Ranking|Claude Code Mods

ModsCode / Claude Code Mods / Ranking / context-keeper

context-keeper

Live context-window panel: what fills it, checkpoints before you compact or clear, and nudges before you hit the wall.

Code you can checkTerminal + desktopPaneStatus lineToastBoxButtonInputText
writes files, drives Claude, draws

What it does

  • Draws a pane, the status line, toasts
  • Adds /ctx, /checkpoint, /resume-checkpoint
  • Hooks session.compact, session.start, turn.complete
  • Keeps its own state between turns

Good points

  • No network calls
  • Starts no processes
  • Small: 357 lines
  • Written in TypeScript

Code to start from

A starter ModsCode writes from the drawing it read, and the mod's own lines that draw, where there are any.

Starter (register.tsx)

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

// Drawn like context-keeper by Michael Goldenberg (pane, status, toast), as ModsCode read it from the mod's code:
// https://modscode.com/claude-mods/mods/mishgoldenberg-context-keeper/
// 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 pane: open it with $.ui.open({ id: 'my-pane', title: "Context" })
  on('ui.render', { component: 'Pane', requestId: 'my-pane' }, async ($, e) => {
    const { Box, Text, Button, Input } = $.ui.resolve(e)
    const glyph = '…'
    const pct = '…'
    const k = '…'
    const k2 = '…'
    const name = '…'
    const k3 = '…'
    const name2 = '…'
    const k4 = '…'
    const name3 = '…'
    const k5 = '…'
    const at = '…'
    const t = '…'
    const t2 = '…'
    const t3 = '…'
    const working = '…'
    const toLocaleTimeString = '…'
    const kind = '…'
    const percent = '…'
    const toLocaleTimeString2 = '…'
    const kind2 = '…'
    const percent2 = '…'
    const toLocaleTimeString3 = '…'
    const kind3 = '…'
    const percent3 = '…'
    return (
      <Box flexDirection="column" gap={1}>
        <Box flexDirection="column">
          <Box gap={1}>
            <Text>
              {glyph}
            </Text>
            <Text bold>
              context-keeper
            </Text>
            <Text dimColor wrap="truncate-end">
              {`${pct}% full · ${k} left`}
            </Text>
          </Box>
          <Text>
            ████████░░░░░░░░
          </Text>
          <Text dimColor wrap="truncate-end">
            {k}
            {" of "}
            {k2}
            {" tokens"}
          </Text>
        </Box>
        <Box flexDirection="column">
          <Box gap={1}>
            <Text dimColor>
              What fills it
            </Text>
          </Box>
          <Box flexDirection="column">
            <Text dimColor>
              No breakdown yet. It fills in after the first turn.
            </Text>
            <Box gap={1}>
              <Box flexGrow={1} flexShrink={1}>
                <Text wrap="truncate-end">
                  {name}
                </Text>
              </Box>
              <Box flexShrink={0} justifyContent="flex-end">
                <Text>
                  {k3}
                </Text>
              </Box>
              <Text dimColor>
                ████████░░░░░░░░
              </Text>
            </Box>
            <Box gap={1}>
              <Box flexGrow={1} flexShrink={1}>
                <Text wrap="truncate-end">
                  {name2}
                </Text>
              </Box>
              <Box flexShrink={0} justifyContent="flex-end">
                <Text>
                  {k4}
                </Text>
              </Box>
              <Text dimColor>
                ████████░░░░░░░░
              </Text>
            </Box>
            <Box gap={1}>
              <Box flexGrow={1} flexShrink={1}>
                <Text wrap="truncate-end">
                  {name3}
                </Text>
              </Box>
              <Box flexShrink={0} justifyContent="flex-end">
                <Text>
                  {k5}
                </Text>
              </Box>
              <Text dimColor>
                ████████░░░░░░░░
              </Text>
            </Box>
            <Text dimColor wrap="truncate-end">
              {"Largest memory file: "}
              {at}
              {" ("}
              0
              )
            </Text>
          </Box>
        </Box>
        <Box flexDirection="column">
          <Box gap={1}>
            <Text dimColor>
              Tips
            </Text>
          </Box>
          <Text dimColor>
            {"• "}
            {t}
          </Text>
          <Text dimColor>
            {"• "}
            {t2}
          </Text>
          <Text dimColor>
            {"• "}
            {t3}
          </Text>
        </Box>
        <Box flexDirection="column">
          <Box gap={1}>
            <Text dimColor>
              Actions
            </Text>
          </Box>
          <Box flexDirection="column">
            <Text color="claude">
              ●
              {" "}
              {working}
            </Text>
            <Box gap={1} flexWrap="wrap">
              <Button hotkey="c" variant="primary" label="Checkpoint" />
              <Button hotkey="k" label="Checkpoint + compact" />
              <Button hotkey="r" label="Refresh" />
            </Box>
            <Input label="Compact, keeping:" placeholder="e.g. the auth refactor and failing tests" submitLabel="Compact" />
          </Box>
        </Box>
        <Box flexDirection="column">
          <Box gap={1}>
            <Text dimColor>
              Checkpoints
            </Text>
          </Box>
          <Box flexDirection="column">
            <Text dimColor>
              None yet. A checkpoint is a handoff note (goal, decisions, files, TODOs) you can reload after /clear.
            </Text>
            <Box gap={1}>
              <Text color="success">
                ✓
              </Text>
              <Text dimColor wrap="truncate-end">
                {toLocaleTimeString}
                {" "}
                {kind}
                {" at "}
                {percent}
                %
              </Text>
              <Button plain label="load" />
            </Box>
            <Box gap={1}>
              <Text color="success">
                ✓
              </Text>
              <Text dimColor wrap="truncate-end">
                {toLocaleTimeString2}
                {" "}
                {kind2}
                {" at "}
                {percent2}
                %
              </Text>
              <Button plain label="load" />
            </Box>
            <Box gap={1}>
              <Text color="success">
                ✓
              </Text>
              <Text dimColor wrap="truncate-end">
                {toLocaleTimeString3}
                {" "}
                {kind3}
                {" at "}
                {percent3}
                %
              </Text>
              <Button plain label="load" />
            </Box>
          </Box>
        </Box>
      </Box>
    )
  })

  on('session.start', async ($, e, next) => {
    const percent = '…'
    await $.ui.status(`ctx ${percent}%`)
    await $.ui.toast(`Already writing a checkpoint, one moment…`)
    await $.ui.toast(`Nothing to checkpoint yet: a checkpoint summarizes the conversation, and this session has none. Chat first, then try ag…`)
    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.

plugins/context-keeper/hooks/register.tsx lines 244–356 · Pane
  on('ui.render', { component: 'Pane', requestId: PANE }, async ($, e) => {
    const els = $.ui.resolve(e)
    const { Box, Text, Button } = els
    const Input = 'Input' in els ? els.Input : undefined
    const snap = await read($, snapshot)
    const cps = await read($, checkpoints)
    const working = await read($, busy)
    const width = Math.max(10, Math.min(40, (e.props.bodyColumns ?? 40) - 12))

    const kit = { Box, Text }

    if (snap === null) {
      return (
        <Box flexDirection="column" gap={1}>
          {header(kit, GLYPH.off, TONE.dim, 'context-keeper', 'no reading yet')}
          {empty(kit, 'The context reading updates after every turn. Measure now to see what fills the window already.')}
          <Box>
            <Button key="refresh" hotkey="r" variant="primary" label="Measure now" onPress={() => void refresh($)} />
          </Box>
        </Box>
      )
    }

    const pct = Math.round(snap.percent)
    const tone = snap.percent >= checkpointAt ? TONE.bad : snap.percent >= warnAt ? TONE.warn : TONE.accent
    const glyph = snap.percent >= warnAt ? GLYPH.warn : GLYPH.on
    const tips = snap.categories.map(c => TIPS[c.name]).filter((t): t is string => t !== undefined).slice(0, 2)

    return (
      <Box flexDirection="column" gap={1}>
        <Box flexDirection="column">
          {header(kit, glyph, tone, 'context-keeper', `${pct}% full · ${k(Math.max(0, snap.window - snap.tokens))} left`)}
          <Text color={tone}>{bar(snap.percent, width)}</Text>
          <Text dimColor wrap="truncate-end">
            {k(snap.tokens)} of {k(snap.window)} tokens
          </Text>
        </Box>

        {section(
          kit,
          'What fills it',
          <Box flexDirection="column">
            {snap.categories.length === 0 && empty(kit, 'No breakdown yet. It fills in after the first turn.')}
            {snap.categories.slice(0, 7).map(c => (
              <Box gap={1}>
                <Box flexGrow={1} flexShrink={1}>
                  <Text wrap="truncate-end">{c.name}</Text>
                </Box>
                {num(kit, k(c.tokens), 7)}
                <Text dimColor>{bar((c.tokens / Math.max(1, snap.window)) * 100, 12)}</Text>
              </Box>
            ))}
            {snap.memoryFiles.length > 0 && (
              <Text dimColor wrap="truncate-end">
                Largest memory file: {snap.memoryFiles[0]?.path.split(/[\/]/).at(-1)} ({k(snap.memoryFiles[0]?.tokens ?? 0)})
              </Text>
            )}
          </Box>,
        )}

        {tips.length > 0 &&
          section(
            kit,
            'Tips',
            tips.map(t => <Text dimColor>• {t}</Text>),
          )}

        {section(
          kit,
          'Actions',
          <Box flexDirection="column">
            {working !== null && <Text color={TONE.accent}>{GLYPH.on} {working}</Text>}
            <Box gap={1} flexWrap="wrap">
              <Button key="checkpoint" hotkey="c" variant="primary" label="Checkpoint" onPress={() => void writeHandoff($, 'manual')} />
              <Button key="compact" hotkey="k" label="Checkpoint + compact" onPress={() => void writeHandoff($, 'before compact').then(() => $.command.run({ command: 'compact' }))} />
              <Button key="refresh" hotkey="r" label="Refresh" onPress={() => void refresh($)} />
            </Box>
            {Input !== undefined && (
              <Input
                key="focus"
                label="Compact, keeping:"
                placeholder="e.g. the auth refactor and failing tests"
                submitLabel="Compact"
                onSubmit={(value: string) => void $.command.run({ command: 'compact', args: value })}
              />
            )}
          </Box>,
        )}

        {section(
          kit,
          'Checkpoints',
          <Box flexDirection="column">
            {cps.length === 0 && empty(kit, 'None yet. A checkpoint is a handoff note (goal, decisions, files, TODOs) you can reload after /clear.')}
            {cps.slice(0, 4).map((cp, i) => (
              <Box gap={1}>
                <Text color={TONE.ok}>{GLYPH.ok}</Text>
                <Text dimColor wrap="truncate-end">
                  {new Date(cp.at).toLocaleTimeString()} {cp.kind} at {Math.round(cp.percent)}%
                </Text>
                <Button
                  key={`load-${i}`}
                  plain
                  label="load"
                  onPress={() => void $.prompt.fill({ text: `Read ${cp.path} and continue the work from where it left off. Confirm the next step before acting.` })}
                />
              </Box>
            ))}
          </Box>,
        )}
      </Box>
    )
  })
plugins/context-keeper/hooks/register.tsx lines 12–20 · Pane
function header({ Box, Text }: Kit, glyph: string, tone: string, name: string, status: string) {
  return (
    <Box gap={1}>
      <Text color={tone}>{glyph}</Text>
      <Text bold>{name}</Text>
      <Text dimColor wrap="truncate-end">{status}</Text>
    </Box>
  )
}
plugins/context-keeper/hooks/register.tsx lines 45–47 · Pane
function empty({ Text }: Kit, text: string) {
  return <Text dimColor>{text}</Text>
}
plugins/context-keeper/hooks/register.tsx lines 23–33 · Pane
function section({ Box, Text }: Kit, label: string, rows: RenderChildren, aside?: RenderChildren) {
  return (
    <Box flexDirection="column">
      <Box gap={1}>
        <Text dimColor>{label}</Text>
        {aside}
      </Box>
      {rows}
    </Box>
  )
}
plugins/context-keeper/hooks/register.tsx lines 36–42 · Pane
function num({ Box, Text }: Kit, value: string, width: number, color?: string) {
  return (
    <Box width={width} flexShrink={0} justifyContent="flex-end">
      <Text color={color}>{value}</Text>
    </Box>
  )
}
Licence text (MIT)
MIT License

Copyright (c) 2026 Michael Goldenberg

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.

How to build this: Pane (panel), Add a slash command

What its code calls

writes filesdrives Clauderememberscalls tools

What its code shows

Read from the source at commit 0954c978c110 on 2026-10-11. 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.plugins/context-keeper/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.starts no programs
Reads and sendsWhether it both reads something of yours (files, environment variables, the transcript, settings) and reaches outside (the network, an MCP server, another session, telemetry).reads files, but reaches nothing outside
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
Settings hooksHooks declared in hooks/hooks.json or plugin.json beside the module: a command (a shell when it has no args), an HTTP request, an MCP tool or a model prompt at an event. They run outside $.no settings hooks: its function hooks alone
Servers it shipsMCP servers (a program, or a URL; a headersHelper is a shell command; a .mcpb bundle is unpacked at run time), LSP servers, monitors (a shell command for the whole session) and bin/ (on the PATH of the Bash tool).ships no MCP or LSP server, no monitor, no bin/
Skills, commands, agentsWhat its Markdown declares beyond text: allowed-tools granted for the turn, hooks added when a skill is invoked, a command run before Claude reads the skill.no skills, commands, agents or workflows
Tools and MCPWhether every tool it calls through $.tool.call and $.mcp.call is named in the code, and none is a shell (Bash through the tool runs a shell without $.process).command.run: /compact
Asks of the modelCompletions it runs ($.model.complete, fork, classify), subagents it spawns, prompts it submits as you, and the tools, commands and agents it adds.model.fork (sends its own transcript), adds command ctx, adds command checkpoint, adds command resume-checkpoint
Events it hooksBy what a hook there can do: gates (refuse a tool call, a prompt, a setting, another plugin), shapes (what the model reads: the system prompt, tool descriptions, each request), reads (your input, the events of the settings hooks, every event with *), and the rest.gates: command.run (ctx, checkpoint, resume-checkpoint) · also: session.start, turn.complete, session.compact, ui.render (Pane)
Reads, by nameThe environment variables and files it names, and whether it reads the transcript, settings.json, the prompt box or the mouse selection.files, by names the check can't read
Writes, by nameThe files and environment variables it names, and whether it changes settings, the prompt box, the clipboard, the conversation (a row the model reads) or another session.files: a path computed at run time; the prompt box

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 its code (or run claude plugin validate . in its folder), weigh what it reaches, and install the commit you read.

From its marketplace

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 mishgoldenberg/claude-mods
/plugin install context-keeper@claude-mods
/reload-plugins

This installs the marketplace's latest commit, which may not be the one read here (0954c978c110). Compare them before you install. /reload-plugins loads it into a session that is already open.

Try the commit ModsCode read

No marketplace needed. In a terminal, clone the repository, check out the commit read, validate the mod, and load it for one session:

git clone https://github.com/mishgoldenberg/claude-mods
git -C claude-mods checkout 0954c978c1101ebea60edee1331c8586a5d0ff6f
claude plugin validate claude-mods/plugins/context-keeper
claude --plugin-dir claude-mods/plugins/context-keeper

The validate line lists the events the mod hooks and what it asks Claude Code to do, without running it. The last line loads the mod for this session only and writes nothing to your settings. If the author has rewritten history, the commit may no longer exist.

Ask Claude about it

With the ModsCode connector added, Claude can read this mod's code and what it reaches, and build on them. Ask it like this:

Read the ModsCode mod "mishgoldenberg-context-keeper" with its code and make me one like it

Search them from Claude: the MCP connector

Similar mods

More from this repository

See all 12 mods in this repository

Badge for your README

If this is your mod, paste this into your README. It links to this page.

README.md
[![ModsCode](https://modscode.com/badge/mishgoldenberg-context-keeper.svg)](https://modscode.com/claude-mods/mods/mishgoldenberg-context-keeper/)