Does amethyst auto-invoke its skills?

Not yet. It is indexed on Flowy as a plain plugin. Request auto-invocation on its page and Flowy will route its skills for you as you prompt.

Yes. Flowy is free and open source, with nothing gated. You can read every skill in full before you install.

Development

Plugin

amethyst

Nostr client for Android

Boost this plugin

vitorpamplona@vitorpamplona

GitHub

Plugin Signal87/100Strong

maintained100

capable74

documented100

adopted68

Install

$ npx -y skills add vitorpamplona/amethyst --agent claude-code

Stats

Bash Java Kotlin SQLite Linux

+5 tags

Git GitHub Markdown iOS Android

1,601

Stars

220

Forks

Active

Maintenance

Kotlin

Language

MIT

License

2m ago

Last commit

3y ago

Created

Repo: vitorpamplona/amethyst

What's inside

Amethyst

Nostr Client for Android

Join the social network you control.

Download and Install

Android

Desktop

OS	CLI install	Direct download
macOS (Apple Silicon)	`brew install --cask amethyst-nostr`	.dmg arm64
macOS (Intel)	`brew install --cask amethyst-nostr`	.dmg x64
Windows 10/11	`winget install VitorPamplona.Amethyst`	.msi · .zip portable
Debian/Ubuntu	—	.deb
Fedora/RHEL/openSUSE	—	.rpm
Any Linux	—	AppImage · .tar.gz

Coming soon (separate PR): Scoop (Windows), AUR (Arch Linux).

Build from source: see BUILDING.md.

Install troubleshooting (Gatekeeper / SmartScreen / AppImage): see BUILDING.md § Troubleshooting installs.

Verifying the APK signature

If you sideload Amethyst (Obtainium, GitHub Releases, Zap Store), verify that your APK is signed by the official release key before installing. All official Amethyst APKs — both the googleplay and fdroid flavors — are signed with the same certificate, whose SHA-256 fingerprint is:

C2:D0:AA:86:BC:B6:B6:20:90:56:1A:41:BB:E3:36:E9:8B:78:C2:D0:21:0A:49:8D:C8:85:F2:8E:13:48:CF:17

To check a downloaded APK yourself, run (apksigner ships with the Android SDK build-tools):

apksigner verify --print-certs amethyst-*.apk

and confirm the reported Signer #1 certificate SHA-256 digest is c2d0aa86bcb6b62090561a41bbe336e98b78c2d0210a498dc885f28e1348cf17. Without the Android SDK, keytool -printcert -jarfile amethyst-*.apk (bundled with any JDK) prints the same SHA-256 fingerprint.

With AppVerifier, paste or share the APK and compare against:

com.vitorpamplona.amethyst
C2:D0:AA:86:BC:B6:B6:20:90:56:1A:41:BB:E3:36:E9:8B:78:C2:D0:21:0A:49:8D:C8:85:F2:8E:13:48:CF:17

Supported Features

Privacy and Information Permanence

Relays know your IP address, your name, your location (guessed from IP), your pub key, all your contacts, and other relays, and can read every action you do (post, like, boost, quote, report, etc) except for Private Zaps and Private DMs. While the content of direct messages (DMs) is only visible to you and your DM counterparty, everyone can see when you and your counterparty DM each other.

If you want to improve your privacy, consider utilizing a service that masks your IP address (e.g. a VPN or Tor) from trackers online.

The relay also learns which public keys you are requesting, meaning your public key will be tied to your IP address.

Information shared on Nostr can be re-broadcasted to other servers and should be assumed permanent for privacy purposes. There is no way to guarantee the deletion of any content once posted.

Development Overview

This repository is split between Amethyst, Quartz, Commons, and DesktopApp:

Amethyst - Native Android app with Kotlin and Jetpack Compose
Quartz - Nostr-commons KMP library for protocol classes shared across platforms
Commons - Kotlin Multiplatform module with shared UI components (icons, robohash, blurhash, composables)
DesktopApp - Compose Multiplatform Desktop application reusing commons and quartz

The app architecture consists of the UI, which uses the usual State/ViewModel/Composition, the service layer that connects with Nostr relays, and the model/repository layer, which keeps all Nostr objects in memory, in a full OO graph.

The repository layer stores Nostr Events as Notes and Users separately. Those classes use LiveData and Flow objects to allow the UI and other parts of the app to subscribe to each Note/User and receive updates when they happen. They are also responsible for updating viewModels when needed. As the user scrolls through Events, the Datasource classes are updated to receive more information about those particular Events.

Most of the UI is reactive to changes in the repository classes. The service layer assembles Nostr filters for each need of the app, receives the data from the Relay, and sends it to the repository. Connection with relays is never closed during the use of the app. The UI receives a notification that objects have been updated. Instances of User and Notes are mutable directly. There will never be two Notes with the same ID or two User instances with the same pubkey.

Lastly, the user's account information (private key/pub key) is stored in the Android KeyStore for security.

Setup

Make sure to have the following pre-requisites installed:

Java 21+
Android Studio
Android 8.0+ Phone or Emulation setup

Fork and clone this repository and import it into Android Studio

git clone https://github.com/vitorpamplona/amethyst.git

Use an Android Studio build action to install and run the app on your device or a simulator.

Building

Build the Android app:

./gradlew assembleDebug

Build and run the Desktop app (requires Java 21+):

./gradlew :desktopApp:run

Full build (including tests)

./gradlew build

Requirements:

File tree

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FAQ

amethyst is a Claude Code plugin with 30 hand-picked skills for development work, indexed on Flowy. Install it with the command on its page. It includes account-state, amy-expert, android-expert. Its skills do not fire on their own yet. Request auto-invocation to have Flowy route them as you prompt. Free and open source.

What is amethyst?: Nostr client for Android
How do I install amethyst?: Run these in Claude Code: npx -y skills add vitorpamplona/amethyst --agent claude-code. Then prompt normally.
Does amethyst auto-invoke its skills?: Not yet. It is indexed on Flowy as a plain plugin. Request auto-invocation on its page and Flowy will route its skills for you as you prompt.
Is amethyst free?: Yes. Flowy is free and open source, with nothing gated. You can read every skill in full before you install.

Is this plugin yours?

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