/ 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.

The build it came inv2.1.63

28 Feb 2026 · 25 entries, this one is #25.

Either side of it

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Names in this entry

toolTask
Tools gain a backgrounding setting controlling whether they can keep running in the background
toolAgent
Subagent launching gets a nesting-depth cap, a bypassable concurrency cap, and new teammate/model-inherit rules
settingallowedHttpHookUrls
Limit which URLs HTTP hooks can target
settinghttpHookAllowedEnvVars
Limit which env vars HTTP hooks can put in headers
toolTodoWrite
Before a usage limit cuts you off, your work can be committed to a hidden git ref with resume notes.

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