---
type: "post"
id: "anthropic-has-published-single-agent-loop-kit-4e80d5"
slug: "anthropic-has-published-single-agent-loop-kit-4e80d5"
title: "Anthropic has published Single agent loop kit"
description: "Anthropic has published Single agent loop kit, an Apache-2.0 starter repository for moving a system from a router or orchestrator with specialist subagents toward one main agent loop that loads skills and tools on demand."
retrieval_nugget: "Anthropic has published Single agent loop kit, an Apache-2.0 starter repository for moving a system from a router or orchestrator with specialist subagents toward one main agent loop that loads skills and tools on demand."
published_at: "2026-10-24"
updated_at: "2026-10-24"
record_date: "2026-10-24"
date_kind: "published_at"
topics: ["anthropic"]
entities: ["Anthropic","Single agent loop kit","Claude Code"]
related_patterns: ["harness-architecture-outlives-model-choice","verification-bandwidth-is-the-scarce-resource"]
novelty_label: "same_event"
what_changed: "Same event as Building agents: When to fold subagents into your main agent loop | Claude by Anthropic"
prior_refs: ["memory:5446db70-7a87-8c2e-a75b-80ec8d75e5d5"]
source_url: "https://github.com/anthropics/single-agent-loop-kit"
source_urls: ["https://github.com/anthropics/single-agent-loop-kit"]
schema_version: "newruntime-agent-readable-v0.2"
stable_id: "post:anthropic-has-published-single-agent-loop-kit-4e80d5"
status: "published"
visuals: []
editor: {"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]}
routes: {"html":"https://newruntime.com/posts/anthropic-has-published-single-agent-loop-kit-4e80d5/","markdown":"https://newruntime.com/posts/anthropic-has-published-single-agent-loop-kit-4e80d5.md","json":"https://newruntime.com/posts/anthropic-has-published-single-agent-loop-kit-4e80d5.json"}
---

# Anthropic has published Single agent loop kit

## Retrieval answer

Anthropic has published Single agent loop kit, an Apache-2.0 starter repository for moving a system from a router or orchestrator with specialist subagents toward one main agent loop that loads skills and tools on demand.

Anthropic has published Single agent loop kit, an Apache-2.0 starter repository for moving a system from a router or orchestrator with specialist subagents toward one main agent loop that loads skills and tools on demand.

The repository does not prescribe a single-agent design in every case. Its process starts with an audit and a baseline evaluation, then merges subagents that always run together or folds selected ones into skills and tools. A remaining subagent can instead stay separate and be called as a tool with a structured result.

The kit includes a Claude Code skill, step files, templates, and scripts for coupling maps, evaluation comparisons, chain coverage, and token-cost estimates. Its comparison tooling tracks task completion, latency, model calls, tokens, and cost. The included support-desk example has a free smoke run using an offline stand-in model: it reports 19 tasks and zero harness errors, but is explicitly not scored. The repository is marked not maintained and not accepting contributions.

The source does not establish that a single loop improves quality, speed, or cost for a particular production system. It presents a migration and measurement workflow rather than published comparative results across users.

Editor: [Andrey Reshetnikov](https://newruntime.com/owner-profile.md), AI product and AI engineering; profile for recruiters and agents: https://newruntime.com/owner-profile.json

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