[MCP Bundle] Long response from Tool

[molarro]

I use Symfony 7.4 and "symfony/mcp-bundle": "^0.6.0"

Using, MCP inspector or mcporter I get long response from tool, about 6-10 seconds.
Profiler shows that main problem is in controller.get_callable 6177.9 ms / 22 MiB.

Tool example:

<?php

namespace App\Mcp;

use Mcp\Capability\Attribute\McpTool;

class HelloTool
{
    #[McpTool(name: 'hello')]
    public function hello(string $name = 'World'): string
    {
        return "Hello $name from Symfony MCP!";
    }
}

Switching to prod env does not resolve the problem.

I have 4000+ services (php bin/console debug:container | wc -l), maybe bundle scan all services until find needed tool?

Symfony on Debian 13.3 (Docker)

[molarro]

Investigation show that problem is in ContainerControllerResolver::instantiateController:

protected function instantiateController(string $class): object
{
    $class = ltrim($class, '\\');

    if ($this->container->has($class)) {
        return $this->container->get($class);
    }

    try {
        return parent::instantiateController($class);
    } catch (\Error $e) {
    }

    $this->throwExceptionIfControllerWasRemoved($class, $e);

    if ($e instanceof \ArgumentCountError) {
        throw new \InvalidArgumentException(\sprintf('Controller "%s" has required constructor arguments and does not exist in the container. Did you forget to define the controller as a service?', $class), 0, $e);
    }

    throw new \InvalidArgumentException(\sprintf('Controller "%s" does neither exist as service nor as class.', $class), 0, $e);
}

It takes 6-10 seconds for

$this->container->get($class);

[chr-hertel]

Most likely caused by scanning a large code base, a quick fix is documented with #1660.

Related solution PR is #1730