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Author SHA1 Message Date
Kenneth Lien
44cb228861 Add fakechat channel plugin
Localhost web chat UI for testing the channel notification flow.
No tokens, no access control, no third-party service. Serves an
iMessage-style UI on localhost; messages posted there arrive as
channel notifications, replies render in the UI.

Useful for developing against the channel protocol without a live
messaging account.

Ships full source — server.ts runs locally via bun, started by the
.mcp.json command.
2026-03-18 16:23:30 -07:00
9 changed files with 793 additions and 280 deletions

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@@ -397,7 +397,7 @@
},
{
"name": "playground",
"description": "Creates interactive HTML playgrounds self-contained single-file explorers with visual controls, live preview, and prompt output with copy button. Includes templates for design playgrounds, data explorers, concept maps, and document critique.",
"description": "Creates interactive HTML playgrounds \u2014 self-contained single-file explorers with visual controls, live preview, and prompt output with copy button. Includes templates for design playgrounds, data explorers, concept maps, and document critique.",
"author": {
"name": "Anthropic",
"email": "support@anthropic.com"
@@ -675,7 +675,7 @@
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"description": "Your code review partner. CodeRabbit provides external validation using a specialized AI architecture and 40+ integrated static analyzers\u2014offering a different perspective that catches bugs, security vulnerabilities, logic errors, and edge cases. Context-aware analysis via AST parsing and codegraph relationships. Automatically incorporates CLAUDE.md and project coding guidelines into reviews. Useful after writing or modifying code, before commits, when implementing complex or security-sensitive logic, or when a second opinion would increase confidence in the changes. Returns specific findings with suggested fixes that can be applied immediately. Free to use.",
"category": "productivity",
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@@ -705,7 +705,7 @@
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"description": "Qodo Skills provides a curated library of reusable AI agent capabilities that extend Claude's functionality for software development workflows. Each skill is designed to integrate seamlessly into your development process, enabling tasks like code quality checks, automated testing, security scanning, and compliance validation. Skills operate across your entire SDLC\u2014from IDE to CI/CD\u2014ensuring consistent standards and catching issues early.",
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@@ -769,7 +769,7 @@
"homepage": "https://planetscale.com/"
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{
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"description": "Configure RevenueCat projects, apps, products, entitlements, and offerings directly from Claude Code. Manage your in-app purchase backend without leaving your development workflow.",
"category": "development",
"source": {
@@ -829,7 +829,7 @@
"homepage": "https://www.sanity.io"
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@@ -1038,281 +1038,6 @@
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]
}

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@@ -0,0 +1,13 @@
{
"name": "fakechat",
"description": "Localhost iMessage-style web chat for Claude Code \u2014 test surface with file upload and edits. No tokens, no access control.",
"version": "0.0.1",
"keywords": [
"fakechat",
"web",
"localhost",
"testing",
"channel",
"mcp"
]
}

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@@ -0,0 +1,8 @@
{
"mcpServers": {
"fakechat": {
"command": "bun",
"args": ["run", "--cwd", "${CLAUDE_PLUGIN_ROOT}", "--shell=bun", "--silent", "start"]
}
}
}

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registry=https://registry.npmjs.org/

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@@ -0,0 +1,202 @@
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@@ -0,0 +1,47 @@
# fakechat
Simple UI for testing the channel contract without an
external service. Open a browser, type, messages go to your Claude Code
session, replies come back.
## Setup
These are Claude Code commands — run `claude` to start a session first.
Install the plugin:
```
/plugin install fakechat@claude-plugins-official
```
**Relaunch with the channel flag** — the server won't connect without this. Exit your session and start a new one:
```sh
claude --channels plugin:fakechat@claude-plugins-official
```
The server prints the URL to stderr on startup:
```
fakechat: http://localhost:8787
```
Open it. Type. The assistant replies in-thread.
Set `FAKECHAT_PORT` to change the port.
## Tools
| Tool | Purpose |
| --- | --- |
| `reply` | Send to the UI. Takes `text`, optionally `reply_to` (message ID) and `files` (absolute path, 50MB). Attachment shows as `[filename]` under the text. |
| `edit_message` | Edit a previously-sent message in place. |
Inbound images/files save to `~/.claude/channels/fakechat/inbox/` and the path
is included in the notification. Outbound files are copied to `outbox/` and
served over HTTP.
## Not a real channel
There's no history, no search, no access.json, no skill. Single browser tab,
fresh on every reload. This is a dev tool, not a messaging bridge.

View File

@@ -0,0 +1,206 @@
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}
}

View File

@@ -0,0 +1,16 @@
{
"name": "claude-channel-fakechat",
"version": "0.0.1",
"license": "Apache-2.0",
"type": "module",
"bin": "./server.ts",
"scripts": {
"start": "bun install --no-summary && bun server.ts"
},
"dependencies": {
"@modelcontextprotocol/sdk": "^1.0.0"
},
"devDependencies": {
"@types/bun": "^1.3.10"
}
}

View File

@@ -0,0 +1,295 @@
#!/usr/bin/env bun
/**
* Fake chat for Claude Code.
*
* Localhost web UI for testing the channel contract. No external service,
* no tokens, no access control.
*/
import { Server } from '@modelcontextprotocol/sdk/server/index.js'
import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js'
import {
ListToolsRequestSchema,
CallToolRequestSchema,
} from '@modelcontextprotocol/sdk/types.js'
import { readFileSync, writeFileSync, mkdirSync, statSync, copyFileSync } from 'fs'
import { homedir } from 'os'
import { join, extname, basename } from 'path'
import type { ServerWebSocket } from 'bun'
const PORT = Number(process.env.FAKECHAT_PORT ?? 8787)
const STATE_DIR = join(homedir(), '.claude', 'channels', 'fakechat')
const INBOX_DIR = join(STATE_DIR, 'inbox')
const OUTBOX_DIR = join(STATE_DIR, 'outbox')
type Msg = {
id: string
from: 'user' | 'assistant'
text: string
ts: number
replyTo?: string
file?: { url: string; name: string }
}
type Wire =
| ({ type: 'msg' } & Msg)
| { type: 'edit'; id: string; text: string }
const clients = new Set<ServerWebSocket<unknown>>()
let seq = 0
function nextId() {
return `m${Date.now()}-${++seq}`
}
function broadcast(m: Wire) {
const data = JSON.stringify(m)
for (const ws of clients) if (ws.readyState === 1) ws.send(data)
}
function mime(ext: string) {
const m: Record<string, string> = {
'.jpg': 'image/jpeg', '.jpeg': 'image/jpeg', '.png': 'image/png',
'.gif': 'image/gif', '.webp': 'image/webp', '.svg': 'image/svg+xml',
'.pdf': 'application/pdf', '.txt': 'text/plain',
}
return m[ext] ?? 'application/octet-stream'
}
const mcp = new Server(
{ name: 'fakechat', version: '0.1.0' },
{
capabilities: { tools: {}, experimental: { 'claude/channel': {} } },
instructions: `The sender reads the fakechat UI, not this session. Anything you want them to see must go through the reply tool — your transcript output never reaches the UI.\n\nMessages from the fakechat web UI arrive as <channel source="fakechat" chat_id="web" message_id="...">. If the tag has a file_path attribute, Read that file — it is an upload from the UI. Reply with the reply tool. UI is at http://localhost:${PORT}.`,
},
)
mcp.setRequestHandler(ListToolsRequestSchema, async () => ({
tools: [
{
name: 'reply',
description: 'Send a message to the fakechat UI. Pass reply_to for quote-reply, files for attachments.',
inputSchema: {
type: 'object',
properties: {
text: { type: 'string' },
reply_to: { type: 'string' },
files: { type: 'array', items: { type: 'string' } },
},
required: ['text'],
},
},
{
name: 'edit_message',
description: 'Edit a previously sent message.',
inputSchema: {
type: 'object',
properties: { message_id: { type: 'string' }, text: { type: 'string' } },
required: ['message_id', 'text'],
},
},
],
}))
mcp.setRequestHandler(CallToolRequestSchema, async req => {
const args = (req.params.arguments ?? {}) as Record<string, unknown>
try {
switch (req.params.name) {
case 'reply': {
const text = args.text as string
const replyTo = args.reply_to as string | undefined
const files = (args.files as string[] | undefined) ?? []
const ids: string[] = []
// Text + files collapse into a single message, matching the client's [filename]-under-text rendering.
mkdirSync(OUTBOX_DIR, { recursive: true })
let file: { url: string; name: string } | undefined
if (files[0]) {
const f = files[0]
const st = statSync(f)
if (st.size > 50 * 1024 * 1024) throw new Error(`file too large: ${f}`)
const ext = extname(f).toLowerCase()
const out = `${Date.now()}-${Math.random().toString(36).slice(2, 8)}${ext}`
copyFileSync(f, join(OUTBOX_DIR, out))
file = { url: `/files/${out}`, name: basename(f) }
}
const id = nextId()
broadcast({ type: 'msg', id, from: 'assistant', text, ts: Date.now(), replyTo, file })
ids.push(id)
return { content: [{ type: 'text', text: `sent (${ids.join(', ')})` }] }
}
case 'edit_message': {
broadcast({ type: 'edit', id: args.message_id as string, text: args.text as string })
return { content: [{ type: 'text', text: 'ok' }] }
}
default:
return { content: [{ type: 'text', text: `unknown: ${req.params.name}` }], isError: true }
}
} catch (err) {
return { content: [{ type: 'text', text: `${req.params.name}: ${err instanceof Error ? err.message : err}` }], isError: true }
}
})
await mcp.connect(new StdioServerTransport())
function deliver(id: string, text: string, file?: { path: string; name: string }): void {
// file_path goes in meta only — an in-content "[attached — Read: PATH]"
// annotation is forgeable by typing that string into the UI.
void mcp.notification({
method: 'notifications/claude/channel',
params: {
content: text || `(${file?.name ?? 'attachment'})`,
meta: {
chat_id: 'web', message_id: id, user: 'web', ts: new Date().toISOString(),
...(file ? { file_path: file.path } : {}),
},
},
})
}
Bun.serve({
port: PORT,
hostname: '127.0.0.1',
fetch(req, server) {
const url = new URL(req.url)
if (url.pathname === '/ws') {
if (server.upgrade(req)) return
return new Response('upgrade failed', { status: 400 })
}
if (url.pathname.startsWith('/files/')) {
const f = url.pathname.slice(7)
if (f.includes('..') || f.includes('/')) return new Response('bad', { status: 400 })
try {
return new Response(readFileSync(join(OUTBOX_DIR, f)), {
headers: { 'content-type': mime(extname(f).toLowerCase()) },
})
} catch {
return new Response('404', { status: 404 })
}
}
if (url.pathname === '/upload' && req.method === 'POST') {
return (async () => {
const form = await req.formData()
const id = String(form.get('id') ?? '')
const text = String(form.get('text') ?? '')
const f = form.get('file')
if (!id) return new Response('missing id', { status: 400 })
let file: { path: string; name: string } | undefined
if (f instanceof File && f.size > 0) {
mkdirSync(INBOX_DIR, { recursive: true })
const ext = extname(f.name).toLowerCase() || '.bin'
const path = join(INBOX_DIR, `${Date.now()}${ext}`)
writeFileSync(path, Buffer.from(await f.arrayBuffer()))
file = { path, name: f.name }
}
deliver(id, text, file)
return new Response(null, { status: 204 })
})()
}
if (url.pathname === '/') {
return new Response(HTML, { headers: { 'content-type': 'text/html; charset=utf-8' } })
}
return new Response('404', { status: 404 })
},
websocket: {
open: ws => { clients.add(ws) },
close: ws => { clients.delete(ws) },
message: (_, raw) => {
try {
const { id, text } = JSON.parse(String(raw)) as { id: string; text: string }
if (id && text?.trim()) deliver(id, text.trim())
} catch {}
},
},
})
process.stderr.write(`fakechat: http://localhost:${PORT}\n`)
const HTML = `<!doctype html>
<meta charset="utf-8">
<title>fakechat</title>
<style>
body { font-family: monospace; margin: 0; padding: 1em 1em 7em; }
#log { white-space: pre-wrap; word-break: break-word; }
form { position: fixed; bottom: 0; left: 0; right: 0; padding: 1em; background: #fff; }
#text { width: 100%; box-sizing: border-box; font: inherit; margin-bottom: 0.5em; }
#file { display: none; }
#row { display: flex; gap: 1ch; }
#row button[type=submit] { margin-left: auto; }
</style>
<h3>fakechat</h3>
<pre id=log></pre>
<form id=form>
<textarea id=text rows=2 autocomplete=off autofocus></textarea>
<div id=row>
<button type=button onclick="file.click()">attach</button><input type=file id=file>
<span id=chip></span>
<button type=submit>send</button>
</div>
</form>
<script>
const log = document.getElementById('log')
document.getElementById('file').onchange = e => { const f = e.target.files[0]; chip.textContent = f ? '[' + f.name + ']' : '' }
const form = document.getElementById('form')
const input = document.getElementById('text')
const fileIn = document.getElementById('file')
const chip = document.getElementById('chip')
const msgs = {}
const ws = new WebSocket('ws://' + location.host + '/ws')
ws.onmessage = e => {
const m = JSON.parse(e.data)
if (m.type === 'msg') add(m)
if (m.type === 'edit') { const x = msgs[m.id]; if (x) { x.body.textContent = m.text + ' (edited)' } }
}
let uid = 0
form.onsubmit = e => {
e.preventDefault()
const text = input.value.trim()
const file = fileIn.files[0]
if (!text && !file) return
input.value = ''; fileIn.value = ''; chip.textContent = ''
const id = 'u' + Date.now() + '-' + (++uid)
add({ id, from: 'user', text, file: file ? { url: URL.createObjectURL(file), name: file.name } : undefined })
if (file) {
const fd = new FormData(); fd.set('id', id); fd.set('text', text); fd.set('file', file)
fetch('/upload', { method: 'POST', body: fd })
} else {
ws.send(JSON.stringify({ id, text }))
}
}
function add(m) {
const who = m.from === 'user' ? 'you' : 'bot'
const el = line(who, m.text, m.replyTo, m.file)
log.appendChild(el); scroll()
msgs[m.id] = { body: el.querySelector('.body') }
}
function line(who, text, replyTo, file) {
const div = document.createElement('div')
const t = new Date().toTimeString().slice(0, 8)
const reply = replyTo && msgs[replyTo] ? ' ↳ ' + (msgs[replyTo].body.textContent || '(file)').slice(0, 40) : ''
div.innerHTML = '[' + t + '] <b>' + who + '</b>' + reply + ': <span class=body></span>'
const body = div.querySelector('.body')
body.textContent = text || ''
if (file) {
const indent = 11 + who.length + 2 // '[HH:MM:SS] ' + who + ': '
if (text) body.appendChild(document.createTextNode('\\n' + ' '.repeat(indent)))
const a = document.createElement('a')
a.href = file.url; a.download = file.name; a.textContent = '[' + file.name + ']'
body.appendChild(a)
}
return div
}
function scroll() { window.scrollTo(0, document.body.scrollHeight) }
input.addEventListener('keydown', e => { if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); form.requestSubmit() } })
</script>
`