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codex-panel

A live Codex session in a side panel: chat with it, pick model, effort and access; Claude and Codex message each other (the codex tool, @claude:), and Codex sees Claude's prompts, tool calls, replies and transcript.

Code you can checkTerminal + desktopPaneBox

What it does

  • Draws a pane
  • Adds /codex
  • Watches mcp__codex-panel__codex calls and can refuse them
  • Hooks session.start, turn.complete, turn.start
  • Keeps its own state between turns

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 codex-panel by Sai Rudra (pane), as modscode read it from the mod's code:
// https://modscode.com/gallery/saiharsha03-codex-panel/
// 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 $.ui.open({ id: 'my-pane', title: "Codex" })
  on('ui.render', { component: 'Pane', requestId: 'my-pane' }, async ($, e) => {
    const { Box } = $.ui.resolve(e)
    return (
      <Box flexDirection="column" />
    )
  })
}

The mod's own code

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

hooks/register.tsx lines 541–700 · Pane
  on('ui.render', { component: 'Pane', requestId: PANE }, async ($, e) => {
    const { Box, Text, Button, Input, Select } = $.ui.resolve(e)
    const props = (e as any).props ?? {}
    const cols = Math.max(20, Number(props.bodyColumns) || WIDTH)
    const height = Math.max(12, Number(props.scroll?.bodyRows) || 40)
    const linesOf = (t: string, pad = 0) => t.split('\n').reduce((n, l) => n + Math.max(1, Math.ceil((l.length + pad) / cols)), 0)
    const now = await $.clock.now()
    const spin = SPIN[Math.floor(now / 120) % SPIN.length]
    const full = cwd || root
    const where = full.split('/').pop() || 'this folder'
    const yolo = sandbox === 'danger-full-access'
    const cap = (s: string) => s.charAt(0).toUpperCase() + s.slice(1)
    const summary = `${cap(model)} · ${cap(effort)} · ${cap(SANDBOXES.find(s => s.value === sandbox)?.label ?? sandbox)}`
    const top: any[] = []
    const bottom: any[] = []
    let used = 0

    // header: name and state, the folder (press for the full path), the week
    const state =
      setup === 'checking' ? { dot: spin, label: 'checking', color: 'gray' }
      : setup === 'missing' ? { dot: '○', label: 'not installed', color: 'yellow' }
      : setup === 'signed-out' ? { dot: '○', label: 'signed out', color: 'yellow' }
      : busy ? { dot: spin, label: 'working', color: 'cyan' }
      : { dot: '●', label: 'ready', color: 'green' }
    top.push(
      <Box flexDirection="row" justifyContent="space-between">
        <Text bold>{'◆ Codex'}</Text>
        <Text color={state.color}>{`${state.dot} ${state.label}`}</Text>
      </Box>,
      <Button key="folder" plain dimColor label={`${showPath ? '▾' : '▸'} in ${where}`} onPress={() => { showPath = !showPath; $.ui.invalidate('ui.render') }} />,
    )
    used += 2
    if (showPath) {
      top.push(<Text dimColor wrap="wrap">{full}</Text>)
      used += linesOf(full)
    }
    if (limit) {
      const left = Math.max(0, Math.round(100 - limit.pct))
      const reset = new Date(limit.resetsAt)
      const cells = Math.round((left / 100) * 12)
      top.push(
        <Text wrap="truncate-end">
          <Text dimColor>{'week '}</Text>
          <Text color={left < 20 ? 'red' : left < 40 ? 'yellow' : 'green'}>{'━'.repeat(cells)}</Text>
          <Text dimColor>{'━'.repeat(12 - cells)}</Text>
          <Text dimColor>{` ${left}% left · resets ${MONTHS[reset.getMonth()]} ${reset.getDate()}`}</Text>
        </Text>,
      )
      used += 1
    }
    if (yolo) {
      top.push(
        <Box marginTop={1} paddingX={1} backgroundColor="red">
          <Text bold color="white" wrap="wrap">{'⚠ YOLO: Codex runs with no sandbox'}</Text>
        </Box>,
      )
      used += 2
    }

    // setup: what is missing and how to fix it
    if (setup === 'missing' || setup === 'signed-out') {
      top.push(
        <Box flexDirection="column" marginTop={1} paddingX={1} borderStyle="round" borderColor="yellow">
          {setup === 'missing' ? (
            <Box flexDirection="column">
              <Text bold color="yellow">{'⚠ Codex CLI not found'}</Text>
              <Text wrap="wrap">{'Install it, then press Check again:'}</Text>
              <Text color="cyan">{'npm i -g @openai/codex'}</Text>
              <Text dimColor wrap="wrap">{'or the Codex app from openai.com/codex'}</Text>
            </Box>
          ) : (
            <Box flexDirection="column">
              <Text bold color="yellow">{'⚠ Codex is not signed in'}</Text>
              <Text wrap="wrap">{'Sign in opens the browser for your ChatGPT account. For an API key, run in a terminal:'}</Text>
              <Text color="cyan" wrap="wrap">{'printenv OPENAI_API_KEY | codex login --with-api-key'}</Text>
            </Box>
          )}
          {signInNote ? <Text color={signingIn ? 'cyan' : 'yellow'} wrap="wrap">{signingIn ? `${spin} ${signInNote}` : signInNote}</Text> : null}
          <Box flexDirection="row" gap={1} marginTop={1}>
            {setup === 'signed-out' ? <Button key="sign-in" variant="primary" label={signingIn ? 'Signing in…' : '→ Sign in'} onPress={() => void signIn($)} /> : null}
            <Button key="recheck" label="↻ Check again" onPress={() => void checkSetup($)} />
          </Box>
        </Box>,
      )
      used += 11
    }

    // bottom: working line, the queue, the composer, actions, settings
    if (busy) {
      bottom.push(<Text color="cyan">{`  ${spin} Codex is thinking…`}</Text>)
      used += 1
    }
    queue.forEach((q, i) => {
      const label = `◷ Queued${q.from === 'claude' ? ' from Claude' : ''} · ${q.text}`
      bottom.push(
        <Box flexDirection="row" columnGap={1}>
          <Box flexShrink={1}>
            <Text dimColor wrap="truncate-end">{label}</Text>
          </Box>
          <Button key={`unqueue:${i}`} plain label="✕" onPress={() => unqueue($, q)} />
        </Box>,
      )
      used += 1
    })
    const lastCodex = [...log].reverse().find(r => r.who === 'codex')
    const long = draft.length > cols - 6
    if (long) {
      bottom.push(
        <Box marginTop={1} paddingX={1}>
          <Text wrap="wrap" dimColor>{draft}</Text>
        </Box>,
      )
      used += 1 + linesOf(draft, 2)
    }
    bottom.push(
      <Box marginTop={long ? 0 : 1} paddingX={1} borderStyle="round" borderColor={busy ? 'gray' : 'cyan'}>
        <Input
          key="input"
          autoFocus
          value={draft}
          placeholder={busy ? 'Codex is working… Enter queues' : 'Message Codex'}
          submitLabel={busy ? 'queue' : 'send'}
          onInput={(v: string) => {
            draft = v
            $.ui.invalidate('ui.render')
          }}
          onSubmit={(v: string) => {
            draft = ''
            void send($, v)
          }}
        />
      </Box>,
      <Box flexDirection="row" flexWrap="wrap" columnGap={1}>
        {busy && draft.trim() ? <Button key="interrupt" variant="primary" label="⚡ Interrupt & send" onPress={() => interrupt($, draft)} /> : null}
        {busy ? <Button key="stop" label="■ Stop" onPress={() => stop($)} /> : null}
        {lastCodex && !busy ? <Button key="to-claude" label="✻ Send to Claude" onPress={() => toClaude($, lastCodex.text)} /> : null}
        <Button key="new" label="+ New chat" onPress={() => fresh($)} />
        <Button key="close" label="✕" onPress={() => void $.ui.close({ id: PANE })} />
      </Box>,
      <Button key="settings" plain dimColor label={`${showSettings ? '▾' : '▸'} ⚙ ${summary}`} onPress={() => { showSettings = !showSettings; $.ui.invalidate('ui.render') }} />,
    )
    used += 6
    if (showSettings) {
      bottom.push(
        <Box flexDirection="column" paddingLeft={2}>
          <Select key="model" label="Model   " options={models.map(m => ({ value: m }))} value={model} onSelect={pick($, 'model', v => (model = v))} />
          <Select key="effort" label="Effort  " options={EFFORTS.map(v => ({ value: v }))} value={effort} onSelect={pick($, 'effort', v => (effort = v))} />
          <Select key="sandbox" label="Access  " options={SANDBOXES} value={sandbox} onSelect={pick($, 'sandbox', v => (sandbox = v))} />
          {thread ? <Text dimColor wrap="truncate-end">{`thread ${thread}`}</Text> : null}
        </Box>,
      )
      used += thread ? 4 : 3
    }

    // the conversation: newest first until the rows run out
    const chat: any[] = []
    if (!log.length && setup === 'ready')
      chat.push(
        <Box flexDirection="column" marginTop={1}>
          <Text dimColor wrap="wrap">{`Ask Codex anything. It works in ${where} and sees what Claude does.`}</Text>
Licence text (MIT)
MIT License

Copyright (c) 2026 Sai Rudra

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 varsdrives Claudetool callsremembers

What its code shows

Read from the source at commit 4ad2a424396f 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.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.hooks/register.tsx:121 bash (a shell or interpreter); hooks/register.tsx:144 a program named at run time; hooks/register.tsx:147 a program named at run time; hooks/register.tsx:170 a program named at run time; hooks/register.tsx:296 a program named at run time
Reads and sendsWhether it both reads files or environment variables and reaches the network.reads environment variables and files and reaches the 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 saiharsha03/codex-panel
/plugin install codex-panel@codex-panel

This installs the marketplace's latest commit, which may not be the one read here (4ad2a424396f). 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 "saiharsha03-codex-panel" with its code and make me a pane like it

Search them from Claude: the MCP connector

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