Tach

Amber is the upper half. The top two segments are the red zone.

It is your redline, not someone else's.

Cache reads are left out, because they are cheap and would swamp the needle. It updates when a turn ends, and slides back toward zero while you are idle. Nothing leaves your machine.

Nothing goes anywhere. Here is each thing, plainly.

What it sends, and where.

• Nothing. It reads each turn's token counts from Claude Code when the turn ends, and shows a rate on your screen.
• It keeps two numbers on this machine, in Claude Code's plugin store: your window (windowMin) and your busiest rate (peak).

Which programs it runs, and why.

• None. It runs no programs.
• Every 15 seconds it reads the clock, so the bar slides back while you are idle. That is all the timer does.

What it puts in the prompts it submits.

• It submits no prompts, and changes none of yours.

What each hook does.

• session.start: adds the /tach command, loads your window and busiest rate, and starts the 15-second clock.
• turn.complete: counts the turn's fresh tokens and saves a new busiest rate if there is one.
• command.run for tach: prints the rate, sets the window, or hides or shows the band.
• ui.render for AbovePrompt: draws the bar above the prompt.