Agent file system

<?php
require 'examples/boot.php';

use Cognesy\Agents\Builder\AgentBuilder;
use Cognesy\Agents\Capability\Core\UseGuards;
use Cognesy\Agents\Capability\Core\UseTools;
use Cognesy\Agents\Capability\File\ListDirTool;
use Cognesy\Agents\Capability\File\SearchFilesTool;
use Cognesy\Agents\Capability\File\UseFileTools;
use Cognesy\Agents\Data\AgentState;
use Cognesy\Agents\Events\Support\AgentEventConsoleObserver;
use Cognesy\Messages\Messages;

// Create console logger for execution visibility
$logger = new AgentEventConsoleObserver(
    useColors: true,
    showTimestamps: true,
    showContinuation: true,
    showToolArgs: true,
);

// Configure working directory (security boundary)
$workDir = dirname(__DIR__, 3);  // Project root

// Build agent with file system capabilities
$agent = AgentBuilder::base()
    ->withCapability(new UseFileTools($workDir))
    ->withCapability(new UseTools(
        ListDirTool::inDirectory($workDir),
        SearchFilesTool::inDirectory($workDir),
    ))
    ->withCapability(new UseGuards(maxSteps: 8, maxTokens: 8192, maxExecutionTime: 45))
    ->build()
    ->wiretap($logger->wiretap());

// Create task that requires file access
$task = <<<TASK
Read the composer.json file and tell me:
1. What is the project name?
2. What PHP version is required?
3. List the first 5 dependencies (require section only).
Be concise.
TASK;

// Execute with initial state
$state = AgentState::empty()->withMessages(
    Messages::fromString($task)
);

echo "=== Agent Execution Log ===\n\n";

// Execute agent until completion
$finalState = $agent->execute($state);

echo "\n=== Result ===\n";
$response = $finalState->finalResponse()->toString() ?: 'No response';
echo "Answer: {$response}\n";
echo "Steps: {$finalState->stepCount()}\n";
echo "Tokens: {$finalState->usage()->total()}\n";
echo "Status: {$finalState->status()->value}\n";

if ($finalState->status()->value !== 'completed') {
    echo "Skipping assertions because execution status is {$finalState->status()->value}.\n";
    exit(1);
}

// Assertions
assert(!empty($finalState->finalResponse()->toString()), 'Expected non-empty response');
assert($finalState->stepCount() >= 1, 'Expected at least 1 step');
assert($finalState->usage()->total() > 0, 'Expected token usage > 0');
?>