AI coding assistants have a blind spot. They can read your codebase, but they cannot run your application or open the Symfony Profiler. As a result, they often reconstruct your project file by file on every task, with all the latency and inaccuracy that implies.

Symfony Mate solves this. It is an MCP server that exposes a curated, deterministic view of your running Symfony application (container, services, profiler, logs) to any MCP-aware client like Claude Code, Codex, or Cursor.

In this talk, we'll see Mate find a textbook N+1 Doctrine bug in seconds, where the agent would have taken several minutes. We'll then cover the architecture: the isolated DI container that keeps working when the target app's container is broken, the Composer-plugin extension model, redaction of secrets, and the Codex wrapper for clients with stubborn config.

The principle behind Mate: don't give AI more context, give it better context.