{"type":"post","id":"claude-code-2-1-323-adds-experimental-code-af152c","slug":"claude-code-2-1-323-adds-experimental-code-af152c","title":"Claude Code 2.1.323 adds experimental Code Mode and plugin engine version ranges","description":"Claude Code 2.1.323 adds an opt-in experimental mode in which Claude writes JavaScript to call tools, alongside version-range controls for plugins.","retrieval_nugget":"Claude Code 2.1.323 adds an opt-in experimental mode in which Claude writes JavaScript to call tools, alongside version-range controls for plugins. For developers, the release changes how tool calls can be composed and gives plugin authors a way to prevent installations outside declared compatibility bounds.","published_at":"2026-11-12","updated_at":"2026-11-12","record_date":"2026-11-12","date_kind":"published_at","topics":["claude","claude-code","anthropic"],"entities":["Anthropic","Claude Code"],"related_patterns":["harness-architecture-outlives-model-choice"],"novelty_label":"new_fact","what_changed":"Claude Code 2.1.323 adds experimental Code Mode, letting Claude call tools by writing JavaScript, and introduces plugin engine version ranges.","prior_refs":["https://newruntime.com/posts/anthropic-s-claude-code-changelog-records-a-set-1c9505/","https://newruntime.com/posts/release-v2-1-318-anthropics-claude-code-77b52d/","https://newruntime.com/posts/releases-anthropics-claude-code-github-40c4ce/"],"source_url":"https://github.com/anthropics/claude-code/releases/tag/v2.1.323","source_urls":["https://github.com/anthropics/claude-code/releases/tag/v2.1.323"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:claude-code-2-1-323-adds-experimental-code-af152c","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/claude-code-2-1-323-adds-experimental-code-af152c/","markdown":"https://newruntime.com/posts/claude-code-2-1-323-adds-experimental-code-af152c.md","json":"https://newruntime.com/posts/claude-code-2-1-323-adds-experimental-code-af152c.json"},"markdown_url":"https://newruntime.com/posts/claude-code-2-1-323-adds-experimental-code-af152c.md","next_reads":[{"type":"topic","path":"/topics/claude/","url":"https://newruntime.com/topics/claude/","title":"Claude","reason":"Explore the claude topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/claude.md","json_url":"https://newruntime.com/topics/claude.json"},{"type":"topic","path":"/topics/claude-code/","url":"https://newruntime.com/topics/claude-code/","title":"Claude Code","reason":"Explore the claude-code topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/claude-code.md","json_url":"https://newruntime.com/topics/claude-code.json"},{"type":"topic","path":"/topics/anthropic/","url":"https://newruntime.com/topics/anthropic/","title":"Anthropic","reason":"Explore the anthropic topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/anthropic.md","json_url":"https://newruntime.com/topics/anthropic.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/sources/","url":"https://newruntime.com/sources/","title":"Sources","reason":"See the original sources this archive cites.","media_type":"text/html"}]}