# Check Signature

> Verify Android APK signing certificates and compare signer fingerprints with apksigner

- **Type:** Skill
- **Install:** `agentstack add skill-jason0404-jason-android-marketplace-check-signature`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [jason0404](https://agentstack.voostack.com/s/jason0404)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [jason0404](https://github.com/jason0404)
- **Source:** https://github.com/jason0404/Jason-Android-Marketplace/tree/main/plugins/android-artifact-inspector/skills/check-signature

## Install

```sh
agentstack add skill-jason0404-jason-android-marketplace-check-signature
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

Verify signing for one or more `.apk` files.

## Workflow
1. Confirm supplied files exist and are APKs.
2. Locate `apksigner` cross-platform through PATH or Android SDK build-tools locations.
3. Invoke `android-apk-signing-verifier`.
4. Use `apksigner verify --print-certs` when available.
5. Report verification status, signer count and certificate SHA-256 digest where returned.
6. When comparing APKs, state whether the confirmed certificate fingerprints match.
7. Generate an HTML report only when requested.

## Safety
Never request or expose keystore passwords or private signing material. Do not claim which Play Console key a certificate represents unless that evidence was separately provided.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [jason0404](https://github.com/jason0404)
- **Source:** [jason0404/Jason-Android-Marketplace](https://github.com/jason0404/Jason-Android-Marketplace)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-jason0404-jason-android-marketplace-check-signature
- Seller: https://agentstack.voostack.com/s/jason0404
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.