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barometer

Context and plan-limit gauges in the band above the prompt

Code you can checkTerminal + desktopBandToastBoxButtonText

What it does

  • Draws a band above the prompt, toasts
  • Hooks classic.SessionStart, session.compact, session.measure, session.start and 1 more
  • 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)

register.tsx
import type { Register } from 'claude-code'

// Drawn like barometer by Alchez (band, toast), as modscode read it from the mod's code:
// https://modscode.com/gallery/alchez-barometer/
// 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, Button } = $.ui.resolve(e)
    const model = '…'
    const reasoning = '…'
    const glyphs = '…'
    const glyphs2 = '…'
    const glyphs3 = '…'
    const tokensShown = '…'
    const tokenCount = '…'
    const label = '…'
    const glyphs4 = '…'
    const glyphs5 = '…'
    const glyphs6 = '…'
    const used = '…'
    const label2 = '…'
    const glyphs7 = '…'
    const glyphs8 = '…'
    const glyphs9 = '…'
    const label3 = '…'
    const glyphs10 = '…'
    const glyphs11 = '…'
    const glyphs12 = '…'
    const model2 = '…'
    const reasoning2 = '…'
    return (
      <Box flexDirection="column">
        <Box flexDirection="column" borderStyle="round" borderDimColor paddingX={1} marginLeft={2}>
          <Box flexDirection="column">
            <Box flexDirection="row" overflow="hidden">
              <Box flexDirection="row" flexShrink={0}>
                <Text dimColor>
                  {" | "}
                </Text>
              </Box>
              <Box flexDirection="row" flexShrink={0}>
                <Text dimColor>
                  {model}
                </Text>
                <Text dimColor>
                  {" | "}
                </Text>
              </Box>
              <Text dimColor wrap="truncate-end">
                {reasoning}
              </Text>
            </Box>
            <Box flexDirection="row">
              <Box flexDirection="column" flexGrow={1}>
                <Box flexDirection="row">
                  <Box width={8} flexShrink={0}>
                    <Text>
                      Context
                    </Text>
                  </Box>
                  <Box flexDirection="row" flexShrink={0}>
                    <Text>
                      {glyphs}
                    </Text>
                    <Text>
                      {glyphs2}
                    </Text>
                    <Text>
                      {glyphs3}
                    </Text>
                  </Box>
                  <Box width={5} justifyContent="flex-end" flexShrink={0}>
                    <Text dimColor>
                      –
                    </Text>
                  </Box>
                  <Box marginLeft={2} flexGrow={1} flexDirection="row" columnGap={1} overflow="hidden">
                    <Text dimColor wrap="truncate-end">
                      {`${tokensShown}/${tokenCount}`}
                    </Text>
                    <Button label="Compact" />
                  </Box>
                </Box>
                <Box flexDirection="row">
                  <Box width={8} flexShrink={0}>
                    <Text>
                      {label}
                    </Text>
                  </Box>
                  <Box flexDirection="row" flexShrink={0}>
                    <Text>
                      {glyphs4}
                    </Text>
                    <Text>
                      {glyphs5}
                    </Text>
                    <Text>
                      {glyphs6}
                    </Text>
                  </Box>
                  <Box width={5} justifyContent="flex-end" flexShrink={0}>
                    <Text>
                      {`${used}%`}
                    </Text>
                  </Box>
                  <Box marginLeft={2} flexGrow={1} flexDirection="row" columnGap={1} overflow="hidden" />
                </Box>
                <Box flexDirection="row">
                  <Box width={8} flexShrink={0}>
                    <Text>
                      {label2}
                    </Text>
                  </Box>
                  <Box flexDirection="row" flexShrink={0}>
                    <Text>
                      {glyphs7}
                    </Text>
                    <Text>
                      {glyphs8}
                    </Text>
                    <Text>
                      {glyphs9}
                    </Text>
                  </Box>
                  <Box width={5} justifyContent="flex-end" flexShrink={0}>
                    <Text>
                      {`${used}%`}
                    </Text>
                  </Box>
                  <Box marginLeft={2} flexGrow={1} flexDirection="row" columnGap={1} overflow="hidden" />
                </Box>
                <Box flexDirection="row">
                  <Box width={8} flexShrink={0}>
                    <Text>
                      {label3}
                    </Text>
                  </Box>
                  <Box flexDirection="row" flexShrink={0}>
                    <Text>
                      {glyphs10}
                    </Text>
                    <Text>
                      {glyphs11}
                    </Text>
                    <Text>
                      {glyphs12}
                    </Text>
                  </Box>
                  <Box width={5} justifyContent="flex-end" flexShrink={0}>
                    <Text>
                      {`${used}%`}
                    </Text>
                  </Box>
                  <Box marginLeft={2} flexGrow={1} flexDirection="row" columnGap={1} overflow="hidden" />
                </Box>
                <Text dimColor>
                  Rate: populates after first API call
                </Text>
              </Box>
              <Box flexDirection="column" alignItems="flex-end" marginLeft={2} flexShrink={0}>
                <Box flexDirection="row" />
                <Text dimColor>
                  {model2}
                </Text>
                <Text dimColor>
                  {reasoning2}
                </Text>
              </Box>
            </Box>
          </Box>
        </Box>
        {await next(e)}
      </Box>
    )
  })

  on('session.start', async ($, e, next) => {
    const message = '…'
    await $.ui.toast(`Compact failed: ${message}`)
    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.

barometer/hooks/register.tsx lines 271–430 · Band
  on('ui.render', { component: 'AbovePrompt' }, async ($, e, next) => {
    const below = await next(e)
    if (e.props.hasSurvey) return below

    const [usage, rawModel, identity, compacting, compacted, effortReading, remembered, configRows, now] = await Promise.all([
      $.session.usage(),
      $.session.model(),
      read($, account),
      read($, isCompacting),
      read($, compactedTokens),
      read($, effort),
      read($, lastLimits),
      $.config.list().catch((): ConfigRow[] => []),
      $.clock.now(),
    ])
    const { Box, Button, Text } = $.ui.resolve(e)
    const { bodyColumns, isWorking, maxRows } = e.props
    const model = modelName(rawModel)
    const email = identity?.email ?? null
    const plan = identity?.plan ?? null
    const accountLength = (email?.length ?? 0) + (plan === null ? 0 : plan.length + (email === null ? 0 : 3))
    const accountTexts: RenderElement[] = []
    if (email !== null) accountTexts.push(<Text color={ACCOUNT}>{email}</Text>)
    if (plan !== null) accountTexts.push(<Text dimColor>{email === null ? plan : ` · ${plan}`}</Text>)
    const thinkingValue = configRows.find(row => row.key === 'thinking')?.value
    const reasoning = reasoningLine(effortReading, typeof thinkingValue === 'boolean' ? thinkingValue : undefined)
    const contextWindow = usage.context.window
    const contextTokens = usage.context.tokens ?? compacted ?? undefined
    const contextPercent =
      usage.context.percent ?? (compacted === null ? undefined : Math.round((compacted / contextWindow) * 100))
    const plans = plansOf(usage, remembered, now)
    const showHint = plans.length === 0 && contextPercent === undefined
    const isFramed = maxRows >= FRAME_FROM_ROWS
    const columns = isFramed ? bodyColumns - FRAME_COLUMNS : bodyColumns
    const isCompact = columns < COMPACT_BELOW_COLUMNS || maxRows < 3
    const topPadding = maxRows - (isFramed ? FRAME_ROWS : 0) >= PAD_FROM_ROWS ? 1 : 0
    // No bottom margin: Claude Code already leaves a blank row between the band and the prompt
    const frame = (content: RenderElement) =>
      isFramed ? (
        <Box flexDirection="column" borderStyle="round" borderDimColor paddingX={FRAME_PADDING_X} marginLeft={FRAME_MARGIN_LEFT}>
          {content}
        </Box>
      ) : (
        content
      )

    // flexShrink 0 on the bar and its label and percent columns: only the detail text gives way when a row runs long
    const strip = (cells: readonly Cell[]) => (
      <Box flexDirection="row" flexShrink={0}>
        {runs(cells).map(run => (
          <Text {...run.style}>{run.glyphs}</Text>
        ))}
      </Box>
    )
    const separator = <Text dimColor>{' | '}</Text>
    const hint = <Text dimColor>Rate: populates after first API call</Text>
    const contextRedLine = redLine(contextWindow, redLines)
    const isPastRedLine = contextPercent !== undefined && contextRedLine !== null && contextPercent >= contextRedLine
    const compactButton =
      (alwaysShowCompact || isPastRedLine) && !isWorking && !compacting ? [<Button key="compact" label="Compact" onPress={() => void compactNow($)} />] : []

    if (isCompact) {
      const parts: RenderElement[][] = []
      if (columns >= IDENTITY_COLUMN_FROM) {
        if (accountTexts.length > 0) parts.push(accountTexts)
        parts.push([<Text dimColor>{model}</Text>])
        if (reasoning !== null) parts.push([<Text dimColor>{reasoning}</Text>])
      }
      if (contextPercent !== undefined) {
        parts.push([
          <Text {...colorOf(contextColor(contextPercent, contextWindow, redLines))}>{`Context: ${contextPercent}%`}</Text>,
          ...(compactButton.length > 0 ? [<Text> </Text>, ...compactButton] : []),
        ])
      } else if (compactButton.length > 0) {
        parts.push(compactButton)
      }
      for (const plan of plans) {
        const used = Math.round(plan.limit.percentUsed)
        const reset = plan.pace.resetsInMs === undefined ? [] : [<Text dimColor>{` (resets in ${duration(plan.pace.resetsInMs)})`}</Text>]
        parts.push([<Text color={planColor(used)}>{`${plan.label}: ${used}%`}</Text>, ...reset])
      }
      if (showHint) parts.push([hint])
      return (
        <Box flexDirection="column" paddingTop={topPadding}>
          {below}
          {frame(
            // Spaced, not " | "-separated: a separator ends up dangling at the end of a wrapped line
            <Box flexDirection="row" flexWrap="wrap" columnGap={FOLDED_GAP_COLUMNS}>
              {parts.map(part => (
                <Box flexDirection="row" flexShrink={0}>
                  {part}
                </Box>
              ))}
            </Box>,
          )}
        </Box>
      )
    }

    const showIdentityColumn = columns >= IDENTITY_COLUMN_FROM
    const identityColumns = showIdentityColumn ? Math.max(accountLength, model.length, reasoning?.length ?? 0) + 2 : 0
    const available = columns - LABEL_COLUMNS - PERCENT_COLUMNS - 2 - identityColumns
    const barColumns = clamp(Math.floor(available * 0.4), 10, 40)

    const gauge = (label: string, cells: readonly Cell[], percent: RenderElement, detail: RenderElement[]) => (
      <Box flexDirection="row">
        <Box width={LABEL_COLUMNS} flexShrink={0}>
          <Text>{label}</Text>
        </Box>
        {strip(cells)}
        <Box width={PERCENT_COLUMNS} justifyContent="flex-end" flexShrink={0}>
          {percent}
        </Box>
        <Box marginLeft={2} flexGrow={1} flexDirection="row" columnGap={1} overflow="hidden">
          {detail}
        </Box>
      </Box>
    )

    const contextFill = contextColor(contextPercent ?? 0, contextWindow, redLines)
    const tokensShown = contextTokens === undefined ? '?' : tokenCount(contextTokens)
    const contextRow = gauge(
      'Context',
      meterCells(barColumns, contextPercent, contextFill, contextRedLine === null ? undefined : { atPercent: contextRedLine, color: RED }),
      contextPercent === undefined ? <Text dimColor>–</Text> : <Text {...colorOf(contextFill)}>{`${contextPercent}%`}</Text>,
      [<Text dimColor wrap="truncate-end">{`${tokensShown}/${tokenCount(contextWindow)}`}</Text>, ...compactButton],
    )

    const planRows = plans.map(plan => {
      const used = Math.round(plan.limit.percentUsed)
      const color = planColor(used)
      const marker = plan.pace.elapsedPercent === undefined ? undefined : { atPercent: plan.pace.elapsedPercent, color: ELAPSED }
      const detail: RenderElement[] = []
      if (plan.pace.resetsInMs !== undefined) {
        detail.push(
          <Box flexShrink={0}>
            <Text dimColor>{`resets in ${duration(plan.pace.resetsInMs)}`}</Text>
          </Box>,
        )
      }
      if (plan.pace.runsOutInMs !== undefined) {
        detail.push(<Text dimColor>·</Text>)
        detail.push(<Text color={ORANGE} wrap="truncate-end">{`out in ~${duration(plan.pace.runsOutInMs)} at this pace`}</Text>)
      }
      return gauge(plan.label, meterCells(barColumns, used, color, marker), <Text color={color}>{`${used}%`}</Text>, detail)
    })

    const gauges = (
      <Box flexDirection="column" flexGrow={1}>
        {contextRow}
        {planRows}
        {showHint ? hint : null}
      </Box>
    )
    const identityColumn = (
      <Box flexDirection="column" alignItems="flex-end" marginLeft={2} flexShrink={0}>
        {accountTexts.length === 0 ? null : <Box flexDirection="row">{accountTexts}</Box>}
        <Text dimColor>{model}</Text>
        {reasoning === null ? null : <Text dimColor>{reasoning}</Text>}
      </Box>
Licence text (MIT)
MIT License

Copyright (c) 2026 Rohan Bansal

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 programs

The design, read from code

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 f85145a6a4ca 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 readEvery module hooks/hooks.json names was read.barometer/hooks/register.tsx
ParsesEvery file parses as TypeScript or JavaScript.1 files parsed
All its code is in the modEvery import is a file of the mod or the engine's own module; no packages, no require.all its code is in the mod
ReadableNo 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 openNetwork 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 drawsThe 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 lineWhether its repository's own .claude-plugin/marketplace.json lists it, so it installs from that marketplace with the lines on its page.listed in its repository's .claude-plugin/marketplace.json: installs from there
Programs on WindowsWhether every program it starts through $.process exists on Windows (tail, date, open, osascript, /usr/… do not).runs no program a Windows PC lacks
NetworkWhether every fetch names its https host in the code.no network
ProgramsWhether every program it starts is named in the code and is not a shell, an interpreter or a network tool.claude
Reads and sendsWhether it both reads files or environment variables and reaches the network.reaches no network
Keys in the sourceWhether the source holds what looks like an API key or a private key.no keys in the source
LicenceAn 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 is its marketplace. Add that marketplace (in the terminal with these commands, or in the desktop app's plugin settings) and install the mod from it:

/plugin marketplace add Alchez/claude-mods
/plugin install barometer@alchez

This installs the marketplace's latest commit, which may not be the one read here (f85145a6a4ca). Compare them before you install.

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 "alchez-barometer" with its code and make me a pane like it

Search them from Claude: the MCP connector

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