It adds 76 tokens to every session and 1,050 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 2026-09-05.
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