check-it
A list of the things to look at with your own eyes after Claude changes something you can see, each with a link and a tick.
What it does
- Draws a band above the prompt, a pane, toasts
- Adds /check-it
- Watches tool calls and can refuse them
- Hooks prompt.compose, session.start, turn.complete
- 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
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 check-it by David Eiffert (pane, band, toast), as modscode read it from the mod's code:
// https://modscode.com/gallery/davideiffert-check-it/
// 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 leftLine = '…'
return (
<Box flexDirection="column">
<Box flexDirection="row" flexWrap="wrap" columnGap={1}>
<Text>
{leftLine}
</Text>
<Button label="open list" />
<Button label="ask what to check" />
</Box>
{await next(e)}
</Box>
)
})
// the pane: open it with $.ui.open({ id: 'my-pane', title: "Check it" })
on('ui.render', { component: 'Pane', requestId: 'my-pane' }, async ($, e) => {
const { Box, Text, Button } = $.ui.resolve(e)
const label = '…'
const expect = '…'
const PLACE_WORDS = '…'
const where = '…'
const label2 = '…'
const expect2 = '…'
const PLACE_WORDS2 = '…'
const where2 = '…'
const label3 = '…'
const expect3 = '…'
const PLACE_WORDS3 = '…'
const where3 = '…'
const length = '…'
const label4 = '…'
const label5 = '…'
const label6 = '…'
return (
<Box flexDirection="column" rowGap={1}>
<Text dimColor>
Nothing left to look at. New items appear when Claude changes a page you can see.
</Text>
<Box flexDirection="column">
<Text bold>
{label}
</Text>
<Text>
{expect}
</Text>
<Box flexDirection="row" columnGap={1}>
<Text dimColor>
{PLACE_WORDS}
</Text>
<Text dimColor wrap="truncate-end">
{where}
</Text>
</Box>
<Box flexDirection="row" flexWrap="wrap" columnGap={1}>
<Button label="checked" />
<Button label="not right" />
<Button label="dismiss" dimColor />
</Box>
</Box>
<Box flexDirection="column">
<Text bold>
{label2}
</Text>
<Text>
{expect2}
</Text>
<Box flexDirection="row" columnGap={1}>
<Text dimColor>
{PLACE_WORDS2}
</Text>
<Text dimColor wrap="truncate-end">
{where2}
</Text>
</Box>
<Box flexDirection="row" flexWrap="wrap" columnGap={1}>
<Button label="checked" />
<Button label="not right" />
<Button label="dismiss" dimColor />
</Box>
</Box>
<Box flexDirection="column">
<Text bold>
{label3}
</Text>
<Text>
{expect3}
</Text>
<Box flexDirection="row" columnGap={1}>
<Text dimColor>
{PLACE_WORDS3}
</Text>
<Text dimColor wrap="truncate-end">
{where3}
</Text>
</Box>
<Box flexDirection="row" flexWrap="wrap" columnGap={1}>
<Button label="checked" />
<Button label="not right" />
<Button label="dismiss" dimColor />
</Box>
</Box>
<Box flexDirection="column">
<Button plain dimColor label={`v checked (${length})`} />
<Box flexDirection="row" columnGap={1}>
<Text dimColor wrap="truncate-end">
{label4}
</Text>
<Button label="undo" dimColor />
</Box>
<Box flexDirection="row" columnGap={1}>
<Text dimColor wrap="truncate-end">
{label5}
</Text>
<Button label="undo" dimColor />
</Box>
<Box flexDirection="row" columnGap={1}>
<Text dimColor wrap="truncate-end">
{label6}
</Text>
<Button label="undo" dimColor />
</Box>
</Box>
<Button label="ask what to check" dimColor />
</Box>
)
})
on('session.start', async ($, e, next) => {
const href = '…'
await $.ui.toast(`Could not open the browser. The page is at ${href}`)
return next(e)
})
}
The mod's own code
Shown under the mod's licence (MIT); its text is below. Keep the notice if you copy these lines.
hooks/register.tsx lines 206–217 · Band
on('ui.render', { component: 'AbovePrompt' }, async ($, e, next) => {
const p = await read($, shown)
if (e.props.hasSurvey || !p.ever) return next(e)
const { Box, Button, Text } = $.ui.resolve(e)
return (
<Box flexDirection="row" flexWrap="wrap" columnGap={1}>
<Text>{leftLine(p)}</Text>
<Button key="open" label="open list" onPress={() => openPane($)} />
<Button key="ask" label="ask what to check" onPress={() => appendToPrompt($, ASK_TEXT)} />
</Box>
)
})hooks/register.tsx lines 219–282 · Pane
on('ui.render', { component: 'Pane', requestId: PANE }, async ($, e) => {
const { Box, Button, Link, Text } = $.ui.resolve(e)
const p = await read($, shown)
// Every press acts on the project this list belongs to, even after a change of directory.
const root = p.root
const isShowingChecked = await read($, showChecked)
const open = p.items.filter(one => one.status === 'open').reverse()
const checked = p.items.filter(one => one.status === 'checked').reverse()
const whereOf = (item: Item) => {
// The terminal button opens any http(s) page; a Link elsewhere takes only what safeHref passes.
const href = e.surface === 'terminal' ? openableHref(item.where) : safeHref(item.where)
if (href === undefined) return <Text dimColor wrap="truncate-end">{item.where}</Text>
return e.surface === 'terminal'
? <Button key={`open:${item.id}`} label="open link" onPress={() => openInBrowser($, href)} />
: <Link href={href} label="open link" />
}
return (
<Box flexDirection="column" rowGap={1}>
<Text dimColor>
{open.length === 0 ? 'Nothing left to look at. New items appear when Claude changes a page you can see.' : `${open.length} to look at. Claude says:`}
</Text>
{open.map(item => (
<Box key={`item:${item.id}`} flexDirection="column">
<Text bold>{item.label}</Text>
{item.expect !== '' && <Text>{item.expect}</Text>}
<Box flexDirection="row" columnGap={1}>
<Text dimColor>{PLACE_WORDS[item.place]}</Text>
{whereOf(item)}
</Box>
<Box flexDirection="row" flexWrap="wrap" columnGap={1}>
<Button key={`check:${item.id}`} label="checked" onPress={() => change($, root, q => setStatus(q, item.id, 'checked'))} />
<Button
key={`bad:${item.id}`}
label="not right"
onPress={() => appendToPrompt($, notRightText(item))}
/>
<Button key={`dismiss:${item.id}`} label="dismiss" dimColor onPress={() => change($, root, q => dismiss(q, item.id))} />
</Box>
</Box>
))}
{checked.length > 0 && (
<Box key="checked" flexDirection="column">
<Button
key="toggle-checked"
plain
dimColor
label={`${isShowingChecked ? 'v' : '>'} checked (${checked.length})`}
onPress={() => update($, showChecked, shown => !shown)}
/>
{isShowingChecked &&
checked.map(item => (
<Box key={`done:${item.id}`} flexDirection="row" columnGap={1}>
<Text dimColor wrap="truncate-end">{item.label}</Text>
<Button key={`undo:${item.id}`} label="undo" dimColor onPress={() => change($, root, q => setStatus(q, item.id, 'open'))} />
</Box>
))}
</Box>
)}
<Button key="ask" label="ask what to check" dimColor onPress={() => appendToPrompt($, ASK_TEXT)} />
</Box>
)
})Licence text (MIT)
MIT License Copyright (c) 2026 David Eiffert 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 programstool callsremembers
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 03c0c467c291 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.hooks/register.tsx |
| Parses | Every file parses as TypeScript or JavaScript.2 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.hooks/register.tsx:126 a program named at run time |
| 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.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 davideiffert/check-it/plugin install check-it@check-itThis installs the marketplace's latest commit, which may not be the one read here (03c0c467c291). 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 "davideiffert-check-it" with its code and make me a pane like itSearch them from Claude: the MCP connector
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What it does
- Draws a band above the prompt, a pane
- Watches tool calls and can refuse them
- Hooks config.describe, session.start, turn.complete, ui.close
- Keeps its own state between turns
-
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