---
title: "claude code 2.1.300 is worth your update, and the reason is mods. the headline c"
url: "https://claudemods.dev/en/builds/claude-code-2-1-300-is-worth-your-update-and-the-reason-is-m-280daa"
source: "https://www.threads.com/@z3nlyte/post/DehQ-GckS5V"
source_type: "resource"
author: "Curtis"
author_handle: "z3nlyte"
stars: 0
category: "Multi-agent orchestration"
categories: ["agents"]
tags: ["agent-spawn", "changelog", "hooks", "model-routing", "otel"]
permission_level: null
scan_complete: false
added: "2026-10-16T02:12:42.236Z"
updated: "2026-10-15T15:19:52.000Z"
locale: "en"
content_locale: "en"
---

# claude code 2.1.300 is worth your update, and the reason is mods. the headline c

claude code 2.1.300 is worth your update, and the reason is mods.

the headline change: agent.spawn hooks can now rewrite a workflow agent's prompt and model at spawn time. before, a hook could only refuse the agent. that turns routing into code: cheap model for doc sweeps, strong model for the actual fix.

also in: prompt.change fires on non-typed prompt changes (history recall, undo, plugin fill), /advisor lands on claude platform on aws, and otel spans now carry genai semantic-convention attr

## Original README

claude code 2.1.300 is worth your update, and the reason is mods.

the headline change: agent.spawn hooks can now rewrite a workflow agent's prompt and model at spawn time. before, a hook could only refuse the agent. that turns routing into code: cheap model for doc sweeps, strong model for the actual fix.

also in: prompt.change fires on non-typed prompt changes (history recall, undo, plugin fill), /advisor lands on claude platform on aws, and otel spans now carry genai semantic-convention attr