buddy
Buddy is back: the retired /buddy terminal companion as a Claude Code mod, with new sprites and Haiku writing its lines.
What it does
- Draws a band above the prompt
- Adds /buddy
- Watches tool calls and can refuse them
- Hooks prompt.compose, prompt.submit, session.start, turn.complete
- 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)
import type { Register } from 'claude-code'
// Drawn like buddy by polus-1 (band), as modscode read it from the mod's code:
// https://modscode.com/gallery/polus-1-buddy/
// 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 } = $.ui.resolve(e)
const text = '…'
const text2 = '…'
const text3 = '…'
const text4 = '…'
const text5 = '…'
const text6 = '…'
const text7 = '…'
const text8 = '…'
const text9 = '…'
const bubble = '…'
return (
<Box flexDirection="column">
<Box flexDirection="row" alignItems="center">
<Box flexDirection="column" width={12} flexShrink={0}>
<Box flexDirection="row">
<Text wrap="truncate">
{text}
</Text>
<Text wrap="truncate">
{text2}
</Text>
<Text wrap="truncate">
{text3}
</Text>
</Box>
<Box flexDirection="row">
<Text wrap="truncate">
{text4}
</Text>
<Text wrap="truncate">
{text5}
</Text>
<Text wrap="truncate">
{text6}
</Text>
</Box>
<Box flexDirection="row">
<Text wrap="truncate">
{text7}
</Text>
<Text wrap="truncate">
{text8}
</Text>
<Text wrap="truncate">
{text9}
</Text>
</Box>
</Box>
<Box flexDirection="row" alignItems="flex-start" marginLeft={1}>
<Box borderStyle="round" paddingX={1} flexShrink={1}>
<Text wrap="wrap">
{bubble}
</Text>
</Box>
</Box>
</Box>
{await next(e)}
</Box>
)
})
}
The mod's own code
Shown under the mod's licence (Apache-2.0); its text is below. Keep the notice if you copy these lines.
hooks/register.tsx lines 734–752 · Band
on('ui.render', { component: 'AbovePrompt' }, async ($, e, next) => {
const [snapshot, visible, hatching] = await Promise.all([read($, buddyAtom), read($, visibleAtom), read($, hatchingAtom)])
const buddy = toBuddy(snapshot)
if (e.props.hasSurvey || !visible) return next(e)
if (buddy === null && hatching === null) return next(e)
const [tickCount, bubble, hearts] = await Promise.all([read($, tickAtom), read($, bubbleAtom), read($, heartsAtom)])
const { Box, Text } = $.ui.resolve(e)
const egg: Buddy = { ...(ctx.bones ?? hatchBones('egg')), name: '?', personality: '', hatchedAt: 0 }
const view: BandView = {
buddy: buddy ?? egg,
frame: frameForTick(tickCount),
tick: tickCount,
bubble: bubble?.text ?? null,
hearts: hearts !== null && hearts < HEART_TICKS ? hearts : null,
columns: e.props.bodyColumns,
hatching,
}
return drawBand({ Box, Text }, view)
})hooks/draw.tsx lines 140–154 · Band
export function drawBand(ui: Table, view: BandView): RenderElement {
const { Box } = ui
if (view.hatching !== null) return drawHatching(ui, view)
const sprite = drawSprite(ui, view)
const bubbleWidth = view.columns - FRAME_WIDTH - 2
if (view.bubble === null || view.columns < COLLAPSE_COLUMNS || bubbleWidth < 8) {
return <Box flexDirection="row">{sprite}</Box>
}
return (
<Box flexDirection="row" alignItems="center">
{sprite}
{drawBubble(ui, view.bubble, bubbleWidth)}
</Box>
)
}hooks/draw.tsx lines 123–137 · Band
export function drawHatching(ui: Table, view: BandView): RenderElement {
const { Box, Text } = ui
const frame = HATCH_FRAMES[Math.min(view.hatching ?? 0, HATCH_FRAMES.length - 1)] ?? []
const isBurst = (view.hatching ?? 0) >= HATCH_FRAMES.length - 1
return (
<Box flexDirection="row" alignItems="center">
<Box flexDirection="column" flexShrink={0}>
{frame.map(line => (
<Text color={isBurst ? SHINY_COLOR : RARITY_COLOR[view.buddy.rarity]}>{line}</Text>
))}
</Box>
<Text dimColor> {isBurst ? 'hatched!' : 'hatching...'}</Text>
</Box>
)
}hooks/draw.tsx lines 90–108 · Band
export function drawSprite(ui: Table, view: BandView): RenderElement {
const { Box, Text } = ui
const color = spriteColor(view.buddy, view.tick)
const heartColor = RARITY_COLOR[view.buddy.rarity]
const rows = overlayHearts(spriteLines(view), view.hearts === null ? undefined : HEART_FRAMES[view.hearts])
return (
<Box flexDirection="column" width={FRAME_WIDTH} flexShrink={0}>
{rows.map(segments => (
<Box flexDirection="row">
{segments.map(s => (
<Text color={s.isHeart ? heartColor : color} wrap="truncate">
{s.text}
</Text>
))}
</Box>
))}
</Box>
)
}hooks/draw.tsx lines 111–120 · Band
export function drawBubble(ui: Table, text: string, width: number): RenderElement {
const { Box, Text } = ui
return (
<Box flexDirection="row" alignItems="flex-start" marginLeft={1}>
<Box borderStyle="round" paddingX={1} width={Math.max(8, Math.min(BUBBLE_MAX_COLUMNS, width))} flexShrink={1}>
<Text wrap="wrap">{text}</Text>
</Box>
</Box>
)
}Licence text (Apache-2.0)
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What its code calls
runs programsreads filesenv varsdrives Claudetool callsremembers
What its code shows
Read from the source at commit d8598a55ce80 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.5 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).hooks/register.tsx:406 grep (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.grep |
| 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.Apache-2.0 |
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 polus-1/buddy-mod/plugin install buddy@buddy-modThis installs the marketplace's latest commit, which may not be the one read here (d8598a55ce80). 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 "polus-1-buddy" 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
- Adds /seo-spend, /seo-doctor, /seo-cockpit
- Watches Agent calls and can refuse them
- Hooks agent.spawn, classic.SessionStart, prompt.submit, session.compact and 3 more
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could not fill the prompt boxcould not fill:Ask Claude…
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▴Token OptimizerCheckpointCheckpointCheckpointbuildStart freshbuildStart freshbuildStart freshbuildCheckpointCheckpointCheckpointCheckpointCheckpointCheckpointCheckpointCheckpointCheckpointbuildbuildbuildTokens savedSaved Clean up tokens in 30 days (chat 2 this session)Ask Claude…