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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.236 ·

Terminal title stops animating inside tmux, screen and zellij

Inside tmux, screen or zellij your terminal title stays static instead of animating.

You'll notice Improvements
JSON All of v2.1.236
You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
Terminal UIArea: what it touches
ImprovementsKind: in v2.1.236,
ImprovementsSection of the release
What

When Claude Code detects a terminal multiplexer, it now renders a static terminal title instead of an animated spinner, and stops scheduling the animation timer at all. The gate tengu_static_title_under_mux defaults to true, so this is live for everyone in a multiplexer unless remote config turns it off.

Details
  • Detection uses the session's multiplexer info or the TMUX, STY and ZELLIJ environment variables.
  • With the condition met, the spinner glyph is dropped from the title and no frame timer runs.
  • Outside a multiplexer, nothing changes.
Evidence

tengu_static_title_under_mux

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Read from
Feature flag
tengu_static_title_under_mux Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.236: on

Read once, for one account on one subscription tier, against v2.1.236. It isn't a statement about your account. What a flag value here can and cannot tell you

How sure we are
One source agreesOne thing we can check says the same as this entry.
The name it cites is new in this buildNew in this build: tengu_static_title_under_mux

See this entry in the whole of v2.1.236 →

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