Building a Meta-Agent System From Scratch in One Day

What if the agent routing your requests was itself an agent? Not a switch statement with an LLM wrapper. An actual agent that evaluates other agents, scores their capabilities, remembers what worked, and routes based on evidence. That's what oss-agent-lab shipped in a single day. Six phases. Nine specialists. A meta-agent that orchestrates the entire team. Here's how it came together. Phase 1: Specs Before Code Nine specification documents before a single line of application code. Base package structure, contracts, CLI skeleton, specialist template. This isn't ceremony. When you're building a multi-agent system, the contracts between agents are the architecture. Get them wrong and you refactor every specialist when the routing interface changes. Get them right and each phase stacks cleanly. Every agent implements the same contract: class BaseSpecialist ( ABC ): """ Contract every specialist must satisfy. """ @abstractmethod def capabilities ( self ) -> list [ Capability ]: """ Declare