Claude Code v2.1.309

Claude Code v2.1.309 is a fix-heavy release focused on sandbox and permission hardening: sandboxed Bash no longer runs shell startup files outside the sandbox, symlinked paths no longer slip past macOS denyWrite rules, and sandboxed commands can no longer edit the --mcp-config file.

Why it matters

For teams that let Claude Code run commands with auto-accepted edits or in a sandbox, this release closes several ways commands could act outside the limits you set, so the guardrails behave the way they read.

What's new

• Sandboxed Bash on macOS and Linux no longer runs the shell's startup files outside the sandbox before each command.
• macOS sandbox denyWrite globs now apply at a path's real location when its folder is reached through a symlink, and profile store write protection now holds through symlinked config directories.
• Sandboxed commands and auto-accepted edits can no longer modify the MCP config file passed with --mcp-config, and a disabled MCP server is no longer reconnected by a later permission prompt in print and SDK sessions.
• Bash permission checks were tightened: compound commands that change directory before running git now prompt as a plain cd does, and an Edit(path) deny rule now blocks Bash redirects to that path in more cases.
• Other fixes include repeated compaction under a very large nested CLAUDE.md (oversized files now load only their start) and ctrl+enter send-now behavior.

Taken from the project's own release notes. Claims about speed or accuracy are the maker's unless stated otherwise.

Quick facts

Links

• Official site: https://code.claude.com/docs/en/overview
• Repository: https://github.com/anthropics/claude-code
• Release notes: https://github.com/anthropics/claude-code/releases/tag/v2.1.309
• Docs: https://code.claude.com/docs/en/setup

Related ranking

See how established tools compare in Best AI Coding Tools for Developers. New releases aren't scored until we review them against the rubric.

What we couldn't verify

• quick_facts.pricing

Checked 2026-10-23 from the release notes's own pages. Prices and star counts change, so confirm on the official site. Listing here is not a ranking or an endorsement.