Harness Router Adds Jev-Powered Tool Routing

Harness Router targets a real weakness in tool-heavy agents: expensive models wasting reasoning on straightforward tool selection. Its architecture is promising, but the early benchmarks remain exploratory rather than proof of better end-to-end agent performance.

• –Codex and Claude Code hooks can intercept every pending tool call, allow good choices, and request replanning when a confident alternative exists.
• –Jev handles ordinary routing while MCTS explores downstream consequences locally without multiplying model calls.
• –Fail-open behavior and separate execution policies preserve sandboxing and authorization boundaries.
• –An exploratory 24-case benchmark reported 404.5 ms average router latency versus 3,842.1 ms for Codex selection, with identical choices in all cases.
• –The alpha project still needs held-out tests on genuinely ambiguous tool sets and full task completion, cost, and reliability metrics.