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Claude Code v2.1.261 ·

--resume can now adopt/accept custom (non-UUID) session IDs when used with SDK URL sessions

--resume can now accept custom, non-UUID session IDs for SDK URL sessions.

Use it now Notable Improvements
JSON All of v2.1.261
Use it nowTier: how much it should matter to you
3Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SessionsArea: what it touches
ImprovementsKind: in v2.1.261,
What probably matters to youSection of the release

A new helper decides whether a resumed session ID is adopted and whether the resume is effectively a fork. --resume now accepts custom, non-UUID session IDs specifically when d.sdkUrl is set, for SDK URL sessions. The returned message bundle now also reports resumedAsFork.

Read from
Names in the bundle--resume
What the documentation says
--resume Claude Code changelog modified, high confidence * Fixed `-p --resume`/`--continue` (as used by the desktop app) failing on every retry once a session's worktree directory lost its git metadata; it now fails once, then resumes without the worktree see the edit
--resume Model configuration modified, high confidence * **You resumed a session.** A session you resume with `claude --resume` or `--continue` usually [keeps the model it was using](#setting-your-model) rather than your current default. see the edit
--resume Claude Code changelog modified, high confidence * Fixed `claude -p --resume <file>` adopting a malformed session ID recorded in the transcript; it now resumes under a fresh session ID instead see the edit
Since it was published

The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.

Added since A small documentation edit on Common workflows touched a line naming --resume after this was published. | [`/loop`](/docs/en/scheduled-tasks) | The current CLI session | Quick polling while a session is open. `--resume` and `--continue` restore unexpired fixed-interval loops. | common-workflows see the edit
Confirmed since Anthropic's documentation has since written up --resume, on Claude Code changelog. * Improved `--continue` / `--resume`: the conversation appears immediately instead of waiting for SessionStart hooks, and the first message no longer re-reads the whole transcript changelog see the edit
How sure we are
Two sources agreeTwo things we can check say the same as this entry.
Anthropic's documentation agrees--resume on Claude Code changelog
Anthropic's release notes agreeFixed claude -p --resume <file> adopting a malformed session ID recorded in the transcript; it now resumes under a fresh session ID instead

See this entry in the whole of v2.1.261 →

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