Harness Router
A fast decision layer for smarter AI tool routing.
Harness Router launched on September 27, 2026 with 79 votes, #369 of 8,042 launches that month and more than 95% of that year's launches.
What it does
Harness Router is a decision layer for AI coding agents that improves tool selection before execution. Use it as a Codex hook for automatic routing on every tool call, or as a skill when you want explicit, agent-invoked decisions. It keeps obvious choices fast, uses Jev for ambiguity, and applies MCTS when multi-step consequences matter.
A decision layer for agent harnesses. Route tool calls automatically through Codex PreToolUse, use Jev for fast selection, and bounded MCTS when downstream consequences matter.
harness-router works two ways: use the skill to stop model reasoning about obvious tool calls, or let PreToolUse intercept and route calls automatically. Fast route handles ordinary choices; real ambiguity can escalate to Jev-backed MCTS. With the skill, Codex can delegate closed-choice tool selection to Harness Router instead of spending a full model reasoning step on an obvious choice. Prefer automatic enforcement? The PreToolUse hook applies the same routing layer before execution without requiring the model to invoke the skill explicitly. The hook validates the call against the discovered tool inventory before execution. Fast routing keeps deterministic transitions cheap while still…from harness-router.vercel.app
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