---
type: "post"
id: "anthropic-s-claude-code-changelog-records-a-set-1c9505"
slug: "anthropic-s-claude-code-changelog-records-a-set-1c9505"
title: "Anthropic’s Claude Code changelog records a set of changes to its mods extension surface and runtime behavior"
description: "Anthropic’s Claude Code changelog records a set of changes to its mods extension surface and runtime behavior."
retrieval_nugget: "Anthropic’s Claude Code changelog records a set of changes to its mods extension surface and runtime behavior."
published_at: "2026-10-23"
updated_at: "2026-10-23"
record_date: "2026-10-23"
date_kind: "published_at"
topics: ["claude","claude-code","anthropic"]
entities: ["Anthropic","Claude Code","Amazon Bedrock","Google Vertex AI","Microsoft Foundry"]
related_patterns: ["harness-architecture-outlives-model-choice","skills-become-portable-capability-layer"]
novelty_label: "new_fact"
what_changed: "Claude Code 2.1.310 adds runtime and cloud-session changes, plus improved mod Image rendering—updates beyond the earlier TypeScript mods launch."
prior_refs: ["memory:24efddc6-3cdb-8a93-a689-f1d9bc800f44","memory:1844c76c-190d-8800-a284-c0057d5369e1"]
source_url: "https://code.claude.com/docs/en/changelog"
source_urls: ["https://code.claude.com/docs/en/changelog"]
schema_version: "newruntime-agent-readable-v0.2"
stable_id: "post:anthropic-s-claude-code-changelog-records-a-set-1c9505"
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"]}
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---

# Anthropic’s Claude Code changelog records a set of changes to its mods extension surface and runtime behavior

## Retrieval answer

Anthropic’s Claude Code changelog records a set of changes to its mods extension surface and runtime behavior.

Anthropic’s Claude Code changelog records a set of changes to its mods extension surface and runtime behavior. Versions 2.1.299 and 2.1.300, dated October 14, 2026, added prompt media and session identity functions for managed mods, prompt decorations, a `prompt.change` hook, and the ability for an `agent.spawn` hook to rewrite a workflow agent’s prompt and model.

Version 2.1.304, dated October 19, added a transcript entry when a plugin skips a mod hook. Its `tool.check` event gained `decider: "person"` and `e.isReadOnly`; the former limits approval to the permission dialog or a host callback. The release also changed `settings.read` hooks to receive individual settings layers and added mod rendering in the VS Code chat panel for Bedrock, Vertex AI, Foundry, LLM-gateway, and telemetry-disabled sessions.

Version 2.1.309 on October 22 fixed a failure in the mod `turn.step` hook when a model alias such as `haiku` was used. The current page also lists version 2.1.310, dated October 23. The changelog does not establish which third-party mods are compatible, secure, or generally available across every Claude Code deployment.

Source: https://code.claude.com/docs/en/changelog

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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