context-meter
See the current context window fill and remaining tokens.
newpanecommand
See the current context window fill and remaining tokens.
See the current context window fill and remaining tokens.
Use it when: Check headroom before a large refactor.
Screenshot of this mod's render tree in the fixture preview, with sample data. This is not a capture of the Claude Code application. How previews are made.
claude plugin marketplace add whyashthakker/awesome-claude-code-mods
claude plugin install context-meter@awesome-claude-code-modsRun /reload-plugins in an existing session, then /context-meter. Use Tab and Enter to operate controls; Esc closes the pane. Terminal and Desktop Code tab supported; pane UI is unavailable in claude -p and the VS Code chat panel.
Try the source without installing:
claude --plugin-dir ./mods/context-meterReads session usage. No files, processes, network, or persistence.
Module variables reset on hot reload. Diagnostic history begins when the mod loads and lasts until reload or process exit; it does not reconstruct earlier activity. All display output is bounded; viewers may truncate long content to 9,000 characters. Relative file paths and Git commands use the session working directory.
Tested with Claude Code 2.1.288. Minimum documented mods version: 2.1.287. The API can change; validate against your installed version.
claude plugin validate mods/context-meter --strict
claude plugin test mods/context-meterTests cover plugin commands, pane isolation, both UI surfaces, and the behavior described in tests/register.test.ts. Drawing tests validate element trees; they do not verify pixels painted by the native apps. Validation details.
MIT licensed. No runtime packages or build step required.
hooks/register.js 38 lines1import { clean, text, code, row, frame, bar, pretty, bounded, entries, safePath } from './ui.js'
2const ID = "context-meter"
3
4export function register(on) {
5 on('session.start', async ($, e, next) => {
6
7 await $.command.register({name:ID, description:"See the current context window fill and remaining tokens.", immediate:true, argumentHint:""})
8 return next(e)
9 })
10 on('command.run', {command:"context-meter"}, async ($, e) => {
11
12 await $.ui.open({id:ID,title:"Context Meter",focus:true,closeOnEscape:true})
13 return {}
14 })
15
16 on('ui.render', {component:'Pane'}, async ($, e, next) => {
17 if(e.requestId !== ID) return next(e)
18 const E = $.ui.resolve(e)
19 try {
20 const body = await draw($, E)
21 return frame(E,"Context Meter","See the current context window fill and remaining tokens.",body)
22 } catch(error) {
23 return frame(E,"Context Meter",'Unable to inspect this data.',[text(E,error.message,{color:'yellow'}),E.Button({key:'refresh',label:'Refresh',onPress:()=>$.ui.invalidate('ui.render')})])
24 }
25 })
26}
27async function draw($, E) {
28 const refresh = E.Button({key:'refresh',label:'Refresh',hotkey:'r',plain:true,onPress:()=>$.ui.invalidate('ui.render')})
29
30const u = await $.session.usage()
31const c = u.context
32if(c.tokens===undefined || c.percent===undefined) return [text(E,'Context usage not reported yet.'),text(E,'Window: '+c.window+' tokens'),refresh]
33return [text(E, bar(c.percent), {color:c.percent >= 80 ? 'yellow' : 'green'}),
34 text(E, Number(c.tokens).toLocaleString() + ' / ' + Number(c.window).toLocaleString() + ' tokens'),
35 text(E, Math.max(0,c.window-c.tokens).toLocaleString() + ' tokens remaining'), refresh]
36
37}
38hooks/ui.js 36 lines1// Pure UI helpers. No engine access; each plugin contains its own copy.
2export function clean(value, limit = 9000) {
3 return String(value ?? '').replace(/[\u0000-\u0008\u000b\u000c\u000e-\u001f\u007f-\u009f]/g, '').slice(0, limit)
4}
5export function text(E, value, props = {}) {
6 return E.Text({ ...props, children: [clean(value)] })
7}
8export function code(E, value, language = 'text') {
9 return E.Code({ source: clean(value), language })
10}
11export function row(E, children) {
12 return E.Box({ flexDirection: 'row', columnGap: 2, flexWrap: 'wrap', children })
13}
14export function frame(E, title, subtitle, children) {
15 return E.Box({ flexDirection: 'column', gap: 1, children: [
16 text(E, title, { bold: true, color: 'cyan' }),
17 text(E, subtitle, { dimColor: true }), ...children,
18 ] })
19}
20export function bar(percent, width = 24) {
21 const p = Math.max(0, Math.min(100, Number(percent) || 0))
22 const n = Math.round(p / 100 * width)
23 return '[' + '#'.repeat(n) + '-'.repeat(width - n) + '] ' + p.toFixed(1) + '%'
24}
25export function pretty(value) { return JSON.stringify(value, null, 2) }
26export function bounded(value, max = 9000) {
27 if (value.length > max) throw new Error('Input exceeds ' + max + ' characters. Use a smaller selection.')
28 return value
29}
30export function entries(value) { return value && typeof value === 'object' ? Object.entries(value) : [] }
31export function safePath(value) {
32 const path = value.trim()
33 if (!path || path.startsWith('-') || /[\x00-\x1f]/.test(path)) throw new Error('Enter a path without control characters or leading flags.')
34 return path
35}
36