maestro-extension

name

maestro-extension

description

Help developers create and implement extensions for the Maestro CLI application. Use this skill whenever the user mentions creating a Maestro extension, adding custom tools or commands, building UI components for Maestro, registering memory files or event handlers, packaging a Composer package with Maestro extensions, or setting up auto-discovery in composer.json. Also trigger when users ask about the ExtensionInterface, ExtensionApi, InlineCommand, ToolInterface, ThemeInterface, WidgetInterface, or any Maestro extension-related classes and concepts.

Maestro Extension Development Guide

This skill helps you create and implement extensions for the Maestro CLI application. Maestro extensions allow you to customize the AI agent by adding custom tools, commands, renderers, UI components, and event handlers.

Core Concepts

A Maestro extension is a PHP class that implements ExtensionInterface. The extension registers its capabilities through the ExtensionApi object in the register() method.

Extension Structure

namespace MyVendor\MyExtension;

use NeuronCore\Maestro\Extension\ExtensionInterface;
use NeuronCore\Maestro\Extension\ExtensionApi;

class MyExtension implements ExtensionInterface
{
    public function name(): string
    {
        return 'my-extension';
    }

    public function register(ExtensionApi $api): void
    {
        // Register tools, commands, renderers, events, etc.
    }
}

---

Reading Documentation

When working on an extension, you may need to reference the full documentation:

• Core extension docs: src/Extension/README.md
• UI system docs: src/Extension/UI/README.md

Read these files when you need detailed information about specific APIs, advanced patterns, or complete reference material.

---

Creating a New Extension

1. Create a PHP class implementing ExtensionInterface
2. Return a unique extension name via name() method
3. Implement register(ExtensionApi $api) to add functionality
4. Add the extension to .maestro/settings.json for manual registration, or use auto-discovery

ExtensionApi Methods

Method	Purpose
registerTool(ToolInterface $tool)	Register an AI tool the agent can use
registerCommand(InlineCommand $command)	Register an inline command (e.g., /status)
registerRenderer(string $toolName, ToolRenderer $renderer)	Register a custom tool output renderer
registerMemory(string $key, string $filePath)	Register a memory file for agent context
registerWidget(WidgetInterface $widget)	Register a UI widget
on(string $event, callable $handler)	Register an event callback
ui()	Get the UiBuilder for UI customization
tools(), commands(), renderers(), events(), memories()	Get registries for advanced registration

---

Registering AI Tools

Tools are AI-accessible functions that extend what the agent can do. Use the ToolInterface from NeuronAI.

use NeuronAI\Tools\ToolInterface;

class MyTool implements ToolInterface
{
    public function name(): string
    {
        return 'my_tool';
    }

    public function description(): string
    {
        return 'Description of what the tool does';
    }

    public function parameters(): array
    {
        return [
            'param1' => ['type' => 'string', 'description' => 'First parameter'],
            'param2' => ['type' => 'integer', 'description' => 'Second parameter'],
        ];
    }

    public function execute(array $args): string
    {
        // Tool logic here
        return 'Result';
    }
}

// Register in extension:
$api->registerTool(new MyTool());

---

Creating Inline Commands

Inline commands are available in the interactive console with a / prefix.

use NeuronCore\Maestro\Console\Inline\InlineCommand;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class MyCommand implements InlineCommand
{
    public function getName(): string
    {
        return 'my-command';
    }

    public function getDescription(): string
    {
        return 'My custom command description';
    }

    public function execute(string $args, InputInterface $input, OutputInterface $output): void
    {
        $output->writeln('Hello from my command!');
    }
}

// Register in extension:
$api->registerCommand(new MyCommand());

---

UI Customization

Use $api->ui() to access the UiBuilder for customizing the terminal interface.

Slots (Layout Regions)

Slots are named regions of terminal output. The four built-in slots are:

Slot	Position	Line Ending
HEADER	Before content	Followed by blank line
CONTENT	Main response area	Normal newline per item
STATUS_BAR	After content	No trailing newline
FOOTER	After status bar	Preceded by blank line

use NeuronCore\Maestro\Extension\Ui\SlotType;

// Add content to a slot (higher priority renders first)
$api->ui()->addToSlot(SlotType::HEADER, 'Project: my-app', priority: 900);
$api->ui()->addToSlot(SlotType::STATUS_BAR, ' ⎇ main ', priority: 700);
$api->ui()->addToSlot(SlotType::FOOTER, 'Tip: type /help', priority: 100);

// Clear all items in a slot (affects all extensions)
$api->ui()->clearSlot(SlotType::HEADER);

Multiple extensions can add to the same slot — items are appended and sorted by priority. Use high priority (e.g., 900) for top position, low priority (e.g., 100) for bottom.

Themes

A theme defines colors, styles, and icons. Replaces the active theme globally.

use NeuronCore\Maestro\Extension\Ui\ThemeInterface;
use NeuronCore\Maestro\Extension\Ui\ColorName;
use NeuronCore\Maestro\Extension\Ui\StyleName;
use NeuronCore\Maestro\Extension\Ui\IconName;

class MyTheme implements ThemeInterface
{
    public function name(): string
    {
        return 'my-theme';
    }

    public function color(ColorName $color): string
    {
        return match ($color) {
            ColorName::PRIMARY => 'blue',
            ColorName::SUCCESS => 'green',
            ColorName::WARNING => 'yellow',
            ColorName::ERROR   => 'red',
            ColorName::INFO    => 'cyan',
            ColorName::MUTED   => 'gray',
            ColorName::ACCENT  => 'magenta',
        };
    }

    public function style(StyleName $style): string
    {
        return match ($style) {
            StyleName::BOLD      => 'options=bold',
            StyleName::DIM       => 'options=dim',
            StyleName::UNDERLINE => 'options=underscore',
            StyleName::DEFAULT   => '',
        };
    }

    public function icon(IconName $icon): string
    {
        return match ($icon) {
            IconName::SUCCESS     => '✔',
            IconName::ERROR       => '✘',
            IconName::WARNING     => '▲',
            IconName::INFO        => '●',
            IconName::SPINNER     => '◌',
            IconName::ARROW_RIGHT => '→',
            IconName::ARROW_DOWN  => '↓',
            IconName::DOT         => '·',
        };
    }
}

// Register in extension (replaces current theme globally):
$api->ui()->registerTheme(new MyTheme());

Widgets

Widgets are reusable components that render structured data. They must be invoked by rendering code — registering a widget makes it available, it doesn't auto-render.

use NeuronCore\Maestro\Extension\Ui\WidgetInterface;
use NeuronCore\Maestro\Extension\Ui\ContentType;
use NeuronCore\Maestro\Extension\Ui\UiBuilder;

class MyWidget implements WidgetInterface
{
    public function name(): string
    {
        return 'my_widget';
    }

    public function contentType(): ContentType
    {
        return ContentType::STATUS;
    }

    public function render(array $data, UiBuilder $ui): string
    {
        $icon = $ui->theme()->icon(IconName::SUCCESS);
        return $ui->formatText("{$icon} My widget output", ColorName::SUCCESS);
    }
}

// Register in extension:
$api->registerWidget(new MyWidget());

Note: Widget names must be unique. Registering with an existing name replaces the previous widget. To extend rather than replace, use a unique name.

Formatting Text

Use formatText() to apply colors and styles using the active theme:

use NeuronCore\Maestro\Extension\Ui\ColorName;
use NeuronCore\Maestro\Extension\Ui\StyleName;
use NeuronCore\Maestro\Extension\Ui\IconName;

// Color only
$line = $api->ui()->formatText('text', ColorName::PRIMARY);

// Style only
$line = $api->ui()->formatText('text', style: StyleName::BOLD);

// Color + style
$line = $api->ui()->formatText('text', ColorName::PRIMARY, StyleName::BOLD);

// With theme icon
$icon = $api->ui()->theme()->icon(IconName::SUCCESS);
$line = $api->ui()->formatText("{$icon} Done", ColorName::SUCCESS);

---

Memory Files

Memory files are automatically loaded and injected into the agent's system prompt, providing project-specific context.

// Register a memory file bundled with your extension
$api->registerMemory('my-extension.guidelines', __DIR__ . '/memory/guidelines.md');

Requirements:

• File must exist and be readable
• Use absolute paths (__DIR__ for files within your extension)
• Content must be Markdown

Memory files are presented to the agent with the key you provided (e.g., ### my-extension.guidelines).

---

Event Handling

Extensions can react to application events:

use NeuronCore\Maestro\Events\AgentThinkingEvent;
use NeuronCore\Maestro\Events\AgentResponseEvent;
use NeuronCore\Maestro\Events\ToolApprovalRequestedEvent;

// Before AI thinks
$api->on(AgentThinkingEvent::class, function ($event, $context) {
    // Access event properties
});

// After AI responds
$api->on(AgentResponseEvent::class, function ($event, $context) {
    // Handle response
});

// When tool approval is requested
$api->on(ToolApprovalRequestedEvent::class, function ($event, $context) {
    // Handle approval request
});

---

Configuration Handling

Extensions can accept configuration from .maestro/settings.json:

{
    "extensions": [
        {
            "class": "MyVendor\\MyExtension\\MyExtension",
            "enabled": true,
            "config": {
                "api_key": "your-api-key",
                "option": "value"
            }
        }
    ]
}

class MyExtension implements ExtensionInterface
{
    private array $config;

    public function __construct(array $config = [])
    {
        $this->config = $config;
    }

    public function register(ExtensionApi $api): void
    {
        $apiKey = $this->config['api_key'] ?? null;
        $option = $this->config['option'] ?? 'default';
        // Use config values
    }
}

---

Packaging as Composer Package

Create a composer.json for your extension:

{
    "name": "my-vendor/my-extension",
    "type": "library",
    "description": "My Maestro extension",
    "require": {
        "neuron-core/maestro": "^1.0"
    },
    "autoload": {
        "psr-4": {
            "MyVendor\\MyExtension\\": "src/"
        }
    }
}

Auto-Discovery Setup

Add the extra.maestro field to enable automatic extension discovery:

{
    "name": "my-vendor/my-extension",
    "type": "library",
    "require": {
        "neuron-core/maestro": "^1.0"
    },
    "extra": {
        "maestro": {
            "extensions": [
                "MyVendor\\MyExtension\\MyExtension"
            ]
        }
    },
    "autoload": {
        "psr-4": {
            "MyVendor\\MyExtension\\": "src/"
        }
    }
}

A single package can declare multiple extensions:

{
    "extra": {
        "maestro": {
            "extensions": [
                "MyVendor\\Package\\CoreExtension",
                "MyVendor\\Package\\AdminExtension",
                "MyVendor\\Package\\ReportingExtension"
            ]
        }
    }
}