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## What Marks `session/list` and `_session/list/changes` rows whose session runs in a linked Git worktree that Claude Code itself created (`claude --worktree`, the `EnterWorktree` tool), as `_meta.jetbrains.air.agentWorktree: true`. A new agent capability `sessionWorktrees`, advertised together with `sessionIndex`, tells the client that rows carry the field, so a missing field means "not made by the agent" rather than "unknown". ## Why With `includeWorktrees`, a client gets sessions from every linked worktree with nothing to tell them apart. A worktree Claude Code made for a session belongs to the project the user started it from; a worktree the user made by hand is a separate checkout. Only the agent knows which is which. ## How - The rule reads the transcript's `worktree-state` records: the latest one wins; the session counts only when `worktreeSession` is non-null and `enteredExisting` is not `true`. `environment.isWorktree` is not used, since plain git detection is also true for user-made worktrees. - The record is parsed in the existing head/tail transcript scan, so no extra file reads. The row is marked only when its `cwd` is in a linked worktree (`<common-dir>/worktrees/<name>`), never for the main checkout or a submodule. - The row's `cwd` stays the session's own directory. The field is `true` or absent. Proposed as `SessionInfo.agentWorktree` plus a `agentWorktrees` capability marker in the session list extensions RFD: agentclientprotocol/agent-client-protocol#2323. Docs: `docs/air-extensions.md`. ## Tests `src/tests/session-index.test.ts`: marked worktree, `enteredExisting`, no record (user worktree), a later `null` record, main checkout, `_session/list/changes` rows, capability negotiation, and scan windows. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>