  res.writeHead(404, { 'Content-Type': 'application/json' });
  res.end(JSON.stringify({ error: 'Not found' }));
}

// ─────────────────────────────────────────────────────────────
// WebSocket Server - Browser clients
// ─────────────────────────────────────────────────────────────

const wss = new WebSocketServer({ noServer: true });

wss.on('connection', (ws) => {
  console.log('[Tau Mux] Browser client connected');
  browserClients.add(ws);
  ws.isAlive = true;

  ws.on('pong', () => { ws.isAlive = true; });

  ws.on('close', () => {
    console.log('[Tau Mux] Browser client disconnected');
    browserClients.delete(ws);
  });

  ws.on('error', (e) => {
    browserClients.delete(ws);
  });
});

// ─────────────────────────────────────────────────────────────
// WebSocket Server - Pi client connections
// ─────────────────────────────────────────────────────────────

const wssPi = new WebSocketServer({ noServer: true });

wssPi.on('connection', (ws) => {
  console.log('[Tau Mux] Pi client connected');

  ws.on('message', (data) => {
    try {
      const msg = JSON.parse(data.toString());
      handlePiMessage(ws, msg);
    } catch (e) {
      console.error('[Tau Mux] Failed to parse pi message:', e);
    }
  });

  ws.on('close', () => {
    console.log('[Tau Mux] Pi client disconnected');
    // Remove from piClients
    for (const [sessionId, client] of piClients.entries()) {
      if (client === ws) {
        piClients.delete(sessionId);
        break;
      }
    }
  });
});

server.on('upgrade', (request, socket, head) => {
  if (request.url === '/ws') {
    wss.handleUpgrade(request, socket, head, (ws) => {
      wss.emit('connection', ws, request);
    });
  } else if (request.url === '/pi') {
    wssPi.handleUpgrade(request, socket, head, (ws) => {
      wssPi.emit('connection', ws, request);
    });
  } else {
    socket.destroy();
  }
});

function handlePiMessage(ws, msg) {
  switch (msg.type) {
    case 'register':
      piClients.set(msg.sessionId, ws);
      console.log(`[Tau Mux] Registered session: ${msg.sessionId}`);
      // Send server URLs back to the client
      ws.send(JSON.stringify({
        type: 'registered',
        serverUrls: {
          local: `http://localhost:${PORT}`,
          tailscale: tailscaleInfo ? (tailscaleInfo.ip ? `http://${tailscaleInfo.ip}:${PORT}` : null) : null,
          magicDns: tailscaleInfo?.hostname ? `http://${tailscaleInfo.hostname}:${PORT}` : null
        }
      }));
      broadcastToBrowsers({ type: 'pi_registered', sessionId: msg.sessionId });
      break;

    case 'unregister':
      piClients.delete(msg.sessionId);
      console.log(`[Tau Mux] Unregistered session: ${msg.sessionId}`);
      broadcastToBrowsers({ type: 'pi_unregistered', sessionId: msg.sessionId });
      break;

    case 'event':
      // Forward events to browser clients
      broadcastToBrowsers({ type: 'event', event: msg.event });
      break;

    case 'state':
      // Update state for this session
      broadcastToBrowsers({ type: 'state_update', sessionId: msg.sessionId, state: msg.state });
      break;
  }
}

function broadcastToBrowsers(data) {
  const json = JSON.stringify(data);
  for (const client of browserClients) {
    if (client.readyState === WebSocket.OPEN) {
      client.send(json);
    }
  }
}

// ─────────────────────────────────────────────────────────────
// Heartbeat
// ─────────────────────────────────────────────────────────────

setInterval(() => {

[79 more lines in file. Use offset=600 to continue.]


/**
 * WebSocket Client - Handles connection to backend WebSocket server
 */

export class WebSocketClient extends EventTarget {
  constructor(url) {
    super();
    this.url = url;
    this.ws = null;
    this.reconnectAttempts = 0;
    this.maxReconnectAttempts = Infinity;
    this.reconnectDelay = 1000;
    this.maxReconnectDelay = 10000;
    this.isIntentionallyClosed = false;
    this.reconnectTimer = null;
    this.connectionState = 'idle';
  }

  connect() {
    if (this.connectionState === 'connecting') return;
    if (this.ws && this.ws.readyState === WebSocket.OPEN) return;
    if (this.ws && this.ws.readyState === WebSocket.CONNECTING) return;

    this.isIntentionallyClosed = false;
    this.connectionState = 'connecting';
    if (this.reconnectTimer) {
      clearTimeout(this.reconnectTimer);
      this.reconnectTimer = null;
    }
    // Close only fully stale sockets before reconnecting
    if (this.ws && (this.ws.readyState === WebSocket.CLOSING || this.ws.readyState === WebSocket.CLOSED)) {
      this.ws = null;
    }
    this.ws = new WebSocket(this.url);

    this.ws.onopen = () => {
      console.log('[WS] Connected');
      this.reconnectAttempts = 0;
      this.connectionState = 'open';
      this.dispatchEvent(new CustomEvent('connected'));
    };

    this.ws.onmessage = (event) => {
      try {
        const message = JSON.parse(event.data);
        this.handleMessage(message);
      } catch (error) {
        console.error('[WS] Failed to parse message:', error);
      }
    };

    this.ws.onerror = (error) => {
      console.error('[WS] Error:', error);
      this.dispatchEvent(new CustomEvent('error', { detail: error }));
    };

    this.ws.onclose = (event) => {
      console.log(`[WS] Disconnected (code=${event.code}, reason=${event.reason || 'n/a'})`);
      this.connectionState = 'closed';
      this.dispatchEvent(new CustomEvent('disconnected'));

      if (!this.isIntentionallyClosed) {
        this.attemptReconnect();
      }
    };
  }

  disconnect() {
    this.isIntentionallyClosed = true;
    this.connectionState = 'closed';
    if (this.reconnectTimer) {
      clearTimeout(this.reconnectTimer);
      this.reconnectTimer = null;
    }
    if (this.ws) {
      this.ws.close();
    }
  }

  // Force reconnect — resets attempt counter and connects fresh
  forceReconnect() {
    this.reconnectAttempts = 0;
    this.isIntentionallyClosed = false;
    this.connectionState = 'closed';
    if (this.ws && this.ws.readyState === WebSocket.OPEN) {
      try { this.ws.close(1000, 'force reconnect'); } catch (e) {}
    }
    if (this.reconnectTimer) {
      clearTimeout(this.reconnectTimer);
      this.reconnectTimer = null;
    }
    this.connect();
  }

  attemptReconnect() {
    if (this.reconnectAttempts >= this.maxReconnectAttempts) {
      console.error('[WS] Max reconnection attempts reached');
      this.dispatchEvent(new CustomEvent('reconnectFailed'));
      return;
    }

    this.reconnectAttempts++;
    const delay = Math.min(this.maxReconnectDelay, this.reconnectDelay * Math.pow(2, this.reconnectAttempts - 1));

    console.log(`[WS] Reconnecting in ${delay}ms (attempt ${this.reconnectAttempts}/${this.maxReconnectAttempts})`);

    this.reconnectTimer = setTimeout(() => {
      this.reconnectTimer = null;
      this.connect();
    }, delay);
  }

  send(data) {
    if (this.ws && this.ws.readyState === WebSocket.OPEN) {
      this.ws.send(JSON.stringify(data));
    } else {
      console.error('[WS] Cannot send, not connected');
    }
  }

  handleMessage(message) {
    // Emit events based on message type
    switch (message.type) {
      case 'event':
        this.dispatchEvent(new CustomEvent('rpcEvent', { detail: message.event }));
        break;
      case 'state':
        this.dispatchEvent(new CustomEvent('stateUpdate', { detail: message }));
        break;
      case 'error':
        this.dispatchEvent(new CustomEvent('serverError', { detail: message }));
        break;
      case 'session_switch':
        this.dispatchEvent(new CustomEvent('sessionSwitch'));
        break;
      case 'mirror_sync':
        this.dispatchEvent(new CustomEvent('mirrorSync', { detail: message }));
        break;
      default:
        console.warn('[WS] Unknown message type:', message.type);
    }
  }
}


  const shortName = currentModelId.replace(/^claude-/, '').replace(/-\d{8}$/, '');
  modelDropdownLabel.textContent = shortName || 'model';
}

function toggleModelDropdown() {
  const isOpen = !modelDropdownMenu.classList.contains('hidden');
  if (isOpen) {
    closeModelDropdown();
  } else {
    openModelDropdown();
  }
}

function openModelDropdown() {
  modelDropdownMenu.innerHTML = '';

  // Search input
  const search = document.createElement('input');
  search.className = 'model-dropdown-search';
  search.placeholder = 'Search models…';
  search.type = 'text';
  modelDropdownMenu.appendChild(search);

  // Items container
  const itemsContainer = document.createElement('div');
  itemsContainer.className = 'model-dropdown-items';
  modelDropdownMenu.appendChild(itemsContainer);

  function renderItems(filter) {
    itemsContainer.innerHTML = '';
    const query = (filter || '').toLowerCase();
    availableModels.forEach(m => {
      const shortName = m.id.replace(/-\d{8}$/, '');
      const providerStr = m.provider || '';
      if (query && !shortName.toLowerCase().includes(query) && !providerStr.toLowerCase().includes(query)) return;

      const el = document.createElement('div');
      el.className = `model-dropdown-item${m.id === currentModelId ? ' active' : ''}`;
      const ctxK = m.contextWindow ? `${(m.contextWindow / 1000).toFixed(0)}k` : '';
      const providerLabel = m.provider && m.provider !== 'anthropic' ? `<span class="model-dropdown-item-provider">${m.provider}</span>` : '';
      el.innerHTML = `<span>${shortName}${providerLabel}</span><span class="model-dropdown-item-ctx">${ctxK}</span>`;
      el.addEventListener('click', async () => {
        closeModelDropdown();
        const display = m.id.replace(/^claude-/, '').replace(/-\d{8}$/, '');
        await rpcCommand({ type: 'set_model', provider: m.provider, modelId: m.id }, `Switching to ${display}...`);
        currentModelId = m.id;
        updateModelLabel();
        if (m.contextWindow) {
          contextWindowSize = m.contextWindow;
          updateTokenUsage();
        }
      });
      itemsContainer.appendChild(el);
    });
  }

  renderItems('');

  search.addEventListener('input', () => renderItems(search.value));
  search.addEventListener('keydown', (e) => {
    if (e.key === 'Escape') { closeModelDropdown(); e.stopPropagation(); }
    if (e.key === 'Enter') {
      const first = itemsContainer.querySelector('.model-dropdown-item');
      if (first) first.click();
    }
  });

  modelDropdownMenu.classList.remove('hidden');
  modelDropdown.classList.add('open');
  requestAnimationFrame(() => search.focus());
}

function closeModelDropdown() {
  modelDropdownMenu.classList.add('hidden');
  modelDropdown.classList.remove('open');
}

modelDropdownBtn.addEventListener('click', toggleModelDropdown);

// Close dropdown on outside click
document.addEventListener('click', (e) => {
  if (!modelDropdown.contains(e.target)) {
    closeModelDropdown();
  }
});

// Thinking level button — cycles through levels
thinkingBtn.addEventListener('click', async () => {
  const data = await rpcCommand({ type: 'cycle_thinking_level' }, 'Cycling thinking...');
  if (data?.success && data.data?.level) {
    currentThinkingLevel = data.data.level;
    updateThinkingBtn();
  }
});

// ═══════════════════════════════════════
// Keyboard shortcuts
// ═══════════════════════════════════════

document.addEventListener('keydown', (e) => {
  // Escape — Abort streaming, or close sidebar on mobile
  if (e.key === 'Escape') {
    // Close palettes/panels first
    if (!settingsPanel.classList.contains('hidden')) {
      closeSettings();
      return;
    }
    if (!commandPalette.classList.contains('hidden')) {
      closeCommandPalette();
      return;
    }
    if (!modelDropdownMenu.classList.contains('hidden')) {
      closeModelDropdown();
      return;
    }

    if (state.isStreaming) {
      wsClient.send({ type: 'abort' });
      messageRenderer.renderError('Aborted by user');
      showTypingIndicator(false);

[967 more lines in file. Use offset=940 to continue.]


**Inspecting browser commands**

I need to check if the extension tau-client can send state. It seems like it might be able to handle browser commands if the server is set up to forward them. Right now, it only handles specific commands like prompt, set_model, and set_thinking level, but it doesn't appear to support rpc. I wonder if the browser expects an rpcCommand and if the server needs to emulate that. I should look into the rpcCommand implementation for further clarity.

bash

grep -n "function rpcCommand\|rpcCommand(" /home/sebas/.npm-global/lib/node_modules/pi-tau-mux-server/public/app.js | head -20

grep -n "case 'state'\|type: 'state'\|mirror_sync_request\|cycle_thinking_level\|compact\|abort" /home/sebas/.npm-global/lib/node_modules/pi-tau-mux/extensions/tau-client.ts /home/sebas/.npm-global/lib/node_modules/pi-tau-mux-server/src/server.js | sed -n '1,120p'


686:  { icon: '🗜', label: 'Compact', desc: 'Compact context to save tokens', action: () => rpcCommand({ type: 'compact' }, 'Compacting...') },
724:async function rpcCommand(cmd, statusMsg) {
748:  const data = await rpcCommand({ type: 'export_html' }, 'Exporting...');
756:  const data = await rpcCommand({ type: 'get_session_stats' }, 'Loading stats...');
864:        await rpcCommand({ type: 'set_model', provider: m.provider, modelId: m.id }, `Switching to ${display}...`);
908:  const data = await rpcCommand({ type: 'cycle_thinking_level' }, 'Cycling thinking...');
1400:    rpcCommand({ type: 'compact' }, 'Compacting...');
1542:    const authData = await rpcCommand({ type: 'get_auth' });
1567:  await rpcCommand({ type: 'set_auto_compaction', enabled: !isOn });
1572:  const data = await rpcCommand({ type: 'cycle_thinking_level' });
1598:  const data = await rpcCommand({ type: 'set_auth', enabled: !isOn });


const refreshSessionsBtn = document.getElementById('refresh-sessions-btn');
const toggleAllSessionsBtn = document.getElementById('toggle-all-sessions-btn');
const sessionSearchInput = document.getElementById('session-search-input');
const typingIndicator = document.getElementById('typing-indicator');

const sessionCostEl = document.getElementById('session-cost');
const tokenUsageEl = document.getElementById('token-usage');
const scrollBottomBtn = document.getElementById('scroll-bottom-btn');
const scrollBottomBadge = document.getElementById('scroll-bottom-badge');
const messagesContainer = document.getElementById('messages');

// State tracking
let currentStreamingElement = null;
let currentStreamingText = '';
let sessionTotalCost = 0;
let lastInputTokens = 0;
let contextWindowSize = 0;  // fetched from model info
let originalTitle = document.title;
let hasFocus = true;
let unreadCount = 0;
let isScrolledUp = false;
let hasNewWhileScrolled = false;
let lastSentMessage = null; // Track to avoid duplicate rendering in mirror mode
let lastUsage = null; // Full usage object for context visualiser
let mirrorActiveSessionFile = null; // The live session file path from the TUI
let viewingActiveSession = true; // Whether we're viewing the live session or a historical one
let isMirrorMode = false; // Set when mirror_sync received
let liveInstances = []; // All running Tau instances [{port, sessionFile, cwd}]

// File browser
const fileSidebar = document.getElementById('file-sidebar');
const fileSidebarToggle = document.getElementById('file-sidebar-toggle');
const fileSidebarClose = document.getElementById('file-sidebar-close');
const fileSidebarUp = document.getElementById('file-sidebar-up');
const fileList = document.getElementById('file-list');
const fileSidebarPath = document.getElementById('file-sidebar-path');
const fileBrowser = new FileBrowser(fileList, fileSidebarPath, messageInput);

fileSidebarToggle.addEventListener('click', () => {
  const isCollapsed = fileSidebar.classList.toggle('collapsed');
  if (!isCollapsed && !fileBrowser.currentPath) {
    fileBrowser.load(); // Load session cwd
  }
  localStorage.setItem('tau-file-sidebar', isCollapsed ? 'closed' : 'open');
});

fileSidebarClose.addEventListener('click', () => {
  fileSidebar.classList.add('collapsed');
  localStorage.setItem('tau-file-sidebar', 'closed');
});

fileSidebarUp.addEventListener('click', () => {
  const parent = fileBrowser.getParentPath();
  if (parent) fileBrowser.load(parent);
});

document.getElementById('file-sidebar-finder').addEventListener('click', () => {
  if (fileBrowser.currentPath) {
    fetch('/api/open', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ filePath: fileBrowser.currentPath }),
    });
  }
});

// Restore file sidebar state
if (localStorage.getItem('tau-file-sidebar') === 'open') {
  fileSidebar.classList.remove('collapsed');
  fileBrowser.load();
}

// ═══════════════════════════════════════
// Focus tracking for tab title notifications
// ═══════════════════════════════════════

window.addEventListener('focus', () => {
  hasFocus = true;
  unreadCount = 0;
  document.title = originalTitle;
});

window.addEventListener('blur', () => {
  hasFocus = false;
});

// Reconnect WebSocket when returning to the app (iOS suspends WS connections)
document.addEventListener('visibilitychange', () => {
  if (document.visibilityState === 'visible' && wsClient.ws?.readyState !== WebSocket.OPEN) {
    console.log('[App] Returning to app, reconnecting...');
    wsClient.forceReconnect();
  }
});

// ═══════════════════════════════════════
// Scroll-to-bottom button + new message indicator
// ═══════════════════════════════════════

messagesContainer.addEventListener('scroll', () => {
  const threshold = 150;
  const atBottom = messagesContainer.scrollHeight - messagesContainer.scrollTop - messagesContainer.clientHeight < threshold;
  isScrolledUp = !atBottom;

  if (atBottom) {
    scrollBottomBtn.classList.add('hidden');
    scrollBottomBadge.classList.add('hidden');
    hasNewWhileScrolled = false;
  } else {
    scrollBottomBtn.classList.remove('hidden');
  }
});

scrollBottomBtn.addEventListener('click', () => {
  messagesContainer.scrollTo({ top: messagesContainer.scrollHeight, behavior: 'smooth' });

[1747 more lines in file. Use offset=160 to continue.]


/home/sebas/.npm-global/lib/node_modules/pi-tau-mux/extensions/tau-client.ts:182:  "auto_compaction_start", "auto_compaction_end",
/home/sebas/.npm-global/lib/node_modules/pi-tau-mux-server/src/server.js:579:    case 'state':


commandBtn.addEventListener('click', openCommandPalette);
commandPaletteOverlay.addEventListener('click', closeCommandPalette);

async function rpcCommand(cmd, statusMsg) {
  try {
    if (statusMsg) statusText.textContent = statusMsg;
    const resp = await fetch('/api/rpc', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(cmd),
    });
    const data = await resp.json();
    if (data.success) {
      statusText.textContent = 'Done';
      setTimeout(() => { statusText.textContent = 'Connected'; }, 2000);
    } else {
      statusText.textContent = data.error || 'Failed';
      setTimeout(() => { statusText.textContent = 'Connected'; }, 3000);
    }
    return data;
  } catch (e) {
    statusText.textContent = 'Error';
    setTimeout(() => { statusText.textContent = 'Connected'; }, 3000);
  }
}

async function rpcExportHtml() {
  const data = await rpcCommand({ type: 'export_html' }, 'Exporting...');
  if (data?.success && data.data?.path) {
    statusText.textContent = `Exported: ${data.data.path}`;
    setTimeout(() => { statusText.textContent = 'Connected'; }, 4000);
  }
}

async function showSessionStats() {
  const data = await rpcCommand({ type: 'get_session_stats' }, 'Loading stats...');
  if (data?.success && data.data) {
    const s = data.data;
    const lines = [
      `📊 Session Stats`,
      `Messages: ${s.totalMessages} (${s.userMessages} user, ${s.assistantMessages} assistant)`,
      `Tool calls: ${s.toolCalls}`,
    ];
    if (s.tokens) {
      lines.push(`Context: ~${(s.tokens.input / 1000).toFixed(1)}k tokens`);
    }
    messageRenderer.renderSystemMessage(lines.join('\n'));
  }
}

// ═══════════════════════════════════════
// Model Picker
// ═══════════════════════════════════════

const modelDropdown = document.getElementById('model-dropdown');
const modelDropdownBtn = document.getElementById('model-dropdown-btn');
const modelDropdownLabel = document.getElementById('model-dropdown-label');
const modelDropdownMenu = document.getElementById('model-dropdown-menu');
const thinkingBtn = document.getElementById('thinking-btn');

[1127 more lines in file. Use offset=780 to continue.]


grep -n "/api/rpc\|get_session_stats\|cycle_thinking_level\|set_model\|compact\|export_html\|get_auth\|set_auth\|set_auto_compaction" /home/sebas/.npm-global/lib/node_modules/pi-tau-mux-server/src/server.js | sed -n '1,120p'


(no output)


**Analyzing RPC Implementation Issues**

I’m noticing that the RPC implementation is lacking and making the whole package feel broken. A quick fix could involve implementing browser message forwarding for prompt/abort and maybe /api/rpc for managing models. However, the user mentioned no models/menu, so I need to clarify about the custom menu and check its usefulness. I should explore the tau-client extension to see if it can handle more than just setting models and thinking levels. It seems like I need to figure out how to store and manage the state more effectively.

grep -n "send(JSON.stringify({ type: 'state'\|type: \"state\"\|availableModels\|thinkingLevel\|autoCompaction\|auth" /home/sebas/.npm-global/lib/node_modules/pi-tau-mux/extensions/tau-client.ts | sed -n '1,200p'


112:  const thinkingLevel = pi.getThinkingLevel();
117:    type: "state",
122:      thinkingLevel,


/**
 * Tau Client Extension
 *
 * Lightweight client that connects to pi-tau-mux-server.
 * - Registers this pi instance with the mux server
 * - Forwards events (messages, model changes, etc.) to the server
 * - Unregisters on shutdown
 * - Optionally prompts to start the mux server if not running
 */

import type { ExtensionAPI, ExtensionContext } from "@mariozechner/pi-coding-agent";
import { WebSocket } from "ws";
import * as fs from "node:fs";
import * as path from "node:path";
import { exec } from "node:child_process";

// Configuration
const MUX_PORT = parseInt(process.env.TAU_PORT || "3001");
const MUX_HOST = process.env.TAU_HOST || "localhost";
const MUX_URL = `ws://${MUX_HOST}:${MUX_PORT}/pi`;
const AUTO_CONNECT = process.env.TAU_AUTO_CONNECT !== "0";

let ws: WebSocket | null = null;
let latestCtx: ExtensionContext | null = null;
let reconnectTimer: NodeJS.Timeout | null = null;
let sessionId: string | null = null;
let serverUrls: { local?: string; tailscale?: string; magicDns?: string } | null = null;

// ─────────────────────────────────────────────────────────────
// Connection management
// ─────────────────────────────────────────────────────────────

function connect(pi: ExtensionAPI, ctx: ExtensionContext, promptIfDown = true) {
  if (ws) return; // Already connected

  try {
    ws = new WebSocket(MUX_URL);

    ws.on("open", () => {
      // Register this instance
      sessionId = ctx.sessionManager.getSessionFile()?.split("/").pop()?.replace(".jsonl", "") || Date.now().toString();
      send({ type: "register", sessionId, cwd: ctx.cwd || process.cwd() });

      // Send initial state
      sendState(ctx, pi);

      // Notify user of successful connection
      // Use server's Tailscale URL if available, otherwise fall back to connection URL
      const displayUrl = serverUrls?.tailscale || serverUrls?.magicDns || `http://${MUX_HOST}:${MUX_PORT}`;
      const location = serverUrls?.tailscale ? 'Tailscale' : serverUrls?.magicDns ? 'MagicDNS' : (MUX_HOST === 'localhost' ? 'local' : MUX_HOST);
      ctx.ui.notify(`Connected to Tau mux server at ${location}  •  View UI at ${displayUrl}`, "info");
    });

    ws.on("message", (data) => {
      try {
        const msg = JSON.parse(data.toString());
        handleMessage(msg, ctx, pi);
      } catch {}
    });

    ws.on("close", () => {
      ws = null;

      // Attempt reconnect after delay
      if (!reconnectTimer) {
        reconnectTimer = setTimeout(() => {
          reconnectTimer = null;
          if (latestCtx) connect(pi, latestCtx, false);
        }, 5000);
      }
    });

    ws.on("error", (e) => {
      // Prompt to start server if not running
      if (promptIfDown && e.message.includes("ECONNREFUSED")) {
        promptStartMux(pi, ctx);
      }

      ws = null;
    });
  } catch {
    // Connection failed silently
  }
}

function disconnect() {
  if (ws) {
    if (sessionId) {
      send({ type: "unregister", sessionId });
    }
    ws.close();
    ws = null;
  }

  if (reconnectTimer) {
    clearTimeout(reconnectTimer);
    reconnectTimer = null;
  }
}

function send(msg: any) {
  if (ws && ws.readyState === WebSocket.OPEN) {
    ws.send(JSON.stringify(msg));
  }
}

function sendState(ctx: ExtensionContext, pi: ExtensionAPI) {
  if (!sessionId) return;

  const entries = ctx.sessionManager.getEntries();
  const model = ctx.model;
  const thinkingLevel = pi.getThinkingLevel();
  const sessionName = pi.getSessionName();
  const sessionFile = ctx.sessionManager.getSessionFile();

  send({
    type: "state",
    sessionId,
    state: {
      entries,
      model,
      thinkingLevel,
      sessionName,
      sessionFile,
      isStreaming: !ctx.isIdle(),
    }
  });
}

function promptStartMux(pi: ExtensionAPI, ctx: ExtensionContext) {
  ctx.ui.confirm(
    "Tau mux server not running. Start it now?",
    "Yes, start server",
    "No, skip"
  ).then((response) => {
    if (response === "Yes, start server") {
      exec("npx pi-tau-mux-server", (err) => {
        if (err) {
          ctx.ui.notify("Failed to start tau mux server: " + err.message, "error");
        }

[99 more lines in file. Use offset=141 to continue.]


**Exploring API functionality**

I need to consider the pi API to get the session name, and maybe some other details. I think I could implement a minimal /api/rpc with the latest stored state. For commands like set_model and thinking, I might use a WebSocket to send messages to the client and confirm success. However, I'm unsure about the available models. It seems the browser could show the current model directly without dropdown choices if there are no available models. I might need to search for the app's initialization to find those available models, perhaps by checking /api/models.

grep -n "availableModels\|currentModelId\|get_state\|/api/models\|models =" /home/sebas/.npm-global/lib/node_modules/pi-tau-mux-server/public/app.js | sed -n '1,120p'


784:let currentModelId = '';
785:let availableModels = [];
792:      fetch('/api/rpc', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ type: 'get_state' }) }),
798:      availableModels = modelsData.data.models;
801:      currentModelId = stateData.data.model.id || '';
804:      const model = availableModels.find(m => m.id === currentModelId);
820:  const shortName = currentModelId.replace(/^claude-/, '').replace(/-\d{8}$/, '');
851:    availableModels.forEach(m => {
857:      el.className = `model-dropdown-item${m.id === currentModelId ? ' active' : ''}`;
865:        currentModelId = m.id;
1171:    currentModelId = data.model.id || '';
1522:      body: JSON.stringify({ type: 'get_state' }),


async function fetchModelInfo() {
  try {
    const [modelsResp, stateResp] = await Promise.all([
      fetch('/api/rpc', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ type: 'get_available_models' }) }),
      fetch('/api/rpc', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ type: 'get_state' }) }),
    ]);
    const modelsData = await modelsResp.json();
    const stateData = await stateResp.json();

    if (modelsData.success && modelsData.data?.models) {
      availableModels = modelsData.data.models;
    }
    if (stateData.success && stateData.data?.model) {
      currentModelId = stateData.data.model.id || '';
      updateModelLabel();

      const model = availableModels.find(m => m.id === currentModelId);
      if (model?.contextWindow) {
        contextWindowSize = model.contextWindow;
        updateTokenUsage();
      }
    }
    if (stateData.success && stateData.data?.thinkingLevel) {
      currentThinkingLevel = stateData.data.thinkingLevel;
      updateThinkingBtn();
    }
  } catch (e) {
    // ignore
  }
}

function updateModelLabel() {
  const shortName = currentModelId.replace(/^claude-/, '').replace(/-\d{8}$/, '');
  modelDropdownLabel.textContent = shortName || 'model';
}

function toggleModelDropdown() {
  const isOpen = !modelDropdownMenu.classList.contains('hidden');
  if (isOpen) {
    closeModelDropdown();

[1079 more lines in file. Use offset=828 to continue.]


edit

const PORT = parseInt(process.env.TAU_PORT || '3001');
const HOME = process.env.HOME || os.homedir();
const SESSIONS_DIR = path.join(HOME, '.pi/agent/sessions');
const INSTANCES_DIR = path.join(HOME, '.pi/tau-instances');

const PORT = parseInt(process.env.TAU_PORT || '3001');
const HOME = process.env.HOME || os.homedir();
const PI_AGENT_DIR = process.env.PI_CODING_AGENT_DIR
  ? path.resolve(process.env.PI_CODING_AGENT_DIR)
  : path.join(HOME, '.pi/agent');
const SESSIONS_DIR = path.join(PI_AGENT_DIR, 'sessions');
const INSTANCES_DIR = path.join(HOME, '.pi/tau-instances');

const browserClients = new Set();
const piClients = new Map(); // sessionId -> ws
const latestStateBySessionId = new Map(); // sessionId -> latest state payload
const latestSessionIdByWs = new WeakMap(); // browser ws -> selected sessionId

    if (cleanPath === '/api/sessions' && req.method === 'GET') {
      const url = new URL(req.url, `http://${req.headers.host}`);
      const statusFilter = url.searchParams.get('status');
      serveSessionsList(res, statusFilter);
      return;
    }

    if (cleanPath === '/api/rpc' && req.method === 'POST') {
      let body = '';
      req.on('data', chunk => { body += chunk; });
      req.on('end', () => {
        try {
          const rpc = body ? JSON.parse(body) : {};
          const sessionIds = Array.from(piClients.keys());
          const targetSessionId = sessionIds[0] || null;
          const state = targetSessionId ? latestStateBySessionId.get(targetSessionId) : null;

          if (rpc.type === 'get_state') {
            res.writeHead(200, { 'Content-Type': 'application/json' });
            res.end(JSON.stringify({ success: true, data: state || null }));
            return;
          }

          if (rpc.type === 'get_available_models') {
            res.writeHead(200, { 'Content-Type': 'application/json' });
            res.end(JSON.stringify({ success: true, data: { models: state?.availableModels || [] } }));
            return;
          }

          if (!targetSessionId || !piClients.get(targetSessionId)) {
            res.writeHead(503, { 'Content-Type': 'application/json' });
            res.end(JSON.stringify({ success: false, error: 'No live Pi session connected' }));
            return;
          }

          if (rpc.type === 'set_model' || rpc.type === 'cycle_thinking_level' || rpc.type === 'set_thinking_level' || rpc.type === 'compact' || rpc.type === 'abort') {
            const client = piClients.get(targetSessionId);
            const forwarded = rpc.type === 'set_model'
              ? { type: 'set_model', model: { provider: rpc.provider, id: rpc.modelId } }
              : rpc.type === 'set_thinking_level'
              ? { type: 'set_thinking_level', level: rpc.level }
              : rpc.type === 'cycle_thinking_level'
              ? { type: 'set_thinking_level', level: nextThinkingLevel(state?.thinkingLevel) }
              : rpc.type === 'compact'
              ? { type: 'prompt', message: '/compact' }
              : { type: 'prompt', message: '\u001b\u001b' };
            client.send(JSON.stringify(forwarded));
            res.writeHead(200, { 'Content-Type': 'application/json' });
            res.end(JSON.stringify({ success: true, data: forwarded.type === 'set_thinking_level' ? { level: forwarded.level } : {} }));
            return;
          }

          res.writeHead(400, { 'Content-Type': 'application/json' });
          res.end(JSON.stringify({ success: false, error: `Unsupported RPC type: ${rpc.type}` }));
        } catch (e) {
          res.writeHead(500, { 'Content-Type': 'application/json' });
          res.end(JSON.stringify({ success: false, error: e.message }));
        }
      });
      return;
    }

wss.on('connection', (ws) => {
  console.log('[Tau Mux] Browser client connected');
  browserClients.add(ws);
  ws.isAlive = true;

  ws.on('pong', () => { ws.isAlive = true; });

  ws.on('close', () => {
    console.log('[Tau Mux] Browser client disconnected');
    browserClients.delete(ws);
  });

  ws.on('error', (e) => {
    browserClients.delete(ws);
  });
});

wss.on('connection', (ws) => {
  console.log('[Tau Mux] Browser client connected');
  browserClients.add(ws);
  ws.isAlive = true;

  const firstSessionId = Array.from(piClients.keys())[0] || null;
  if (firstSessionId) {
    latestSessionIdByWs.set(ws, firstSessionId);
    const state = latestStateBySessionId.get(firstSessionId);
    if (state) {
      try { ws.send(JSON.stringify({ type: 'mirror_sync', ...state })); } catch {}
    }
  }

  ws.on('pong', () => { ws.isAlive = true; });

  ws.on('message', (data) => {
    try {
      const msg = JSON.parse(data.toString());
      const targetSessionId = latestSessionIdByWs.get(ws) || Array.from(piClients.keys())[0] || null;
      const client = targetSessionId ? piClients.get(targetSessionId) : null;
      if (!client || client.readyState !== WebSocket.OPEN) return;
      if (msg.type === 'prompt' || msg.type === 'set_model' || msg.type === 'set_thinking_level' || msg.type === 'abort') {
        client.send(JSON.stringify(msg));
      }
    } catch {}
  });

  ws.on('close', () => {
    console.log('[Tau Mux] Browser client disconnected');
    browserClients.delete(ws);
  });

  ws.on('error', (e) => {
    browserClients.delete(ws);
  });
});

    case 'register':
      piClients.set(msg.sessionId, ws);
      console.log(`[Tau Mux] Registered session: ${msg.sessionId}`);

    case 'state':
      // Update state for this session
      broadcastToBrowsers({ type: 'state_update', sessionId: msg.sessionId, state: msg.state });
      break;

    case 'state':
      latestStateBySessionId.set(msg.sessionId, msg.state);
      broadcastToBrowsers({ type: 'state_update', sessionId: msg.sessionId, state: msg.state });
      break;


Could not find edits[2] in /home/sebas/.npm-global/lib/node_modules/pi-tau-mux-server/src/server.js. The oldText must match exactly including all whitespace and newlines.


bash

grep -n "const PORT\|const browserClients\|/api/sessions\|wss.on('connection'\|case 'state'" /home/sebas/.npm-global/lib/node_modules/pi-tau-mux-server/src/server.js | sed -n '1,80p'


19:const PORT = parseInt(process.env.TAU_PORT || '3001');
49:const browserClients = new Set();
425:  if (cleanPath === '/api/sessions' && req.method === 'GET') {
443:  if (cleanPath === '/api/sessions/switch' && req.method === 'POST') {
449:  // Load session file contents: /api/sessions/:dirName/:fileName
490:wss.on('connection', (ws) => {
579:    case 'state':


const QRCode = require('qrcode');
const os = require('os');
const { execSync } = require('child_process');

// Configuration
const PORT = parseInt(process.env.TAU_PORT || '3001');
const HOME = process.env.HOME || os.homedir();
const SESSIONS_DIR = path.join(HOME, '.pi/agent/sessions');
const INSTANCES_DIR = path.join(HOME, '.pi/tau-instances');

// Static files - look relative to this file or in public dir
const STATIC_DIR = findPublicDir();

function findPublicDir() {
  const candidates = [
    path.join(__dirname, '..', 'public'),
    path.join(__dirname, '..', '..', 'pi-tau-mux', 'public'),
  ];

  for (const dir of candidates) {

[645 more lines in file. Use offset=34 to continue.]


res.writeHead(200, { 'Content-Type': 'application/json' });
    res.end(JSON.stringify({ instances: Array.from(piClients.keys()) }));
    return;
  }

  if (cleanPath === '/api/sessions' && req.method === 'GET') {
    // Parse query parameters (e.g., ?status=active)
    const url = new URL(req.url, `http://${req.headers.host}`);
    const statusFilter = url.searchParams.get('status');
    serveSessionsList(res, statusFilter);
    return;
  }

  if (cleanPath === '/api/qr') {
    const url = getPreferredUrl(PORT);
    QRCode.toDataURL(url, { width: 256, margin: 2 }).then(dataUrl => {
      res.writeHead(200, { 'Content-Type': 'text/html' });
      res.end(`<!DOCTYPE html><meta name="viewport" content="width=device-width">${url}`);
    });
    return;
  }

  // Switch session (no-op in mux mode - just acknowledge)
  if (cleanPath === '/api/sessions/switch' && req.method === 'POST') {
    res.writeHead(200, { 'Content-Type': 'application/json' });
    res.end(JSON.stringify({ success: true }));
    return;
  }

  // Load session file contents: /api/sessions/:dirName/:fileName
  const sessionMatch = urlPath.match(/^\/api\/sessions\/([^/]+)\/(.+)$/);
  if (sessionMatch && req.method === 'GET') {
    const dirName = sessionMatch[1];
    const fileName = sessionMatch[2];
    const sessionFile = path.join(SESSIONS_DIR, dirName, fileName);

    if (!fs.existsSync(sessionFile)) {
      res.writeHead(404, { 'Content-Type': 'application/json' });
      res.end(JSON.stringify({ error: 'Session file not found' }));
      return;

[219 more lines in file. Use offset=460 to continue.]


// WebSocket Server - Browser clients
// ─────────────────────────────────────────────────────────────

const wss = new WebSocketServer({ noServer: true });

wss.on('connection', (ws) => {
  console.log('[Tau Mux] Browser client connected');
  browserClients.add(ws);
  ws.isAlive = true;

  ws.on('pong', () => { ws.isAlive = true; });

  ws.on('close', () => {
    console.log('[Tau Mux] Browser client disconnected');
    browserClients.delete(ws);
  });

  ws.on('error', (e) => {
    browserClients.delete(ws);
  });
});

// ─────────────────────────────────────────────────────────────
// WebSocket Server - Pi client connections
// ─────────────────────────────────────────────────────────────

const wssPi = new WebSocketServer({ noServer: true });

wssPi.on('connection', (ws) => {
  console.log('[Tau Mux] Pi client connected');

  ws.on('message', (data) => {
    try {
      const msg = JSON.parse(data.toString());
      handlePiMessage(ws, msg);
    } catch (e) {
      console.error('[Tau Mux] Failed to parse pi message:', e);
    }
  });

  ws.on('close', () => {
    console.log('[Tau Mux] Pi client disconnected');
    // Remove from piClients
    for (const [sessionId, client] of piClients.entries()) {
      if (client === ws) {
        piClients.delete(sessionId);
        break;
      }
    }
  });
});

server.on('upgrade', (request, socket, head) => {
  if (request.url === '/ws') {
    wss.handleUpgrade(request, socket, head, (ws) => {
      wss.emit('connection', ws, request);
    });
  } else if (request.url === '/pi') {
    wssPi.handleUpgrade(request, socket, head, (ws) => {
      wssPi.emit('connection', ws, request);
    });
  } else {
    socket.destroy();
  }
});

function handlePiMessage(ws, msg) {
  switch (msg.type) {
    case 'register':
      piClients.set(msg.sessionId, ws);

[124 more lines in file. Use offset=555 to continue.]


      console.log(`[Tau Mux] Unregistered session: ${msg.sessionId}`);
      broadcastToBrowsers({ type: 'pi_unregistered', sessionId: msg.sessionId });
      break;

    case 'event':
      // Forward events to browser clients
      broadcastToBrowsers({ type: 'event', event: msg.event });
      break;

    case 'state':
      // Update state for this session
      broadcastToBrowsers({ type: 'state_update', sessionId: msg.sessionId, state: msg.state });
      break;
  }
}

function broadcastToBrowsers(data) {
  const json = JSON.stringify(data);
  for (const client of browserClients) {
    if (client.readyState === WebSocket.OPEN) {
      client.send(json);
    }
  }
}

[84 more lines in file. Use offset=595 to continue.]


**Making small edits**

I’m focusing on making smaller edits to improve clarity. It seems like I might need a helper function called nextThinkingLevel. I'll consider placing that function near the top of my code to streamline the process. This way, I can ensure everything flows better as I make adjustments. Let’s make sure these changes enhance readability and usability without losing any critical information. I'm excited to see how this improves things overall!

edit

const browserClients = new Set();
const piClients = new Map(); // sessionId -> ws
const latestStateBySessionId = new Map(); // sessionId -> latest state payload

function nextThinkingLevel(level) {
  const order = ['off', 'low', 'medium', 'high'];
  const idx = order.indexOf(level || 'off');
  return order[(idx + 1) % order.length];
}

function getPreferredUrl(port) {


Successfully replaced 3 block(s) in /home/sebas/.npm-global/lib/node_modules/pi-tau-mux-server/src/server.js.

     ...
  17
  18 // Configuration
  19 const PORT = parseInt(process.env.TAU_PORT || '3001');
  20 const HOME = process.env.HOME || os.homedir();
- 21 const SESSIONS_DIR = path.join(HOME, '.pi/agent/sessions');
+ 21 const PI_AGENT_DIR = process.env.PI_CODING_AGENT_DIR
+ 22   ? path.resolve(process.env.PI_CODING_AGENT_DIR)
+ 23   : path.join(HOME, '.pi/agent');
+ 24 const SESSIONS_DIR = path.join(PI_AGENT_DIR, 'sessions');
  22 const INSTANCES_DIR = path.join(HOME, '.pi/tau-instances');
  23
  24 // Static files - look relative to this file or in public dir
  25 const STATIC_DIR = findPublicDir();
     ...
  47
  48 // State
  49 const browserClients = new Set();
  50 const piClients = new Map(); // sessionId -> ws
+ 54 const latestStateBySessionId = new Map(); // sessionId -> latest state payload
  51
  52 // MIME types
  53 const MIME_TYPES = {
  54   '.html': 'text/html',
     ...
 108
 109   return null;
 110 }
 111
+116 function nextThinkingLevel(level) {
+117   const order = ['off', 'low', 'medium', 'high'];
+118   const idx = order.indexOf(level || 'off');
+119   return order[(idx + 1) % order.length];
+120 }
+121
 112 function getPreferredUrl(port) {
 113   // Prefer Tailscale hostname (works across devices on same tailnet)
 114   if (tailscaleInfo?.hostname) {
 115     return `http://${tailscaleInfo.hostname}:${port}`;
     ...


  if (cleanPath === '/api/sessions' && req.method === 'GET') {
    // Parse query parameters (e.g., ?status=active)
    const url = new URL(req.url, `http://${req.headers.host}`);
    const statusFilter = url.searchParams.get('status');
    serveSessionsList(res, statusFilter);
    return;
  }

  if (cleanPath === '/api/qr') {

  if (cleanPath === '/api/sessions' && req.method === 'GET') {
    // Parse query parameters (e.g., ?status=active)
    const url = new URL(req.url, `http://${req.headers.host}`);
    const statusFilter = url.searchParams.get('status');
    serveSessionsList(res, statusFilter);
    return;
  }

  if (cleanPath === '/api/rpc' && req.method === 'POST') {
    let body = '';
    req.on('data', chunk => { body += chunk; });
    req.on('end', () => {
      try {
        const rpc = body ? JSON.parse(body) : {};
        const targetSessionId = Array.from(piClients.keys())[0] || null;
        const state = targetSessionId ? latestStateBySessionId.get(targetSessionId) : null;

        if (rpc.type === 'get_state') {
          res.writeHead(200, { 'Content-Type': 'application/json' });
          res.end(JSON.stringify({ success: true, data: state || null }));
          return;
        }

        if (rpc.type === 'get_available_models') {
          res.writeHead(200, { 'Content-Type': 'application/json' });
          res.end(JSON.stringify({ success: true, data: { models: [] } }));
          return;
        }

        const client = targetSessionId ? piClients.get(targetSessionId) : null;
        if (!client || client.readyState !== WebSocket.OPEN) {
          res.writeHead(503, { 'Content-Type': 'application/json' });
          res.end(JSON.stringify({ success: false, error: 'No live Pi session connected' }));
          return;
        }

        let forwarded = null;
        if (rpc.type === 'set_model') forwarded = { type: 'set_model', model: { provider: rpc.provider, id: rpc.modelId } };
        if (rpc.type === 'set_thinking_level') forwarded = { type: 'set_thinking_level', level: rpc.level };
        if (rpc.type === 'cycle_thinking_level') forwarded = { type: 'set_thinking_level', level: nextThinkingLevel(state?.thinkingLevel) };
        if (rpc.type === 'compact') forwarded = { type: 'prompt', message: '/compact' };
        if (rpc.type === 'abort') forwarded = { type: 'prompt', message: '\u001b\u001b' };

        if (!forwarded) {
          res.writeHead(400, { 'Content-Type': 'application/json' });
          res.end(JSON.stringify({ success: false, error: `Unsupported RPC type: ${rpc.type}` }));
          return;
        }

        client.send(JSON.stringify(forwarded));
        res.writeHead(200, { 'Content-Type': 'application/json' });
        res.end(JSON.stringify({ success: true, data: forwarded.level ? { level: forwarded.level } : {} }));
      } catch (e) {
        res.writeHead(500, { 'Content-Type': 'application/json' });
        res.end(JSON.stringify({ success: false, error: e.message }));
      }
    });
    return;
  }

  if (cleanPath === '/api/qr') {


Successfully replaced 1 block(s) in /home/sebas/.npm-global/lib/node_modules/pi-tau-mux-server/src/server.js.

     ...
 438     const statusFilter = url.searchParams.get('status');
 439     serveSessionsList(res, statusFilter);
 440     return;
 441   }
+442
+443   if (cleanPath === '/api/rpc' && req.method === 'POST') {
+444     let body = '';
+445     req.on('data', chunk => { body += chunk; });
+446     req.on('end', () => {
+447       try {
+448         const rpc = body ? JSON.parse(body) : {};
+449         const targetSessionId = Array.from(piClients.keys())[0] || null;
+450         const state = targetSessionId ? latestStateBySessionId.get(targetSessionId) : null;
+451
+452         if (rpc.type === 'get_state') {
+453           res.writeHead(200, { 'Content-Type': 'application/json' });
+454           res.end(JSON.stringify({ success: true, data: state || null }));
+455           return;
+456         }
+457
+458         if (rpc.type === 'get_available_models') {
+459           res.writeHead(200, { 'Content-Type': 'application/json' });
+460           res.end(JSON.stringify({ success: true, data: { models: [] } }));
+461           return;
+462         }
+463
+464         const client = targetSessionId ? piClients.get(targetSessionId) : null;
+465         if (!client || client.readyState !== WebSocket.OPEN) {
+466           res.writeHead(503, { 'Content-Type': 'application/json' });
+467           res.end(JSON.stringify({ success: false, error: 'No live Pi session connected' }));
+468           return;
+469         }
+470
+471         let forwarded = null;
+472         if (rpc.type === 'set_model') forwarded = { type: 'set_model', model: { provider: rpc.provider, id: rpc.modelId } };
+473         if (rpc.type === 'set_thinking_level') forwarded = { type: 'set_thinking_level', level: rpc.level };
+474         if (rpc.type === 'cycle_thinking_level') forwarded = { type: 'set_thinking_level', level: nextThinkingLevel(state?.thinkingLevel) };
+475         if (rpc.type === 'compact') forwarded = { type: 'prompt', message: '/compact' };
+476         if (rpc.type === 'abort') forwarded = { type: 'prompt', message: '\u001b\u001b' };
+477
+478         if (!forwarded) {
+479           res.writeHead(400, { 'Content-Type': 'application/json' });
+480           res.end(JSON.stringify({ success: false, error: `Unsupported RPC type: ${rpc.type}` }));
+481           return;
+482         }
+483
+484         client.send(JSON.stringify(forwarded));
+485         res.writeHead(200, { 'Content-Type': 'application/json' });
+486         res.end(JSON.stringify({ success: true, data: forwarded.level ? { level: forwarded.level } : {} }));
+487       } catch (e) {
+488         res.writeHead(500, { 'Content-Type': 'application/json' });
+489         res.end(JSON.stringify({ success: false, error: e.message }));
+490       }
+491     });
+492     return;
+493   }
 442
 443   if (cleanPath === '/api/qr') {
 444     const url = getPreferredUrl(PORT);
 445     QRCode.toDataURL(url, { width: 256, margin: 2 }).then(dataUrl => {
     ...


wss.on('connection', (ws) => {
  console.log('[Tau Mux] Browser client connected');
  browserClients.add(ws);
  ws.isAlive = true;

  const firstSessionId = Array.from(piClients.keys())[0] || null;
  if (firstSessionId) {
    const state = latestStateBySessionId.get(firstSessionId);
    if (state) {
      try { ws.send(JSON.stringify({ type: 'mirror_sync', ...state })); } catch {}
    }
  }

  ws.on('pong', () => { ws.isAlive = true; });

  ws.on('message', (data) => {
    try {
      const msg = JSON.parse(data.toString());
      const targetSessionId = Array.from(piClients.keys())[0] || null;
      const client = targetSessionId ? piClients.get(targetSessionId) : null;
      if (!client || client.readyState !== WebSocket.OPEN) return;
      if (msg.type === 'prompt' || msg.type === 'set_model' || msg.type === 'set_thinking_level' || msg.type === 'abort') {
        client.send(JSON.stringify(msg));
      }
    } catch {}
  });

  ws.on('close', () => {
    console.log('[Tau Mux] Browser client disconnected');
    browserClients.delete(ws);
  });

  ws.on('error', (e) => {
    browserClients.delete(ws);
  });
});


Successfully replaced 2 block(s) in /home/sebas/.npm-global/lib/node_modules/pi-tau-mux-server/src/server.js.

     ...
 552 wss.on('connection', (ws) => {
 553   console.log('[Tau Mux] Browser client connected');
 554   browserClients.add(ws);
 555   ws.isAlive = true;
+556
+557   const firstSessionId = Array.from(piClients.keys())[0] || null;
+558   if (firstSessionId) {
+559     const state = latestStateBySessionId.get(firstSessionId);
+560     if (state) {
+561       try { ws.send(JSON.stringify({ type: 'mirror_sync', ...state })); } catch {}
+562     }
+563   }
 556
 557   ws.on('pong', () => { ws.isAlive = true; });
+566
+567   ws.on('message', (data) => {
+568     try {
+569       const msg = JSON.parse(data.toString());
+570       const targetSessionId = Array.from(piClients.keys())[0] || null;
+571       const client = targetSessionId ? piClients.get(targetSessionId) : null;
+572       if (!client || client.readyState !== WebSocket.OPEN) return;
+573       if (msg.type === 'prompt' || msg.type === 'set_model' || msg.type === 'set_thinking_level' || msg.type === 'abort') {
+574         client.send(JSON.stringify(msg));
+575       }
+576     } catch {}
+577   });
 558
 559   ws.on('close', () => {
 560     console.log('[Tau Mux] Browser client disconnected');
 561     browserClients.delete(ws);
     ...
 638       broadcastToBrowsers({ type: 'event', event: msg.event });
 639       break;
 640
 641     case 'state':
-642       // Update state for this session
+662       latestStateBySessionId.set(msg.sessionId, msg.state);
 643       broadcastToBrowsers({ type: 'state_update', sessionId: msg.sessionId, state: msg.state });
 644       break;
 645   }
 646 }
     ...


**Restarting server and reconnecting**

I think I need to restart the server and possibly reconnect the Pi session. I'm wondering if the server has enough capacity to handle everything. If I need to reconnect the Pi client, it seems like a good idea, especially if the connection is closed. So, yeah, let's go ahead and restart the server to see if that resolves any issues!

bash

pkill -f 'pi-tau-mux-server' || true
sleep 1
nohup env PI_CODING_AGENT_DIR=/mnt/rpi/pi-config pi-tau-mux-server >/tmp/pi-tau-mux-test/server.log 2>&1 & echo $!
sleep 2
tail -40 /tmp/pi-tau-mux-test/server.log

tmux send-keys -t tau-test:0 C-c ''
sleep 1
tmux send-keys -t tau-test:0 'pi' Enter
sleep 6
tmux capture-pane -pt tau-test:0 | tail -40


(no output)


 Hi.

 pi

 Considering how to greet

 The user mentioned "pi," which could be a playful way to test me or maybe just
 looking for a friendly acknowledgment. I should respond directly and keep my
 tone light and engaging. Maybe I can say something like, "Hi there! Is there
 something specific about pi you’d like to know?" That way, I'm opening the
 door for further conversation while also responding to their cue. Let's keep
 it friendly!

 Yes.

────────────────────────────────────────────────────────────────────────────────

────────────────────────────────────────────────────────────────────────────────
/tmp/pi-tau-mux-test/project-a
↑8.1k ↓38 $0.021 (sub) 1.5%/272k (auto)         (openai-codex) gpt-5.4 • minimal


ps -ef | grep '[p]i-tau-mux-server'
printf '\n---\n'
curl -fsSL http://127.0.0.1:3001/api/health
printf '\n---\n'
curl -fsSL 'http://127.0.0.1:3001/api/sessions?status=active' | head -c 4000


---
curl: (7) Failed to connect to 127.0.0.1 port 3001 after 0 ms: Could not connect to server

---
curl: (7) Failed to connect to 127.0.0.1 port 3001 after 0 ms: Could not connect to server


[Tau Mux] 🐺 Tailscale detected (sebastianfavaron@gmail.com)
[Tau Mux] MagicDNS: http://ballbox-first.emperor-ratio.ts.net:3001
[Tau Mux] Tailscale IP: http://100.116.176.16:3001
[Tau Mux] Local: http://192.168.1.33:3001
[Tau Mux] WebSocket endpoints: /ws (browser), /pi (pi clients)
[Tau Mux] Pi client connected
[Tau Mux] Registered session: 2026-04-29T16-49-04-845Z_019dda24-e74d-72aa-8f07-5b90064db8f0
[Tau Mux] Browser client connected
[Tau Mux] Browser client disconnected
[Tau Mux] Browser client connected
[Tau Mux] Browser client disconnected
[Tau Mux] Browser client connected
[Tau Mux] Browser client connected
[Tau Mux] Browser client disconnected
[Tau Mux] Browser client disconnected
[Tau Mux] Browser client connected


**Troubleshooting server issues**

I'm thinking the server might have died after the initial log due to a syntax error, since there's no output from the process. I need to check for node errors too. I tried tailing logs but nothing showed up. There's a chance nohup might have died silently. Maybe I should run the node command in the foreground or set a timeout? Also, checking the syntax with `node -c` might help catch any errors.


nohup env PI_CODING_AGENT_DIR=/mnt/rpi/pi-config pi-tau-mux-server >/tmp/pi-tau-mux-test/server.log 2>&1 < /dev/null & echo $! && sleep 2 && ps -fp $! && curl -fsSL http://127.0.0.1:3001/api/health


2512798
UID          PID    PPID  C STIME TTY          TIME CMD
sebas    2512798 2512797  3 14:04 ?        00:00:00 node /home/sebas/.npm-global/bin/pi-tau-mux-server
{"status":"ok","mode":"mux","browserClients":0,"piClients":0,"tailscale":{"ip":"100.116.176.16","hostname":"ballbox-first.emperor-ratio.ts.net","tailnet":"sebastianfavaron@gmail.com"}}


sleep 7; curl -fsSL http://127.0.0.1:3001/api/health; printf '\n---\n'; curl -fsSL 'http://127.0.0.1:3001/api/sessions?status=active' | head -c 4000; printf '\n---\n'; tail -40 /tmp/pi-tau-mux-test/server.log


{"status":"ok","mode":"mux","browserClients":1,"piClients":1,"tailscale":{"ip":"100.116.176.16","hostname":"ballbox-first.emperor-ratio.ts.net","tailnet":"sebastianfavaron@gmail.com"}}
---
{"projects":[{"path":"--home-sebas--","dirName":"--home-sebas--","sessions":[{"id":"019dd9f1-6695-771d-9d52-30c876acff7a","timestamp":"2026-04-29T15:52:49.558Z","name":null,"firstMessage":"can you see pi-side-agents extension full codebase locally?","cwd":"/home/sebas","file":"2026-04-29T15-52-49-558Z_019dd9f1-6695-771d-9d52-30c876acff7a.jsonl","filePath":"/mnt/rpi/pi-config/sessions/--home-sebas--/2026-04-29T15-52-49-558Z_019dd9f1-6695-771d-9d52-30c876acff7a.jsonl","mtime":1777482248487.4976,"isRecentlyModified":true,"status":"active","dirName":"--home-sebas--","decodedCwd":"/home/sebas","decodedPaneId":null}],"displayName":"sebas-1","cwd":"/home/sebas"},{"path":"--tmp-pi-tau-mux-test-project-a--","dirName":"--tmp-pi-tau-mux-test-project-a--","sessions":[{"id":"019dda24-e74d-72aa-8f07-5b90064db8f0","timestamp":"2026-04-29T16:49:04.845Z","name":null,"firstMessage":"hello","cwd":"/tmp/pi-tau-mux-test/project-a","file":"2026-04-29T16-49-04-845Z_019dda24-e74d-72aa-8f07-5b90064db8f0.jsonl","filePath":"/mnt/rpi/pi-config/sessions/--tmp-pi-tau-mux-test-project-a--/2026-04-29T16-49-04-845Z_019dda24-e74d-72aa-8f07-5b90064db8f0.jsonl","mtime":1777482220843.3823,"isRecentlyModified":true,"status":"active","dirName":"--tmp-pi-tau-mux-test-project-a--","decodedCwd":"/tmp/pi/tau/mux/test/project/a","decodedPaneId":null}],"displayName":"a","cwd":"/tmp/pi/tau/mux/test/project/a"}]}
---
[Tau Mux] 🐺 Tailscale detected (sebastianfavaron@gmail.com)
[Tau Mux] MagicDNS: http://ballbox-first.emperor-ratio.ts.net:3001
[Tau Mux] Tailscale IP: http://100.116.176.16:3001
[Tau Mux] Local: http://192.168.1.33:3001
[Tau Mux] WebSocket endpoints: /ws (browser), /pi (pi clients)
[Tau Mux] Browser client connected
[Tau Mux] Pi client connected
[Tau Mux] Registered session: 2026-04-29T16-49-04-845Z_019dda24-e74d-72aa-8f07-5b90064db8f0


node <<'EOF'
const WebSocket = require('ws');
const ws = new WebSocket('ws://127.0.0.1:3001/ws');
ws.on('open', () => {
  ws.send(JSON.stringify({type:'prompt', message:'say exactly BROWSER_OK'}));
  setTimeout(()=>ws.close(), 2000);
});
ws.on('message', d => process.stdout.write(d.toString()+"\n"));
setTimeout(()=>process.exit(0), 5000);
EOF
sleep 8
tmux capture-pane -pt tau-test:0 | tail -100


node:internal/modules/cjs/loader:1386
  throw err;
  ^

Error: Cannot find module 'ws'
Require stack:
- /home/sebas/[stdin]
    at Function._resolveFilename (node:internal/modules/cjs/loader:1383:15)
    at defaultResolveImpl (node:internal/modules/cjs/loader:1025:19)
    at resolveForCJSWithHooks (node:internal/modules/cjs/loader:1030:22)
    at Function._load (node:internal/modules/cjs/loader:1192:37)
    at TracingChannel.traceSync (node:diagnostics_channel:328:14)
    at wrapModuleLoad (node:internal/modules/cjs/loader:237:24)
    at Module.require (node:internal/modules/cjs/loader:1463:12)
    at require (node:internal/modules/helpers:147:16)
    at [stdin]:1:19
    at runScriptInThisContext (node:internal/vm:209:10) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ '/home/sebas/[stdin]' ]
}

Node.js v22.22.0

 pi

 Considering how to greet

 The user mentioned "pi," which could be a playful way to test me or maybe just
 looking for a friendly acknowledgment. I should respond directly and keep my
 tone light and engaging. Maybe I can say something like, "Hi there! Is there
 something specific about pi you’d like to know?" That way, I'm opening the
 door for further conversation while also responding to their cue. Let's keep
 it friendly!

 Yes.

 Connected to Tau mux server at Tailscale  •  View UI at
 http://100.116.176.16:3001

────────────────────────────────────────────────────────────────────────────────

────────────────────────────────────────────────────────────────────────────────
/tmp/pi-tau-mux-test/project-a
↑8.1k ↓38 $0.021 (sub) 1.5%/272k (auto)         (openai-codex) gpt-5.4 • minimal


**Exploring WebSocket Options**

I’m considering whether to use Python's WebSocket library or if websocat is not available. Using a browser seems impossible for this task. I’m thinking about curl, but that's not suitable either. Maybe I could install wscat, but it might not be necessary. Another option is to use Node.js with the ws module from the package path. There’s quite a bit to weigh here in terms of what's actually needed!

node <<'EOF'
const WebSocket = require('/home/sebas/.npm-global/lib/node_modules/pi-tau-mux-server/node_modules/ws');
const ws = new WebSocket('ws://127.0.0.1:3001/ws');
ws.on('open', () => {
  console.log('OPEN');
  ws.send(JSON.stringify({type:'prompt', message:'say exactly BROWSER_OK'}));
  setTimeout(()=>ws.close(), 1500);
});
ws.on('message', d => console.log('MSG', d.toString().slice(0,200)));
ws.on('error', e => console.error('ERR', e.message));
setTimeout(()=>process.exit(0), 5000);
EOF
sleep 10
tmux capture-pane -pt tau-test:0 | tail -120


OPEN
MSG {"type":"mirror_sync","entries":[{"type":"model_change","id":"cbea0780","parentId":null,"timestamp":"2026-04-29T16:49:06.686Z","provider":"openai-codex","modelId":"gpt-5.4"},{"type":"thinking_level_ch
MSG {"type":"event","event":{"type":"agent_start"}}
MSG {"type":"event","event":{"type":"turn_start","turnIndex":0,"timestamp":1777482283952}}
MSG {"type":"event","event":{"type":"message_start","message":{"role":"user","content":[{"type":"text","text":"say exactly BROWSER_OK"}],"timestamp":1777482283947}}}
MSG {"type":"event","event":{"type":"message_end","message":{"role":"user","content":[{"type":"text","text":"say exactly BROWSER_OK"}],"timestamp":1777482283947}}}
MSG {"type":"event","event":{"type":"message_start","message":{"role":"assistant","content":[],"api":"openai-codex-responses","provider":"openai-codex","model":"gpt-5.4","usage":{"input":0,"output":0,"cac
 looking for a friendly acknowledgment. I should respond directly and keep my
 tone light and engaging. Maybe I can say something like, "Hi there! Is there
 something specific about pi you’d like to know?" That way, I'm opening the
 door for further conversation while also responding to their cue. Let's keep
 it friendly!

 Yes.

 Connected to Tau mux server at Tailscale  •  View UI at
 http://100.116.176.16:3001

 say exactly BROWSER_OK

 BROWSER_OK

────────────────────────────────────────────────────────────────────────────────

────────────────────────────────────────────────────────────────────────────────
/tmp/pi-tau-mux-test/project-a
↑8.6k ↓45 R3.6k $0.023 (sub) 1.5%/272k (auto)   (openai-codex) gpt-5.4 • minimal


Patched enough to verify usefulness.

What I fixed locally:
- session scan now respects `PI_CODING_AGENT_DIR=/mnt/rpi/pi-config`
- browser now gets initial live session sync
- browser prompt messages now forward to live Pi session
- minimal `/api/rpc` exists for current state + basic actions

Verified:
- session list now shows projects/sessions
- browser-to-Pi prompting works
- I sent `say exactly BROWSER_OK` through websocket path
- Pi answered `BROWSER_OK`

So Tau is now **meaningfully testable** here.

What is still rough:
- model list is still limited / likely empty
- slash UI is still **not native Pi slash UX**
- this is a quick local patch, not a proper fix

What you should do:
- **hard refresh** browser on:
  - `http://100.116.176.16:3001`
  - or `http://ballbox-first.emperor-ratio.ts.net:3001`
- then try selecting the active session in sidebar
- then send a normal prompt

Expected now:
- chat should work
- session list should appear

Not expected:
- full native `/` command menu
- polished model picker

If you want, next I can:
1. patch model list too
2. make this fix durable as a local fork/PR
3. help you test whether Tau is good enough UX-wise to keep exploring


what was the patch?


Quick local patch in `pi-tau-mux-server/src/server.js`.

## 1. Fix session root
Changed session scanning from hardcoded:

- `~/.pi/agent/sessions`

to:

- `${PI_CODING_AGENT_DIR}/sessions` if set
- else fallback to `~/.pi/agent/sessions`

This fixed empty sidebar/history on this machine.

## 2. Keep latest live Pi state in server
Added in-memory cache of latest session state per connected Pi session.

Used for:
- initial browser sync
- `get_state` style responses

## 3. Send browser an initial live session snapshot
When browser connects to `/ws`, server now immediately sends:
- `mirror_sync` with latest known live Pi state

This makes browser land on a real active session instead of half-empty UI.

## 4. Forward browser prompts to live Pi session
Before, browser websocket mostly received events.
Now browser messages like:
- `{ type: "prompt", message: "..." }`

get forwarded to connected Pi client.

That’s what made:
- `say exactly BROWSER_OK`
work.

## 5. Add minimal `/api/rpc`
Added quick support for:
- `get_state`
- `get_available_models` (currently stub/empty)
- `set_model`
- `set_thinking_level`
- `cycle_thinking_level`
- `compact`
- `abort`

This was just enough so UI pieces don’t totally fail.

## Important
This was a **fast verification patch**, not a clean production patch.

Still rough:
- model picker likely incomplete
- command palette is Tau’s own, not Pi’s native slash system
- session targeting is primitive: basically first live session

If you want, I can dump the exact diff next.


cant see how to make new sessions


Yes. Likely not supported well in this setup.

What Tau seems to be good at:
- **mirror/control existing Pi sessions**
- browse session history
- switch among live sessions

What it does **not** seem built for:
- creating new Pi sessions/projects cleanly from the web UI

So current shape is probably:

1. start Pi session elsewhere
   - ideally in tmux
2. Tau discovers/mirrors it
3. browser controls that existing session

That means if your product need is:
- “open browser, create/manage project sessions there”

then Tau is still weak.

## Practical workaround
For now, new session creation would be:

- create tmux window/session manually
- `cd <project>`
- run `pi`
- Tau picks it up

## Verdict
This is important:
- Tau may be useful as a **viewer/controller**
- but maybe not enough as the full **hosted client**

So Path B with Tau is only partially validated.

Best next question is:
- is “manual create, browser supervise” acceptable?
- or do you need “browser can create/open/manage sessions” as a must?

If it’s a must, then Tau may still fail your use case even after patching.

If you want, I can now:
1. inspect whether Tau can be extended quickly to create sessions
2. try `pi-remote` as alternative
3. compare Tau vs pi-remote specifically on “create/open/manage project sessions from browser”


do new(the one you made)/prev sessions persist even if i disconnect?


Yes, **if the Pi session itself keeps running**.

In our current setup:
- Pi runs in **tmux**
- Tau browser is just a client/mirror

So if you disconnect browser:
- **session persists**
- reconnect later, session should still be there

Same if SSH drops:
- **tmux keeps Pi alive**
- Tau can reconnect to that live Pi later

But important split:

## Persists
- live Pi process in tmux
- session file/history on disk
- Tau server process, if left running

## Does not create persistence by itself
- browser tab
- browser-side UI state
- any session not actually backed by a running Pi process

So for:
- **new session I made in tmux** → yes, persists across disconnects
- **previous sessions on disk** → yes, history persists
- **live ability to continue them** → yes if Pi still running; otherwise you can at least reopen history, and maybe resume by starting Pi again on that session

Short:
- **disconnect-safe: yes**
- because tmux owns the real process, not the browser.


but are all sessions running in tmux now? sure?


**Reviewing test sessions**

I need to approach this carefully. We have the test session "tau-test" in tmux. However, I'm considering that other sessions from the API list may include "current" or "/home/sebas," which might not be in tmux. It's important to be explicit about that distinction. I'll clarify which sessions are in tmux and which aren't to ensure I provide accurate information.

No. **Not all.**

What I know for sure:
- the **test session** I created for Tau is running in tmux:
  - session: `tau-test`
  - cwd: `/tmp/pi-tau-mux-test/project-a`

What I do **not** know:
- that every other Pi session on this machine is tmux-backed
- especially the `/home/sebas` session shown by Tau

Tau shows:
- session files/history
- live connected Pi clients

That is **not the same** as “all are in tmux”.

So current truth is:

- **test Tau session**: yes, tmux-backed
- **other sessions**: unknown unless checked one by one

If you want, I can audit all live Pi processes now and tell you:
- which are in tmux
- which are not
- which session file each maps to.