Auto-update session title from the regenerated recap

Feature request: auto-update the session title from the regenerated recap

Summary

Claude Code already (a) auto-generates a recap of the session and (b) has an editable session title/name that drives the terminal tab. But the two are disconnected: the title is set once (at startup, or manually via /rename) and never tracks the recap as it regenerates. Please add an option to keep the session title in sync with the latest recap.

Current behavior

• A recap is generated and regenerated during a session. It is persisted in the session transcript as a record of type: "system", subtype: "away_summary" (in ~/.claude/projects/<project>/<sessionId>.jsonl), and a new record is appended each time it regenerates.
• The session name lives in ~/.claude/sessions/<pid>.json (name + nameSource: "derived" | ...) and is what Claude Code emits to the terminal as the tab title (via OSC escape sequences).
• The title is set once — the auto-derived default (working-dir + suffix, e.g. my-app-3f) at startup, or a manual /rename. It does not follow the recap after that, so the tab stays stuck at the first-prompt/default name even as the conversation moves on.

What I'd like

An opt-in behavior: after the recap regenerates, update the session title to a short title derived from that recap (e.g. ≤5 words), so the tab reflects what the session is currently about. Ideally a settings.json toggle (e.g. "autoTitleFromRecap": true) plus a length/format hint.

Why

With many concurrent sessions (I run several in iTerm2 tabs), the tab title is the primary way to tell them apart. A title frozen at the first prompt is stale by mid-session; a recap-synced title would make the tab strip genuinely navigable.

Alternatives I tried (and why they don't work today)

• /rename from a script/hook — /rename is interactive-only; there's no CLI subcommand, hook event, or SDK call to trigger it programmatically.
• A skill that reads the latest away_summary and renames — a skill can read the recap fine, but nothing exposed to the model can invoke the built-in /rename command, so it can only hand back a paste-ready line.
• Editing name in ~/.claude/sessions/<pid>.json — the write persists to disk (it's not clobbered by the process), but the running process never re-reads name mid-session, so the live tab doesn't update.
• Setting the terminal tab title directly (printf '\033]0;…\007' OSC, or iTerm2 osascript set name) — Claude Code owns the OSC title channel and re-emits on every status change, overwriting any external title within ~1s. The only way to make an external title stick is to disable "Applications in terminal may change the title" in iTerm2 — which then kills the recap-driven title entirely.

Nice-to-have adjuncts (any one would unblock a DIY version)

• A hook event that fires on recap (re)generation, with the recap text available to the hook.
• A programmatic rename path — a CLI subcommand (claude session rename <id> "<title>") or an SDK/headless call — that updates the live session name/tab, not just the on-disk file.

Environment

• Claude Code 2.1.201
• macOS, iTerm2 3.6.11