amethyst/.claude/skills/amy-expert/references/command-template.md

Command-file template

Copy this shape for every new Amy verb. Resist the urge to deviate — the uniform shape is what makes commands easy to audit and test.

Single-verb command

package com.vitorpamplona.amethyst.cli.commands

import com.vitorpamplona.amethyst.cli.Args
import com.vitorpamplona.amethyst.cli.Context
import com.vitorpamplona.amethyst.cli.DataDir
import com.vitorpamplona.amethyst.cli.Json

object NotePublishCommand {
    suspend fun run(dataDir: DataDir, rest: Array<String>): Int {
        val args = Args(rest)
        val text = args.positional(0, "text")

        val ctx = Context.open(dataDir)
        try {
            ctx.prepare()

            val event = com.vitorpamplona.amethyst.commons.note
                .buildTextNote(ctx.signer, text)
            val ack = ctx.publish(event, ctx.outboxRelays())

            Json.writeLine(mapOf(
                "event_id"      to event.id,
                "kind"          to event.kind,
                "published_to"  to ack.filterValues { it }.keys.map { it.url },
                "rejected_by"   to ack.filterValues { !it }.keys.map { it.url },
            ))
            return 0
        } finally {
            ctx.close()
        }
    }
}

Multi-verb group

When a feature has several verbs (note publish, note show, note react), group them:

object NoteCommands {
    suspend fun dispatch(dataDir: DataDir, tail: Array<String>): Int {
        if (tail.isEmpty()) return Json.error("bad_args", "note <publish|show|react>")
        val rest = tail.drop(1).toTypedArray()
        return when (tail[0]) {
            "publish" -> NotePublishCommand.run(dataDir, rest)
            "show"    -> NoteShowCommand.run(dataDir, rest)
            "react"   -> NoteReactCommand.run(dataDir, rest)
            else      -> Json.error("bad_args", "note ${tail[0]}")
        }
    }
}

Each verb gets its own file. Once a single file crosses ~200 lines, split it — see GroupCommands.kt and its siblings as the reference.

Wire-up checklist

For every new command:

1. File under cli/commands/.
2. Branch in Commands.kt:

   suspend fun note(dataDir: DataDir, tail: Array<String>): Int =
       NoteCommands.dispatch(dataDir, tail)
   

3. Branch in Main.kt's top-level dispatch:

   "note" -> Commands.note(dataDir, tail)
   

4. Line in printUsage() explaining the verb.
5. Row in cli/README.md's command table.
6. Status flip in cli/ROADMAP.md (🆕 / 📦 → ✅).

What not to do

• No runBlocking in a command body — main() already does it.
• No println / print for command output — use Json.writeLine(...). System.err.println(...) is fine for progress logs (they're already disposable).
• No swallowing errors — let exceptions bubble; main() translates them to {"error":...} + exit code.
• No holding a connection open across invocations — every run opens a fresh Context and closes it in finally.
• No blocking reads for user input — take a flag.

Output-shape rules

See output-conventions.md.