usage-band by cmbaldwin: Claude Code mod code and design

What it does

Draws a band above the prompt, toasts
Hooks session.measure, session.start, skill.prompt, turn.complete and 1 more
Keeps its own state between turns
Starts processes

Good points

No network calls
Written in TypeScript
Handles errors
Writes no files

Code to start from

Two kinds: a starter modscode writes from the design above, and the lines of the mod's own code that draw it.

Starter (register.tsx)

import type { Register } from 'claude-code'

// Drawn like usage-band by cmbaldwin (band, toast), as modscode read it from the mod's code:
// https://modscode.com/gallery/cmbaldwin-usage-band/
// Written by modscode from that reading, not copied from the mod: use it as you like.
// Each value below stands for one the mod works out at run time; put in your own.
export const register: Register = on => {
  // the band above the prompt; what else goes there is drawn under it
  on('ui.render', { component: 'AbovePrompt' }, async ($, e, next) => {
    const { Box, Text } = $.ui.resolve(e)
    const t = '…'
    const t2 = '…'
    const t3 = '…'
    const t4 = '…'
    const t5 = '…'
    const t6 = '…'
    const t7 = '…'
    const t8 = '…'
    const t9 = '…'
    const t10 = '…'
    const t11 = '…'
    const t12 = '…'
    const t13 = '…'
    const t14 = '…'
    const t15 = '…'
    const t16 = '…'
    const t17 = '…'
    const t18 = '…'
    const t19 = '…'
    const t20 = '…'
    const t21 = '…'
    const t22 = '…'
    const t23 = '…'
    const t24 = '…'
    const t25 = '…'
    const t26 = '…'
    const t27 = '…'
    return (
      <Box flexDirection="column">
        <Box borderStyle="round" borderColor="#3f3f46" backgroundColor="#141417" paddingX={1} gap={1} alignSelf="flex-start">
          <Text color="#3f3f46" backgroundColor="#141417">
            │
          </Text>
          <Box gap={1}>
            <Text>
              <Text backgroundColor="#141417">
                {t}
              </Text>
              <Text backgroundColor="#141417">
                {t2}
              </Text>
              <Text backgroundColor="#141417">
                {t3}
              </Text>
            </Text>
            <Text>
              <Text backgroundColor="#141417">
                {t4}
              </Text>
              <Text backgroundColor="#141417">
                {t5}
              </Text>
              <Text backgroundColor="#141417">
                {t6}
              </Text>
            </Text>
            <Text>
              <Text backgroundColor="#141417">
                {t7}
              </Text>
              <Text backgroundColor="#141417">
                {t8}
              </Text>
              <Text backgroundColor="#141417">
                {t9}
              </Text>
            </Text>
          </Box>
          <Text color="#3f3f46" backgroundColor="#141417">
            │
          </Text>
          <Box gap={1}>
            <Text>
              <Text backgroundColor="#141417">
                {t10}
              </Text>
              <Text backgroundColor="#141417">
                {t11}
              </Text>
              <Text backgroundColor="#141417">
                {t12}
              </Text>
            </Text>
            <Text>
              <Text backgroundColor="#141417">
                {t13}
              </Text>
              <Text backgroundColor="#141417">
                {t14}
              </Text>
              <Text backgroundColor="#141417">
                {t15}
              </Text>
            </Text>
            <Text>
              <Text backgroundColor="#141417">
                {t16}
              </Text>
              <Text backgroundColor="#141417">
                {t17}
              </Text>
              <Text backgroundColor="#141417">
                {t18}
              </Text>
            </Text>
          </Box>
          <Text color="#3f3f46" backgroundColor="#141417">
            │
          </Text>
          <Box gap={1}>
            <Text>
              <Text backgroundColor="#141417">
                {t19}
              </Text>
              <Text backgroundColor="#141417">
                {t20}
              </Text>
              <Text backgroundColor="#141417">
                {t21}
              </Text>
            </Text>
            <Text>
              <Text backgroundColor="#141417">
                {t22}
              </Text>
              <Text backgroundColor="#141417">
                {t23}
              </Text>
              <Text backgroundColor="#141417">
                {t24}
              </Text>
            </Text>
            <Text>
              <Text backgroundColor="#141417">
                {t25}
              </Text>
              <Text backgroundColor="#141417">
                {t26}
              </Text>
              <Text backgroundColor="#141417">
                {t27}
              </Text>
            </Text>
          </Box>
        </Box>
        {await next(e)}
      </Box>
    )
  })

  on('session.start', async ($, e, next) => {
    const pct = '…'
    await $.ui.toast(`Context ${pct}% full. Consider /compact.`)
    return next(e)
  })
}

The mod's own code

Shown under the mod's licence (MIT); its text is below. Keep the notice if you copy these lines.

usage-band/hooks/register.tsx lines 131–163 · Band

usage-band/hooks/register.tsx:131

  on('ui.render', { component: 'AbovePrompt' }, async ($, e, next) => {
    const u = await read($, usage)
    const hasData = u.ctxPct !== null || u.limits.length > 0 || u.usd !== null || u.jev !== null || u.branch !== null || u.cache !== null
    if (e.props.hasSurvey || !hasData) return next(e)

    const { Box, Text, Raster } = $.ui.resolve(e)
    const segs = fit(u, u.now, e.props.bodyColumns, icons)

    // one rounded, left-aligned box; dim dividers between segments; shrinks to its content
    const cells = segs.flatMap((seg, i) => {
      const body = (
        <Box key={seg.key} gap={1}>
          {seg.groups.map((g, gi) => (
            <Text key={gi}>
              {g.map((r, ri) => (
                <Text key={ri} color={r.c && (PAL[r.c] ?? r.c)} backgroundColor={r.bg ? (PAL[r.bg] ?? r.bg) : CARD} dimColor={r.d} bold={r.b}>{r.t}</Text>
              ))}
            </Text>
          ))}
          {seg.spark ? (
            <Raster key={`${seg.key}-spark`} columns={seg.spark.buckets.length} rows={1} cells={new Uint8Array(sparkWords(seg.spark).buffer).toBase64()} />
          ) : null}
        </Box>
      )
      return i ? [<Text key={`d${i}`} color="#3f3f46" backgroundColor={CARD}>│</Text>, body] : [body]
    })

    return (
      <Box borderStyle="round" borderColor="#3f3f46" backgroundColor={CARD} paddingX={1} gap={1} alignSelf="flex-start">
        {cells}
      </Box>
    )
  })

Licence text (MIT)

MIT License

Copyright (c) 2026 cmbaldwin

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

What its code calls

runs programsreads filesenv varsremembers

The design, read from code

Claude — Code

Context 42% full. Consider /compact.

Ask Claude…

Drawn from the mod's source at the commit read, not from a run: a list is drawn three times, a condition takes its first branch that draws in the desktop app, and a value only the run time knows is shown as a made-up sample (dotted underline) or left out. Colours and type are this site's.

What its code shows

Read from the source at commit 3a1475f5c536 on 2026-10-06. The first group decides whether a mod is listed; the rest is for you to weigh. A later commit is not read until the next crawl.

Decides the listing: code you can check
Entry read	Every module hooks/hooks.json names was read.usage-band/hooks/register.tsx
Parses	Every file parses as TypeScript or JavaScript.2 files parsed
All its code is in the mod	Every import is a file of the mod or the engine's own module; no packages, no require.all its code is in the mod
Readable	No minified lines, no eval or new Function, no import of a computed path, no encoded blobs.no minified code, no eval, no encoded blobs
Calls in the open	Network and programs are reached as $.http.fetch and $.process.run in place, never passed around.every call outside goes through $ in the open
For you to weigh before installing
Where it draws	The terminal, the desktop app, both, or nothing (hooks only: a guard or a prompt rewriter), as its code says. Shown, never a reason to leave a mod out.draws in the terminal and the desktop app, the same in both
Install line	Whether its repository's own .claude-plugin/marketplace.json lists it, so it installs from that marketplace with the lines on its page.its repository's .claude-plugin/marketplace.json does not list it: no install line to give
Programs on Windows	Whether every program it starts through $.process exists on Windows (tail, date, open, osascript, /usr/… do not).runs no program a Windows PC lacks
Network	Whether every fetch names its https host in the code.no network
Programs	Whether every program it starts is named in the code and is not a shell, an interpreter or a network tool.git (reaches the network)
Reads and sends	Whether it both reads files or environment variables and reaches the network.reads environment variables and files and reaches the network
Keys in the source	Whether the source holds what looks like an API key or a private key.no keys in the source
Licence	An open licence (MIT, Apache-2.0, BSD, ISC, Unlicense, 0BSD, CC0) with its text lets modscode show its code; otherwise the code is linked.MIT

This is a reading of the code text, not a security review: it does not run the mod, and it cannot see what a program the mod starts does. The check before installing is yours. How mods are chosen

Install it

Check it yourself before you install it. Mods run unsandboxed, with your permissions, and modscode does not vouch for what this code does. Read the code below (or run claude plugin validate . in its folder), weigh what it reaches, and install the commit you read.

Its repository's .claude-plugin/marketplace.json does not list it, so there is no install line to give. Read it as code, or follow its author's README.

Ask Claude about it

With the modscode connector added, Claude can read this design, what its code reaches and its code, and build on them. Ask it like this:

Read the modscode design "cmbaldwin-usage-band" with its code and make me a pane like it

Search them from Claude: the MCP connector