dbx-trace by mattromano: Claude Code mod code

What it does

Draws a band above the prompt, a pane
Adds /dbx-trace
Watches tool calls
Hooks classic.PreToolUse, session.end, session.start, turn.complete and 1 more
Keeps its own state between turns

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 dbx-trace by Matt Romano (pane, band), as ModsCode read it from the mod's code:
// https://modscode.com/claude-mods/mods/mattromano-dbx-trace/
// 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 } = $.ui.resolve(e)
    const actions = '…'
    const failed = '…'
    const blocked = '…'
    const prodWrites = '…'
    const formatBytes = '…'
    const glyph = '…'
    const head = '…'
    const preview = '…'
    const tableText = '…'
    const glyph2 = '…'
    const tableText2 = '…'
    const glyph3 = '…'
    const tableText3 = '…'
    const length = '…'
    const error = '…'
    return (
      <Box flexDirection="column">
        <Box flexDirection="column">
          <Box flexDirection="row" gap={1}>
            <Text>
              <Text bold>
                Databricks
              </Text>
              <Text dimColor>
                {" "}
                {"· "}
                {actions}
                {" action"}
              </Text>
              <Text color="error">
                {" · "}
                {failed}
                {" failed"}
              </Text>
              <Text color="warning">
                {" · "}
                {blocked}
                {" blocked"}
              </Text>
              <Text color="error" bold>
                {" "}
                {"· "}
                {prodWrites}
                {" PROD WRITE"}
              </Text>
              <Text dimColor>
                {" · "}
                {formatBytes}
                {" read"}
              </Text>
            </Text>
            <Button hotkey="p">
              Panel
            </Button>
            <Button hotkey="o" dimColor>
              Page
            </Button>
            <Button hotkey="m" dimColor>
              Minimize
            </Button>
          </Box>
          <Box flexDirection="row">
            <Text>
              {glyph}
              {" "}
            </Text>
            <Button plain label={`${head}${preview}`} />
            <Text>
              {" "}
              {tableText}
            </Text>
          </Box>
          <Box flexDirection="row">
            <Text>
              {glyph2}
              {" "}
            </Text>
            <Button plain label={`${head}${preview}`} />
            <Text>
              {" "}
              {tableText2}
            </Text>
          </Box>
          <Box flexDirection="row">
            <Text>
              {glyph3}
              {" "}
            </Text>
            <Button plain label={`${head}${preview}`} />
            <Text>
              {" "}
              {tableText3}
            </Text>
          </Box>
          <Text dimColor>
            {"… "}
            {length}
            {" earlier in the panel"}
          </Text>
          <Text color="warning" wrap="truncate-end">
            {"query history: "}
            {error}
          </Text>
          <Text dimColor>
            ctrl+x tab to focus · Enter opens an action · p panel · o page · m minimize
          </Text>
        </Box>
        {await next(e)}
      </Box>
    )
  })

  // the pane: open it with $.ui.open({ id: 'my-pane', title: "Databricks trace" })
  on('ui.render', { component: 'Pane', requestId: 'my-pane' }, async ($, e) => {
    const { Box, Text, Button, Link } = $.ui.resolve(e)
    const actions = '…'
    const queries = '…'
    const failed = '…'
    const blocked = '…'
    const prodWrites = '…'
    const formatBytes = '…'
    const formatDuration = '…'
    const sessionId = '…'
    const branch = '…'
    const text = '…'
    const value = '…'
    const glyph = '…'
    const head = '…'
    const preview = '…'
    const glyph2 = '…'
    const glyph3 = '…'
    const catalog = '…'
    const href = '…'
    const short = '…'
    const reads = '…'
    const writes = '…'
    const catalog2 = '…'
    const short2 = '…'
    const catalog3 = '…'
    const short3 = '…'
    const catalog4 = '…'
    const short4 = '…'
    const catalog5 = '…'
    const short5 = '…'
    const catalog6 = '…'
    const short6 = '…'
    const catalog7 = '…'
    const short7 = '…'
    const catalog8 = '…'
    const short8 = '…'
    const catalog9 = '…'
    const short9 = '…'
    return (
      <Box flexDirection="column">
        <Text wrap="truncate-end">
          <Text bold>
            Databricks
          </Text>
          <Text dimColor>
            {" "}
            {"· "}
            {actions}
            {" action"}
            {" · "}
            {queries}
            {" quer"}
            y
          </Text>
          <Text color="error">
            {" · "}
            {failed}
            {" failed"}
          </Text>
          <Text color="warning">
            {" · "}
            {blocked}
            {" blocked"}
          </Text>
          <Text color="error" bold>
            {" "}
            {"· "}
            {prodWrites}
            {" PROD WRITE"}
          </Text>
          <Text dimColor>
            {" · "}
            {formatBytes}
            {" read"}
          </Text>
          <Text dimColor>
            {" · "}
            {formatDuration}
            {" server"}
          </Text>
        </Text>
        <Box flexDirection="row" gap={1}>
          <Text wrap="truncate-end">
            {"session "}
            {sessionId}
            {` · ${branch}`}
            {" · "}
            {text}
          </Text>
          <Button hotkey="r" dimColor>
            Refresh
          </Button>
          <Button hotkey="o" dimColor>
            Page
          </Button>
        </Box>
        <Text>
          <Text color="inactive">
            {"■ read "}
          </Text>
          <Text color="success">
            {"■ write "}
          </Text>
          <Text>
            {"■ prod write "}
          </Text>
          <Text color="suggestion">
            {"■ script "}
          </Text>
          <Text color="error">
            {"■ failed "}
          </Text>
          <Text color="warning">
            ■ blocked
          </Text>
        </Text>
        <Text bold>
          Guardrails
        </Text>
        <Button plain label={`${value}`} />
        <Button plain label={`${value}`} />
        <Button plain label={`${value}`} />
        <Text>
          <Text bold>
            Actions
          </Text>
          <Text dimColor>
            {" newest first · "}
            time · client · server · read
          </Text>
        </Text>
        <Box flexDirection="row">
          <Text>
            {glyph}
            {" "}
          </Text>
          <Button plain label={`${head}${preview}`} />
        </Box>
        <Box flexDirection="row">
          <Text>
            {glyph2}
            {" "}
          </Text>
          <Button plain label={`${head}${preview}`} />
        </Box>
        <Box flexDirection="row">
          <Text>
            {glyph3}
            {" "}
          </Text>
          <Button plain label={`${head}${preview}`} />
        </Box>
        <Text bold>
          Tables touched
        </Text>
        <Text>
          <Text color="error" bold>
            {catalog}
          </Text>
          <Text>
            {" ✎ "}
          </Text>
          <Link href={`${href}`}>
            <Text>
              {short}
            </Text>
          </Link>
          <Text dimColor>
            {` read ×${reads}`}
            {` written ×${writes}`}
          </Text>
        </Text>
        <Text>
          <Text color="error" bold>
            {catalog2}
          </Text>
          <Text>
            {" ✎ "}
          </Text>
          <Link href={`${href}`}>
            <Text>
              {short2}
            </Text>
          </Link>
          <Text dimColor>
            {` read ×${reads}`}
            {` written ×${writes}`}
          </Text>
        </Text>
        <Text>
          <Text color="error" bold>
            {catalog3}
          </Text>
          <Text>
            {" ✎ "}
          </Text>
          <Link href={`${href}`}>
            <Text>
              {short3}
            </Text>
          </Link>
          <Text dimColor>
            {` read ×${reads}`}
            {` written ×${writes}`}
          </Text>
        </Text>
        <Text>
          <Text color="error" bold>
            {catalog4}
          </Text>
          <Text>
            {" ✎ "}
          </Text>
          <Link href={`${href}`}>
            <Text>
              {short4}
            </Text>
          </Link>
          <Text dimColor>
            {` read ×${reads}`}
            {` written ×${writes}`}
          </Text>
        </Text>
        <Text>
          <Text color="error" bold>
            {catalog5}
          </Text>
          <Text>
            {" ✎ "}
          </Text>
          <Link href={`${href}`}>
            <Text>
              {short5}
            </Text>
          </Link>
          <Text dimColor>
            {` read ×${reads}`}
            {` written ×${writes}`}
          </Text>
        </Text>
        <Text>
          <Text color="error" bold>
            {catalog6}
          </Text>
          <Text>
            {" ✎ "}
          </Text>
          <Link href={`${href}`}>
            <Text>
              {short6}
            </Text>
          </Link>
          <Text dimColor>
            {` read ×${reads}`}
            {` written ×${writes}`}
          </Text>
        </Text>
        <Text>
          <Text color="error" bold>
            {catalog7}
          </Text>
          <Text>
            {" ✎ "}
          </Text>
          <Link href={`${href}`}>
            <Text>
              {short7}
            </Text>
          </Link>
          <Text dimColor>
            {` read ×${reads}`}
            {` written ×${writes}`}
          </Text>
        </Text>
        <Text>
          <Text color="error" bold>
            {catalog8}
          </Text>
          <Text>
            {" ✎ "}
          </Text>
          <Link href={`${href}`}>
            <Text>
              {short8}
            </Text>
          </Link>
          <Text dimColor>
            {` read ×${reads}`}
            {` written ×${writes}`}
          </Text>
        </Text>
        <Text>
          <Text color="error" bold>
            {catalog9}
          </Text>
          <Text>
            {" ✎ "}
          </Text>
          <Link href={`${href}`}>
            <Text>
              {short9}
            </Text>
          </Link>
          <Text dimColor>
            {` read ×${reads}`}
            {` written ×${writes}`}
          </Text>
        </Text>
        <Text dimColor>
          ctrl+x tab to focus · ↑↓ Enter open an action · r refresh history · o page
        </Text>
      </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 callsrememberscalls tools

What its code shows

Read from the source at commit 42328568645c 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.dbx-trace/hooks/register.tsx
Parses	Every file parses as TypeScript or JavaScript.7 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).runs no program a Windows PC lacks
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.dbx-trace/hooks/register.tsx:255 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 and reaches the network, an MCP server
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 $.process).dbx-trace/hooks/register.tsx:171 an MCP tool named at run time; dbx-trace/hooks/register.tsx:175 a tool named at run time
Asks of the model	Completions it runs ($.model.complete, fork, classify), subagents it spawns, prompts it submits as you, and the tools, commands and agents it adds.adds command dbx-trace
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: classic.PreToolUse, tool.call, command.run (dbx-trace) · also: session.start, turn.complete, session.end, ui.close (+1) · timers: clock.after
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: OS, HOME; files: a path computed at run time
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: a path computed at run time

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 mattromano/claude-modz

/plugin install dbx-trace@claude-modz

/reload-plugins

This installs the marketplace's latest commit, which may not be the one read here (42328568645c). 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/mattromano/claude-modz

git -C claude-modz checkout 42328568645c3b3098a15b8873eb299af278bd35

claude plugin validate claude-modz/dbx-trace

claude --plugin-dir claude-modz/dbx-trace

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 "mattromano-dbx-trace" with its code and make me one like it

Search them from Claude: the MCP connector

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README.md

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