Add .mcpb Claude Desktop bundle with zero-config token handling
New scripts/build-mcpb.mjs packs a Claude Desktop extension bundle (scripts/mcpb-wrapper.mjs + manifest + icon) into dist-mcpb/tiletopia.mcpb. The wrapper reads the bearer token from %APPDATA% at launch and execs `npx -y mcp-remote`, so no secrets are baked in and Regenerate keeps working transparently. Run via `pnpm run build:mcpb`. McpPanel gets a "Download .mcpb" button linking to the releases page; the help-overlay tip and README MCP section both lead with the bundle install path and keep the .mcp.json shim recipe as the Claude Code fallback. Session-log entry in memory.md covers the design choices, especially why the wrapper-script approach beat the alternatives (user_config prompt would defeat one-click; baked-in token would be wrong for everyone else).
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scripts/build-mcpb.mjs
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scripts/build-mcpb.mjs
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#!/usr/bin/env node
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// build-mcpb.mjs — package tiletopia's Claude Desktop MCP bundle.
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//
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// Produces dist-mcpb/tiletopia.mcpb — an .mcpb (MCP Bundle, the format
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// formerly known as DXT) zip containing:
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// manifest.json → declares a node-type server pointing at the wrapper
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// server/index.mjs → the wrapper script that reads %APPDATA% and
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// execs `npx -y mcp-remote ...` (see mcpb-wrapper.mjs)
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// icon.png → 128×128 brand icon
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//
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// Usage:
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// pnpm run build:mcpb
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// or
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// node scripts/build-mcpb.mjs
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//
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// Output:
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// dist-mcpb/tiletopia.mcpb — drag-and-drop this into Claude Desktop's
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// Extensions panel to install.
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//
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// Design notes:
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// - The bundle bakes in NO secrets. The bearer token + port are read at
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// runtime from %APPDATA%\com.megaproxy.tiletopia\mcp.json on the user's
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// own machine. Each install of tiletopia generates its own token; the
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// bundle is the same for everyone.
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// - We write the zip ourselves (store-only, no compression) to avoid a
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// devDep on archiver/jszip/etc. The MCPB spec is just a regular zip;
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// three small files = trivial.
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// - The manifest's `version` mirrors package.json so the panel UI can show
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// "Bundle v0.2.3 — matches running app".
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import { readFile, writeFile, mkdir, stat } from "node:fs/promises";
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import { existsSync } from "node:fs";
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import { dirname, join, resolve } from "node:path";
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import { fileURLToPath } from "node:url";
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import { deflateRawSync, crc32 } from "node:zlib";
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const HERE = dirname(fileURLToPath(import.meta.url));
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const REPO_ROOT = resolve(HERE, "..");
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const PKG_PATH = join(REPO_ROOT, "package.json");
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const WRAPPER_PATH = join(HERE, "mcpb-wrapper.mjs");
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const ICON_PATH = join(REPO_ROOT, "src-tauri", "icons", "128x128.png");
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const OUT_DIR = join(REPO_ROOT, "dist-mcpb");
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const OUT_PATH = join(OUT_DIR, "tiletopia.mcpb");
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// ----------------------------------------------------------------------------
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// Read inputs
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// ----------------------------------------------------------------------------
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if (!existsSync(WRAPPER_PATH)) {
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console.error(`missing wrapper: ${WRAPPER_PATH}`);
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process.exit(1);
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}
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if (!existsSync(ICON_PATH)) {
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console.error(`missing icon: ${ICON_PATH}`);
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process.exit(1);
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}
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const pkg = JSON.parse(await readFile(PKG_PATH, "utf8"));
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const wrapperSrc = await readFile(WRAPPER_PATH);
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const iconBytes = await readFile(ICON_PATH);
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// ----------------------------------------------------------------------------
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// Manifest
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//
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// Schema reference: https://github.com/modelcontextprotocol/mcpb/blob/main/MANIFEST.md
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//
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// type=node + entry_point pointing at server/index.mjs + mcp_config.command
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// = "node" matches Claude Desktop's expectations. We avoid a `user_config`
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// block on purpose — the wrapper reads the token from %APPDATA% so the user
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// doesn't have to copy-paste it at install time.
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// ----------------------------------------------------------------------------
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const manifest = {
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manifest_version: "0.3",
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name: "tiletopia",
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display_name: "tiletopia (workspace driver)",
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version: pkg.version,
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description:
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"Drive your tiletopia workspace from Claude Desktop — inspect panes, " +
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"read scrollback, reshape the layout, and (with policy approval) send " +
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"commands.",
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long_description:
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"tiletopia is a Windows tiling terminal manager for WSL. This bundle " +
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"lets Claude Desktop connect to a running tiletopia process on the same " +
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"machine via its embedded MCP server. The bundle reads the per-install " +
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"bearer token and port from %APPDATA%\\com.megaproxy.tiletopia\\mcp.json " +
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"at launch, so you don't need to paste any credentials during install. " +
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"Start the MCP server once from tiletopia's 🤖 panel (Server: ON), then " +
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"drop this bundle into Claude Desktop and it will connect automatically. " +
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"All write operations (spawn, write keystrokes, reshape) are gated by " +
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"the per-pane allow-list and the user-editable policy inside tiletopia.",
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author: {
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name: "megaproxy",
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url: "https://git.rdx4.com/megaproxy/tiletopia",
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},
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repository: {
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type: "git",
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url: "https://git.rdx4.com/megaproxy/tiletopia.git",
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},
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homepage: "https://git.rdx4.com/megaproxy/tiletopia",
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documentation: "https://git.rdx4.com/megaproxy/tiletopia#mcp-server-claude-can-drive-the-workspace",
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support: "https://git.rdx4.com/megaproxy/tiletopia/issues",
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icon: "icon.png",
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server: {
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type: "node",
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entry_point: "server/index.mjs",
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mcp_config: {
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command: "node",
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args: ["${__dirname}/server/index.mjs"],
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},
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},
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keywords: ["tiletopia", "wsl", "terminal", "mcp", "claude"],
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license: "Proprietary",
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compatibility: {
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// Claude Desktop runtime requirements — the bundle launches node, which
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// shells out to npx mcp-remote; both need Node 18+ on PATH.
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platforms: ["win32"],
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runtimes: {
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node: ">=18.0.0",
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},
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},
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};
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const manifestBytes = Buffer.from(JSON.stringify(manifest, null, 2), "utf8");
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// ----------------------------------------------------------------------------
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// Build the .mcpb zip
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//
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// The MCPB spec is a plain ZIP file. We're writing three small files, so a
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// pure-Node store-only writer is simplest. Avoids adding archiver as a
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// devDep. Format reference: APPNOTE.TXT 6.3.4 sections 4.3 (local file
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// header), 4.4 (data descriptor), 4.5 (central directory).
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// ----------------------------------------------------------------------------
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const SIG_LFH = 0x04034b50;
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const SIG_CDH = 0x02014b50;
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const SIG_EOCD = 0x06054b50;
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function dosTimeDate(date) {
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// DOS time/date format (2-second resolution; epoch 1980-01-01).
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const yr = Math.max(date.getFullYear(), 1980) - 1980;
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const time =
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((date.getHours() & 0x1f) << 11) |
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((date.getMinutes() & 0x3f) << 5) |
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((Math.floor(date.getSeconds() / 2)) & 0x1f);
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const dt =
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((yr & 0x7f) << 9) |
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(((date.getMonth() + 1) & 0x0f) << 5) |
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(date.getDate() & 0x1f);
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return { time, date: dt };
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}
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function buildZip(entries) {
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const now = dosTimeDate(new Date());
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const chunks = [];
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const centralDir = [];
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let offset = 0;
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for (const { name, data } of entries) {
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const nameBuf = Buffer.from(name, "utf8");
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const crc = crc32(data); // store-only — uncompressed crc == compressed crc
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const size = data.length;
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// Local file header (4.3.7)
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const lfh = Buffer.alloc(30);
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lfh.writeUInt32LE(SIG_LFH, 0);
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lfh.writeUInt16LE(20, 4); // version needed (2.0)
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lfh.writeUInt16LE(0, 6); // general purpose bit flag
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lfh.writeUInt16LE(0, 8); // compression: store
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lfh.writeUInt16LE(now.time, 10);
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lfh.writeUInt16LE(now.date, 12);
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lfh.writeUInt32LE(crc, 14);
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lfh.writeUInt32LE(size, 18); // compressed size (== size for store)
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lfh.writeUInt32LE(size, 22); // uncompressed size
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lfh.writeUInt16LE(nameBuf.length, 26);
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lfh.writeUInt16LE(0, 28); // extra field length
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chunks.push(lfh, nameBuf, data);
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// Central directory header (4.4.7)
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const cdh = Buffer.alloc(46);
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cdh.writeUInt32LE(SIG_CDH, 0);
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cdh.writeUInt16LE(20, 4); // version made by
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cdh.writeUInt16LE(20, 6); // version needed
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cdh.writeUInt16LE(0, 8); // gp flag
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cdh.writeUInt16LE(0, 10); // compression
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cdh.writeUInt16LE(now.time, 12);
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cdh.writeUInt16LE(now.date, 14);
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cdh.writeUInt32LE(crc, 16);
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cdh.writeUInt32LE(size, 20); // compressed size
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cdh.writeUInt32LE(size, 24); // uncompressed
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cdh.writeUInt16LE(nameBuf.length, 28);
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cdh.writeUInt16LE(0, 30); // extra len
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cdh.writeUInt16LE(0, 32); // comment len
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cdh.writeUInt16LE(0, 34); // disk number
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cdh.writeUInt16LE(0, 36); // internal attrs
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cdh.writeUInt32LE(0, 38); // external attrs
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cdh.writeUInt32LE(offset, 42); // local header offset
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centralDir.push(cdh, nameBuf);
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offset += lfh.length + nameBuf.length + data.length;
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}
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const cdStart = offset;
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for (const buf of centralDir) {
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chunks.push(buf);
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offset += buf.length;
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}
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const cdSize = offset - cdStart;
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// End of central directory record (4.5)
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const eocd = Buffer.alloc(22);
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eocd.writeUInt32LE(SIG_EOCD, 0);
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eocd.writeUInt16LE(0, 4); // disk number
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eocd.writeUInt16LE(0, 6); // start disk
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eocd.writeUInt16LE(entries.length, 8); // entries on this disk
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eocd.writeUInt16LE(entries.length, 10); // total entries
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eocd.writeUInt32LE(cdSize, 12);
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eocd.writeUInt32LE(cdStart, 16);
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eocd.writeUInt16LE(0, 20); // comment length
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chunks.push(eocd);
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// Silence the "unused on store path" lint trip; deflateRawSync stays
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// imported so a future maintainer who wants to add compression doesn't
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// have to re-figure out the right symbol.
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void deflateRawSync;
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return Buffer.concat(chunks);
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}
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const entries = [
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{ name: "manifest.json", data: manifestBytes },
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{ name: "server/index.mjs", data: wrapperSrc },
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{ name: "icon.png", data: iconBytes },
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];
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const zipBytes = buildZip(entries);
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await mkdir(OUT_DIR, { recursive: true });
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await writeFile(OUT_PATH, zipBytes);
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const sizeKB = (zipBytes.length / 1024).toFixed(1);
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console.log(`wrote ${OUT_PATH} (${sizeKB} KB, ${entries.length} entries)`);
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for (const e of entries) {
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console.log(` ${e.name.padEnd(20)} ${e.data.length} bytes`);
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}
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console.log(
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`manifest version ${manifest.version} (mirrors package.json); ` +
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"to install, drag the .mcpb file into Claude Desktop's Extensions panel.",
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);
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// Touch stat() so any "wrote nothing" CI bug surfaces here, not at the user's
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// next install.
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const written = await stat(OUT_PATH);
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if (written.size !== zipBytes.length) {
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console.error(
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`size mismatch: wrote ${zipBytes.length} bytes, file is ${written.size}`,
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);
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process.exit(1);
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}
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