008. A pane redraws after a key, not with it

Date

2026-08-13

Agents

Claude Code

Measured on

not recorded

Measured

2026-08-13. The Claude Code version was not recorded.

What was measured

The screen showed a C-u after 0.12 s and typed text after 0.13 s.

Mechanism

Each read of the screen after a key must poll until the screen agrees. Each poll needs a budget of its own as well as the deadline of the whole send. A pane that starts cold draws no input line, so one attempt must not use the whole send.

A unit test that gives a fixed list of screens models no delay and proves nothing. Keep the state of one box in the fake, and make each key take effect one capture later.

Incident

A read with no wait made every message fail while the text sat in the box. The tool typed again on each attempt, and the box held up to thirty copies of one message.

Screens

None.

Not measured

The delay for agy. The delay on a loaded machine.

Source

Measured by the tg-bridge project. The text is a summary of its notes, and it holds no host details and no session details.