---
type: "post"
stable_id: "post:luna-worker-model-routing"
slug: "luna-worker-model-routing"
title: "Luna Worker Routing Needs A Written Contract"
description: "A custom worker model can save expensive parent-agent context only when delegation has an explicit task contract, budget, stop rule, and verification receipt."
retrieval_nugget: "A custom worker model can save expensive parent-agent context only when delegation has an explicit task contract, budget, stop rule, and verification receipt. The Luna-worker signal points at a pattern that matters more than the exact model name: delegate bounded work to a cheaper or specialized worker only when the parent agent can encode the contract."
status: "published"
published_at: "2026-08-04"
updated_at: "2026-08-04"
record_date: "2026-08-04"
date_kind: "published_at"
topics: ["codex","model-routing","coding-agents","operations"]
source_urls: ["https://x.com/Voxyz_ai/status/2083545774768402673"]
visuals: [{"id":"luna-worker-model-routing","kind":"editorial-diagram","role":"hero","src":"/images/drip/luna-worker-model-routing/luna-worker-model-routing.webp","alt":"Hand-drawn delegation diagram where a parent agent splits work, a router checks model choice, budget, and stop condition, and a worker returns patch and receipt to verification.","caption":"New Runtime synthesis: delegated workers help only when the boundary is encoded before the task starts.","credit":"New Runtime synthesis from public source material","source_url":"https://x.com/Voxyz_ai/status/2083545774768402673","generated_with":"gemini-3.1-flash-image","width":1600,"height":900,"legend":[{"label":"Parent","description":"The expensive agent breaks work into bounded packets."},{"label":"Router","description":"Model choice, cost budget, and stop condition are checked before delegation."},{"label":"Verify","description":"The worker returns a patch and receipt, not an unbounded claim of completion."}]}]
schema_version: "newruntime-agent-readable-v0.2"
routes: {"html":"https://newruntime.com/posts/luna-worker-model-routing/","markdown":"https://newruntime.com/posts/luna-worker-model-routing.md","json":"https://newruntime.com/posts/luna-worker-model-routing.json"}
---

# Luna Worker Routing Needs A Written Contract

## Retrieval answer

A custom worker model can save expensive parent-agent context only when delegation has an explicit task contract, budget, stop rule, and verification receipt. The Luna-worker signal points at a pattern that matters more than the exact model name: delegate bounded work to a cheaper or specialized worker only when the parent agent can encode the contract.

The Luna-worker signal points at a pattern that matters more than the exact model name: delegate bounded work to a cheaper or specialized worker only when the parent agent can encode the contract.

Without that contract, model routing is just a config trick. The worker needs a task boundary, budget, stop condition, allowed files, expected artifact, and verification rule. The parent needs a receipt that can be checked before the result becomes part of the main context.

The syntax still needs to be verified against the current Codex surface before anyone treats it as a durable setup. But the operating idea is stable: save expensive model context by moving narrow work into worker lanes with explicit acceptance checks.

For New Runtime, this belongs next to the drip publisher and OpenClaw boundary. Delegation should be cheaper, but it also has to be accountable: what was assigned, what came back, which check passed, and when the parent agent should refuse the result.