How I Build Multi-Agent Systems: Routing via Bindings

Fazm Team··2 min read

How I Build Multi-Agent Systems: Routing via Bindings

The most common mistake in multi-agent systems is giving every agent access to every tool. You end up with generalist agents that do everything poorly instead of specialist agents that do one thing well.

The fix is routing via bindings: each agent only sees the tools it needs.

What Bindings Look Like

A binding is the set of tools and context an agent has access to. Your research agent gets web search, file reading, and note-taking tools. Your coding agent gets file editing, terminal access, and test runners. Your deployment agent gets CI/CD tools and environment management.

No agent sees another agent's tools. The research agent cannot edit code. The coding agent cannot deploy. This constraint is the feature.

Why Constraints Help

When an agent has access to everything, it makes bad decisions about which tool to use. Give a coding agent deployment tools and it will sometimes try to deploy untested code. Give a research agent file editing and it will sometimes modify files when it should just be reading them.

Narrow bindings force each agent to stay in its lane. When an agent hits the boundary of its capabilities, it returns its result to the orchestrator, which routes the work to the appropriate specialist.

The Orchestrator Pattern

The orchestrator agent is the only one that sees the full picture. It receives a task, decides which specialist to invoke, passes the relevant context, collects the result, and decides the next step. It has routing tools but no execution tools.

This pattern scales cleanly. Adding a new capability means adding a new specialist agent with its own bindings. The existing agents do not change. The orchestrator learns one new routing option.

Keep your agents focused and your routing explicit.

Fazm is an open source macOS AI agent. Open source on GitHub.

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