Add connection pooling for MCP transporters

[Copilot]

Every connect() call was creating a new transporter instance, causing redundant HTTP client instantiation, session handshakes, and process spawning. This resulted in significant latency overhead for subsequent requests to the same server.

Changes

• TransporterPool (src/Core/TransporterPool.php): Maintains singleton registry of transporters keyed by server name. Provides get(), forget(), clear(), and getActiveServers() methods.

• MCPClient (src/MCPClient.php): Constructor now accepts TransporterPool instead of TransporterFactory. The connect() method passes server name to pool for lookup/creation.

• MCPClientServiceProvider (src/MCPClientServiceProvider.php): Registers TransporterPool as singleton to ensure all MCPClient instances share the same pool.

• Tests: Added integration tests for pool behavior. Updated existing MCPClient tests to mock pool instead of factory.

Usage

No code changes required. Subsequent connections automatically reuse transporters:

$client = app(MCPClient::class);

$client->connect('github')->tools();      // Creates transporter
$client->connect('github')->resources();  // Reuses transporter (50-80% faster)

// Force reconnection if needed
app(TransporterPool::class)->forget('github');

Impact

• 50-80% latency reduction for subsequent requests to same server
• Single HTTP client instance per server
• No repeated session handshakes
• No redundant process spawning for STDIO transporters

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

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If you need me to access, download, or install something from one of these locations, you can either:

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Feature]: Connection/Transporter Pooling and Reuse</issue_title>
<issue_description>### Summary

Priority: 🔴 HIGH
Impact: 50-80% reduction in latency for subsequent requests
Difficulty: Medium

Testing Checklist

• TransporterPool correctly stores and retrieves transporters
• Same transporter instance is returned for same server name
• forget() method removes specific transporter
• clear() method removes all transporters
• MCPClient uses TransporterPool instead of creating new instances
• All existing MCPClient tests still pass
• Multiple connects to same server reuse transporter

Expected Outcome

After implementing this:

• First connect() call: Creates new transporter (same as before)
• Subsequent connect() calls to same server: Reuses existing transporter (MUCH faster)
• Users can force reconnection with reconnect() method if needed

Problem

Currently, every time MCPClient::connect() is called, a new transporter instance is created. This means:

1. For HTTP transporters:

   • A new Guzzle HTTP client is instantiated
   • A new session initialization handshake occurs (extra network round-trip)
   • Memory overhead from multiple client instances

2. For STDIO transporters:

   • A new process is spawned every time
   • Process startup overhead (even with reduced delays)
   • Initialization handshakes are repeated unnecessarily

Example of Current Inefficiency

// User code that makes multiple requests
$client = app(MCPClient::class);

// First request - creates new transporter, initializes session
$client->connect('github')->tools();

// Second request - creates ANOTHER new transporter, initializes ANOTHER session
$client->connect('github')->resources();

// Third request - yet ANOTHER new transporter and session
$client->connect('github')->callTool('search', ['query' => 'test']);

Each of these creates a brand new transporter instance, even though they're connecting to the same server!

Proposed Solution

Create a TransporterPool class that maintains a singleton registry of active transporters and reuses them.

Implementation Steps

Step 1: Create TransporterPool Class

Create file: src/Core/TransporterPool.php

Step 2: Update MCPClient to Use TransporterPool

Modify src/MCPClient.php:

Step 3: Update Service Provider

Modify src/MCPClientServiceProvider.php:

public function packageBooted(): void
{
    // Register TransporterPool as singleton
    $this->app->singleton(TransporterPool::class, function ($app) {
        return new TransporterPool();
    });

    $this->app->bind(MCPClient::class, function ($app) {
        $servers = $app['config']->get('mcp-client.servers', []);

        return new MCPClient($servers, $app->make(TransporterPool::class));
    });
}

Step 4: Create Tests

Create file: tests/Core/TransporterPoolTest.php

• creates transporter on first call
• returns same transporter on subsequent calls
• forget removes transporter from pool
• clear removes all transporters
• getActiveServers returns list of server names

Step 5: Update Existing Tests

Update tests/MCPClient/MCPClientTest.php to use TransporterPool instead of TransporterFactory:

Replace all instances of:

$mockFactory = Mockery::mock(TransporterFactory::class);

With:

$mockPool = Mockery::mock(TransporterPool::class);

And update the expectations from shouldReceive('make') to shouldReceive('get').

Alternatives Considered

No response

Package Version

1

PHP Version

8.4

Laravel Version

12

Notes

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Feature]: Connection/Transporter Pooling and Reuse #22

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