tap
Tap: a live recorder on the hook chain, with a secret guard
What it does
- Draws a pane, a band above the prompt
- Adds /tap
- Watches tool calls
- Hooks prompt.submit, session.append, session.start, turn.complete
Good points
- No network calls
- Starts no processes
- Small: 263 lines
- Written in TypeScript
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)
import type { Register } from 'claude-code'
// Drawn like tap by gfsaaser24 (pane, band), as modscode read it from the mod's code:
// https://modscode.com/gallery/gfsaaser24-tap/
// 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 $.ui.open({ id: 'my-pane', title: "Tap" })
on('ui.render', { component: 'Pane', requestId: 'my-pane' }, async ($, e) => {
const { Box, Markdown, Text, Svg, Button } = $.ui.resolve(e)
const turns = '…'
const toolCalls = '…'
const errors = '…'
const rows = '…'
const contextBar = '…'
const ctxPct = '…'
const ms = '…'
const costUsd = '…'
const outTok = '…'
const cacheRead = '…'
const durationChart = '…'
const at = '…'
const tool = '…'
const ms2 = '…'
const at2 = '…'
const tool2 = '…'
const ms3 = '…'
const at3 = '…'
const tool3 = '…'
const ms4 = '…'
const map = '…'
const secretsSeen = '…'
const redacted = '…'
return (
<Box flexDirection="column" gap={1}>
<Markdown text="**Tap** shows the *translation layer*. It sits on the hook chain and sees each thing that crosses the wall: every tool …" />
<Box flexDirection="row" columnGap={2} flexWrap="wrap">
<Text>
<Text bold>
{turns}
</Text>
{" "}
<Text dimColor>
turns
</Text>
</Text>
<Text>
<Text bold>
{toolCalls}
</Text>
{" "}
<Text dimColor>
tool calls
</Text>
</Text>
<Text>
<Text bold color="error">
{errors}
</Text>
{" "}
<Text dimColor>
errors
</Text>
</Text>
<Text>
<Text bold>
{rows}
</Text>
{" "}
<Text dimColor>
transcript rows
</Text>
</Text>
</Box>
<Svg source={`${contextBar}`} alt={`Context window ${ctxPct} percent full`} width={340} height={30} />
<Box borderStyle="round" borderColor="suggestion" paddingX={1} flexDirection="column">
<Text>
<Text bold>
Last turn
</Text>
{" "}
{ms}
{" s"}
<Text dimColor>
{" / session cost $"}
{costUsd}
</Text>
</Text>
<Text dimColor>
{outTok}
{" tokens out / "}
{cacheRead}
{" read from cache"}
</Text>
</Box>
<Svg source={`${durationChart}`} alt="Bar chart of tool call time" width={340} height={78} />
<Box flexDirection="column">
<Text bold>
Tool calls
</Text>
<Text dimColor>
None yet.
</Text>
<Text wrap="truncate-end">
<Text dimColor>
{at}
</Text>
{" "}
<Text>
●
</Text>
{" "}
{tool}
{" "}
<Text dimColor>
{ms2}
{" ms"}
</Text>
</Text>
<Text wrap="truncate-end">
<Text dimColor>
{at2}
</Text>
{" "}
<Text>
●
</Text>
{" "}
{tool2}
{" "}
<Text dimColor>
{ms3}
{" ms"}
</Text>
</Text>
<Text wrap="truncate-end">
<Text dimColor>
{at3}
</Text>
{" "}
<Text>
●
</Text>
{" "}
{tool3}
{" "}
<Text dimColor>
{ms4}
{" ms"}
</Text>
</Text>
</Box>
<Box flexDirection="column">
<Text bold>
Transcript rows, by door
</Text>
<Text dimColor wrap="wrap">
{map}
</Text>
</Box>
<Box borderStyle="round" borderColor="success" paddingX={1} flexDirection="column">
<Text>
<Text bold>
Secret guard
</Text>
{" is "}
<Text color="success">
on
</Text>
</Text>
<Text dimColor>
{secretsSeen}
{" keys seen in tool results / "}
{redacted}
{" hidden from the model"}
</Text>
<Button variant="secondary" label="Turn guard off" />
</Box>
<Text dimColor>
How: hooks on tool.call, turn.complete and session.append. Each one calls next(e).
</Text>
</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 parts = '…'
return (
<Box flexDirection="column">
<Box columnGap={1}>
<Text dimColor>
{parts}
</Text>
<Button label="Tap" />
</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.
What its code calls
tool calls
The design, read from code
Drawn from the mod's source at the commit read, not from a run: a list is drawn three times, a condition takes its first branch that draws in the desktop app, and a value only the run time knows is shown as a made-up sample (dotted underline) or left out. Colours and type are this site's.
What its code shows
Read from the source at commit a59bbddc296e 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 read | Every module hooks/hooks.json names was read.tap/hooks/register.tsx |
| Parses | Every file parses as TypeScript or JavaScript.1 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.its repository's .claude-plugin/marketplace.json does not list it: no install line to give |
| 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.starts no programs |
| Reads and sends | Whether it both reads files or environment variables and reaches the network.reaches no network |
| 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 |
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's .claude-plugin/marketplace.json does not list it, so there is no install line to give. Read it as code, or follow its author's README.
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 "gfsaaser24-tap" with its code and make me a pane like itSearch them from Claude: the MCP connector
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