companion by MaryCache: Claude Code mod code

What it does

Draws a pane, a band above the prompt
Adds /board
Watches tool calls and can refuse them
Hooks prompt.submit, session.measure, session.start, skill.prompt and 1 more
Starts processes

Good points

No network calls
Written in TypeScript
Has a desktop-specific branch
Handles errors

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)

import type { Register } from 'claude-code'

// Drawn like companion by MaryCache (pane, band, toast), as ModsCode read it from the mod's code:
// https://modscode.com/claude-mods/mods/marycache-companion/
// 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 $.ui.open({ id: 'my-pane', title: "‹paneTitle›" })
  on('ui.render', { component: 'Pane', requestId: 'my-pane' }, async ($, e) => {
    const { Box, Text, Button } = $.ui.resolve(e)
    const label = '…'
    const label2 = '…'
    const label3 = '…'
    const usageHeading = '…'
    const usageEmpty = '…'
    const label4 = '…'
    const filled = '…'
    const part = '…'
    const percent = '…'
    const usageUntil = '…'
    const label5 = '…'
    const filled2 = '…'
    const part2 = '…'
    const label6 = '…'
    const filled3 = '…'
    const part3 = '…'
    const folderLabel = '…'
    const shortenHome = '…'
    const lookHeading = '…'
    const title = '…'
    const open = '…'
    const done = '…'
    const note = '…'
    const target = '…'
    const title2 = '…'
    const target2 = '…'
    const title3 = '…'
    const target3 = '…'
    const sectionInProgress = '…'
    const length = '…'
    const sectionEmpty = '…'
    const title4 = '…'
    const tags = '…'
    const title5 = '…'
    const tags2 = '…'
    const title6 = '…'
    const tags3 = '…'
    const sectionBlocked = '…'
    const length2 = '…'
    const sectionEmpty2 = '…'
    const title7 = '…'
    const tags4 = '…'
    const title8 = '…'
    const tags5 = '…'
    const title9 = '…'
    const tags6 = '…'
    const sectionReview = '…'
    const length3 = '…'
    const sectionEmpty3 = '…'
    const title10 = '…'
    const tags7 = '…'
    const title11 = '…'
    const tags8 = '…'
    const title12 = '…'
    const tags9 = '…'
    const readAt = '…'
    const reload = '…'
    return (
      <Box flexDirection="column">
        <Box flexDirection="column" flexGrow={1}>
          <Box flexDirection="column">
            <Box marginBottom={1}>
              <Box marginRight={1}>
                <Text bold color="#C8664A">
                  [
                  {label}
                  ]
                </Text>
              </Box>
              <Box marginRight={1}>
                <Text bold color="#C8664A">
                  [
                  {label2}
                  ]
                </Text>
              </Box>
              <Box marginRight={1}>
                <Text bold color="#C8664A">
                  [
                  {label3}
                  ]
                </Text>
              </Box>
            </Box>
            <Box flexDirection="column" marginBottom={1}>
              <Text bold color="#C8664A">
                {usageHeading}
              </Text>
              <Text dimColor>
                {usageEmpty}
              </Text>
              <Text wrap="truncate-end">
                {label4}
                {" "}
                <Text>
                  {filled}
                </Text>
                <Text backgroundColor="#4A4440">
                  {part}
                </Text>
                <Text color="#4A4440">
                  ████████
                </Text>
                {" "}
                {`${percent}%`}
                <Text dimColor>
                  {`  ${usageUntil}`}
                </Text>
              </Text>
              <Text wrap="truncate-end">
                {label5}
                {" "}
                <Text>
                  {filled2}
                </Text>
                <Text backgroundColor="#4A4440">
                  {part2}
                </Text>
                <Text color="#4A4440">
                  ████████
                </Text>
                {" "}
                {`${percent}%`}
                <Text dimColor>
                  {`  ${usageUntil}`}
                </Text>
              </Text>
              <Text wrap="truncate-end">
                {label6}
                {" "}
                <Text>
                  {filled3}
                </Text>
                <Text backgroundColor="#4A4440">
                  {part3}
                </Text>
                <Text color="#4A4440">
                  ████████
                </Text>
                {" "}
                {`${percent}%`}
                <Text dimColor>
                  {`  ${usageUntil}`}
                </Text>
              </Text>
            </Box>
            <Box marginBottom={1}>
              <Text dimColor>
                {folderLabel}
              </Text>
              <Button label={`${shortenHome}`} />
            </Box>
            <Box flexDirection="column" marginBottom={1}>
              <Text bold color="#C8664A">
                {lookHeading}
              </Text>
              <Box flexDirection="column">
                <Box>
                  <Text wrap="truncate-end">
                    ・
                    {title}
                    {" "}
                  </Text>
                  <Button label={`${open}`} />
                  <Text>
                    {" "}
                  </Text>
                  <Button label={`${done}`} />
                </Box>
                <Text dimColor wrap="truncate-start">
                  {"  "}
                  {`${note} · `}
                  {target}
                </Text>
              </Box>
              <Box flexDirection="column">
                <Box>
                  <Text wrap="truncate-end">
                    ・
                    {title2}
                    {" "}
                  </Text>
                  <Button label={`${open}`} />
                  <Text>
                    {" "}
                  </Text>
                  <Button label={`${done}`} />
                </Box>
                <Text dimColor wrap="truncate-start">
                  {"  "}
                  {`${note} · `}
                  {target2}
                </Text>
              </Box>
              <Box flexDirection="column">
                <Box>
                  <Text wrap="truncate-end">
                    ・
                    {title3}
                    {" "}
                  </Text>
                  <Button label={`${open}`} />
                  <Text>
                    {" "}
                  </Text>
                  <Button label={`${done}`} />
                </Box>
                <Text dimColor wrap="truncate-start">
                  {"  "}
                  {`${note} · `}
                  {target3}
                </Text>
              </Box>
            </Box>
            <Box flexDirection="column" marginBottom={1}>
              <Text bold color="#C8664A">
                {sectionInProgress}
                {" "}
                {length}
              </Text>
              <Text dimColor>
                {sectionEmpty}
              </Text>
              <Box flexDirection="column">
                <Text wrap="truncate-end">
                  ・
                  {title4}
                </Text>
                <Text dimColor wrap="truncate-end">
                  {"  "}
                  {tags}
                </Text>
              </Box>
              <Box flexDirection="column">
                <Text wrap="truncate-end">
                  ・
                  {title5}
                </Text>
                <Text dimColor wrap="truncate-end">
                  {"  "}
                  {tags2}
                </Text>
              </Box>
              <Box flexDirection="column">
                <Text wrap="truncate-end">
                  ・
                  {title6}
                </Text>
                <Text dimColor wrap="truncate-end">
                  {"  "}
                  {tags3}
                </Text>
              </Box>
            </Box>
            <Box flexDirection="column" marginBottom={1}>
              <Text bold color="#C8664A">
                {sectionBlocked}
                {" "}
                {length2}
              </Text>
              <Text dimColor>
                {sectionEmpty2}
              </Text>
              <Box flexDirection="column">
                <Text wrap="truncate-end">
                  ・
                  {title7}
                </Text>
                <Text dimColor wrap="truncate-end">
                  {"  "}
                  {tags4}
                </Text>
              </Box>
              <Box flexDirection="column">
                <Text wrap="truncate-end">
                  ・
                  {title8}
                </Text>
                <Text dimColor wrap="truncate-end">
                  {"  "}
                  {tags5}
                </Text>
              </Box>
              <Box flexDirection="column">
                <Text wrap="truncate-end">
                  ・
                  {title9}
                </Text>
                <Text dimColor wrap="truncate-end">
                  {"  "}
                  {tags6}
                </Text>
              </Box>
            </Box>
            <Box flexDirection="column" marginBottom={1}>
              <Text bold color="#C8664A">
                {sectionReview}
                {" "}
                {length3}
              </Text>
              <Text dimColor>
                {sectionEmpty3}
              </Text>
              <Box flexDirection="column">
                <Text wrap="truncate-end">
                  ・
                  {title10}
                </Text>
                <Text dimColor wrap="truncate-end">
                  {"  "}
                  {tags7}
                </Text>
              </Box>
              <Box flexDirection="column">
                <Text wrap="truncate-end">
                  ・
                  {title11}
                </Text>
                <Text dimColor wrap="truncate-end">
                  {"  "}
                  {tags8}
                </Text>
              </Box>
              <Box flexDirection="column">
                <Text wrap="truncate-end">
                  ・
                  {title12}
                </Text>
                <Text dimColor wrap="truncate-end">
                  {"  "}
                  {tags9}
                </Text>
              </Box>
            </Box>
            <Box>
              <Text dimColor>
                {readAt}
              </Text>
              <Button label={`${reload}`} />
            </Box>
          </Box>
        </Box>
      </Box>
    )
  })

  // 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 } = $.ui.resolve(e)
    const name = '…'
    const bandLine = '…'
    const bandCounts = '…'
    const bandBoardButton = '…'
    const bandHideButton = '…'
    return (
      <Box flexDirection="column">
        <Box>
          <Text color="#C8664A">
            {"◦ "}
            {name}
            {" "}
          </Text>
          <Text dimColor wrap="truncate-end">
            {bandLine}
            {bandCounts}
          </Text>
          <Button label={`${bandBoardButton}`} />
          <Text>
            {" "}
          </Text>
          <Button label={`${bandHideButton}`} />
        </Box>
        {await next(e)}
      </Box>
    )
  })
}

The mod's own code

Its licence text was not found at the commit read, so only the places in the source are linked.

How to build this: Pane (panel), Deny a tool call

What its code calls

runs programswrites filesenv varstool calls

What its code shows

Read from the source at commit d4ae7e0b20fc 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 read	Every module hooks/hooks.json names was read.plugins/companion/hooks/register.tsx
Parses	Every file parses as TypeScript or JavaScript.18 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.listed in its repository's .claude-plugin/marketplace.json: installs from there
Programs on Windows	Whether every program it starts through $.process exists on Windows (tail, date, open, osascript, /usr/… do not).plugins/companion/hooks/register.tsx:116 mv (not on Windows); plugins/companion/hooks/register.tsx:122 rm (not on Windows); plugins/companion/hooks/register.tsx:184 which (not on Windows); plugins/companion/hooks/register.tsx:241 uname (not on Windows)
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.plugins/companion/hooks/register.tsx:269 a program named at run time
Reads and sends	Whether it both reads something of yours (files, environment variables, the transcript, settings) and reaches outside (the network, an MCP server, another session, telemetry).reads environment variables, files, the transcript, but reaches nothing outside
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.no licence
Settings hooks	Hooks 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 ships	MCP 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, agents	What 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 MCP	Whether 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 $.process).calls no tool, MCP server or command
Asks of the model	Completions it runs ($.model.complete, fork, classify), subagents it spawns, prompts it submits as you, and the tools, commands and agents it adds.adds command board, adds tool ask_to_look
Events it hooks	By 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 (board), prompt.submit, tool.call · shapes: skill.prompt · also: session.start, session.measure, turn.complete, ui.render (Pane, AbovePrompt) · timers: clock.every
Reads, by name	The environment variables and files it names, and whether it reads the transcript, settings.json, the prompt box or the mouse selection.env: HOME, CLAUDE_CONFIG_DIR, LC_ALL, LC_MESSAGES, LANG (+1); files: a path computed at run time; the transcript
Writes, by name	The 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: ….….tmp, a path computed at run time; the clipboard

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 MaryCache/claude-code-companion-mod

/plugin install companion@claude-code-companion-mod

/reload-plugins

This installs the marketplace's latest commit, which may not be the one read here (d4ae7e0b20fc). 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/MaryCache/claude-code-companion-mod

git -C claude-code-companion-mod checkout d4ae7e0b20fc8331069ae95e8ef5588f863c2957

claude plugin validate claude-code-companion-mod/plugins/companion

claude --plugin-dir claude-code-companion-mod/plugins/companion

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 "marycache-companion" with its code and make me one like it

Search them from Claude: the MCP connector

Similar mods

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/marycache-companion.svg)](https://modscode.com/claude-mods/mods/marycache-companion/)