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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.63

  • Task → Agent migration: If you have CLAUDE.md files, hooks, or permissions referencing the Task tool by name, they will continue to work — Task is retained as an alias. However, new documentation and tool output will use Agent.
  • HTTP hook security: Organizations deploying HTTP hooks should review the new allowedHttpHookUrls and httpHookAllowedEnvVars managed settings to restrict which URLs hooks can call and which environment variables can be interpolated.
  • SSH host key change: The switch to StrictHostKeyChecking=yes means marketplace plugin installations via SSH may fail if the host key isn't already in known_hosts. Run ssh -T git@<host> once manually to add it, or use HTTPS URLs for public repos.
  • /todos removed: The /todos slash command has been removed. The TodoWrite tool for in-session task tracking remains available.

See this entry in the whole of v2.1.63 →