diff --git a/tools/chrome-cookie-exporter/README.md b/tools/chrome-cookie-exporter/README.md
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+# Chrome Cookie Exporter
+
+Minimal Chrome extension for copying the auth values this project needs.
+
+## What it copies
+
+1. `cookie.txt`: combined Yandex cookies for Calendar access
+2. `.env` lines: `TIME_TEAM_ID`, `TIME_COOKIE`, and `TIME_CSRF`
+3. `ktalk_auth.txt`: the exact `Authorization` header value from a KTalk request
+
+## Load in Chrome
+
+1. Open `chrome://extensions`
+2. Enable Developer mode
+3. Click Load unpacked
+4. Select `tools/chrome-cookie-exporter`
+
+## Use
+
+1. Sign in to `calendar.yandex.ru`, `time.cu.ru`, and `centraluniversity.ktalk.ru`
+2. Open the extension popup
+3. For Time, open a space/channel page so the app sends a `/api/v4/teams/.../channels/...` request
+4. Click the button you need
+5. Paste the copied value into the matching local file or `.env`
+
+## Notes
+
+- The extension only reads cookies from the three target services.
+- Time team id is taken from observed `time.cu.ru/api/v4/teams/.../channels/...` request URLs.
+- KTalk auth is taken from the real `Authorization` request header and copied as-is, including the `Session` prefix.
+- If Time CSRF is missing, refresh `time.cu.ru` after login and try again.
diff --git a/tools/chrome-cookie-exporter/background.js b/tools/chrome-cookie-exporter/background.js
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+const KTALK_URL_PATTERN = "https://centraluniversity.ktalk.ru/*";
+const TIME_API_URL_PATTERN = "https://time.cu.ru/api/v4/teams/*";
+
+chrome.webRequest.onBeforeSendHeaders.addListener(
+  (details) => {
+    const authorizationHeader = details.requestHeaders?.find(
+      (header) => header.name.toLowerCase() === "authorization"
+    );
+
+    if (!authorizationHeader?.value) {
+      return;
+    }
+
+    chrome.storage.local.set({ ktalkAuthorization: authorizationHeader.value });
+  },
+  { urls: [KTALK_URL_PATTERN] },
+  ["requestHeaders"]
+);
+
+chrome.webRequest.onBeforeRequest.addListener(
+  (details) => {
+    const match = details.url.match(/\/api\/v4\/teams\/([^/]+)\/channels/i);
+    if (!match) {
+      return;
+    }
+
+    chrome.storage.local.set({ timeTeamId: match[1] });
+  },
+  { urls: [TIME_API_URL_PATTERN] }
+);
diff --git a/tools/chrome-cookie-exporter/manifest.json b/tools/chrome-cookie-exporter/manifest.json
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+{
+  "manifest_version": 3,
+  "name": "CU Cookie Exporter",
+  "version": "0.1.0",
+  "description": "Copy required Yandex Calendar, Time, and KTalk auth values.",
+  "permissions": ["cookies", "clipboardWrite", "storage", "webRequest"],
+  "host_permissions": [
+    "https://calendar.yandex.ru/*",
+    "https://yandex.ru/*",
+    "https://passport.yandex.ru/*",
+    "https://time.cu.ru/*",
+    "https://centraluniversity.ktalk.ru/*"
+  ],
+  "action": {
+    "default_title": "CU Cookie Exporter",
+    "default_popup": "popup.html"
+  },
+  "background": {
+    "service_worker": "background.js"
+  }
+}
diff --git a/tools/chrome-cookie-exporter/popup.css b/tools/chrome-cookie-exporter/popup.css
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+++ b/tools/chrome-cookie-exporter/popup.css
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+body {
+  margin: 0;
+  background: #111827;
+  color: #e5e7eb;
+  font: 14px/1.4 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+}
+
+.popup {
+  width: 340px;
+  padding: 16px;
+}
+
+h1 {
+  margin: 0 0 8px;
+  font-size: 18px;
+}
+
+.hint {
+  margin: 0 0 12px;
+  color: #9ca3af;
+}
+
+button {
+  display: block;
+  width: 100%;
+  margin: 0 0 10px;
+  padding: 10px 12px;
+  border: 0;
+  border-radius: 8px;
+  background: #2563eb;
+  color: #fff;
+  font: inherit;
+  cursor: pointer;
+}
+
+button:hover {
+  background: #1d4ed8;
+}
+
+.status {
+  margin: 6px 0 0;
+  padding: 10px;
+  min-height: 84px;
+  overflow: auto;
+  white-space: pre-wrap;
+  word-break: break-word;
+  border-radius: 8px;
+  background: #0b1220;
+  color: #cbd5e1;
+}
diff --git a/tools/chrome-cookie-exporter/popup.html b/tools/chrome-cookie-exporter/popup.html
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+++ b/tools/chrome-cookie-exporter/popup.html
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+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title>CU Cookie Exporter</title>
+    <link rel="stylesheet" href="popup.css">
+  </head>
+  <body>
+    <main class="popup">
+      <h1>CU Cookie Exporter</h1>
+      <p class="hint">Open the three services in Chrome first so their cookies are available.</p>
+
+      <button id="copy-yandex" type="button">Copy Yandex `cookie.txt`</button>
+      <button id="copy-time" type="button">Copy Time `.env` lines</button>
+      <button id="copy-ktalk" type="button">Copy KTalk `ktalk_auth.txt`</button>
+
+      <pre id="status" class="status">Ready.</pre>
+    </main>
+
+    <script src="popup.js"></script>
+  </body>
+</html>
diff --git a/tools/chrome-cookie-exporter/popup.js b/tools/chrome-cookie-exporter/popup.js
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+++ b/tools/chrome-cookie-exporter/popup.js
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+const statusEl = document.getElementById("status");
+
+const YANDEX_URLS = [
+  "https://calendar.yandex.ru/",
+  "https://yandex.ru/",
+  "https://passport.yandex.ru/"
+];
+
+const TIME_URL = "https://time.cu.ru/";
+const KTALK_URL = "https://centraluniversity.ktalk.ru/";
+
+function setStatus(message) {
+  statusEl.textContent = message;
+}
+
+function getAllCookies(details) {
+  return new Promise((resolve, reject) => {
+    chrome.cookies.getAll(details, (cookies) => {
+      if (chrome.runtime.lastError) {
+        reject(new Error(chrome.runtime.lastError.message));
+        return;
+      }
+      resolve(cookies);
+    });
+  });
+}
+
+function getCookie(details) {
+  return new Promise((resolve, reject) => {
+    chrome.cookies.get(details, (cookie) => {
+      if (chrome.runtime.lastError) {
+        reject(new Error(chrome.runtime.lastError.message));
+        return;
+      }
+      resolve(cookie);
+    });
+  });
+}
+
+async function copyText(text) {
+  await navigator.clipboard.writeText(text);
+}
+
+function getStorageValue(key) {
+  return new Promise((resolve, reject) => {
+    chrome.storage.local.get([key], (result) => {
+      if (chrome.runtime.lastError) {
+        reject(new Error(chrome.runtime.lastError.message));
+        return;
+      }
+      resolve(result[key] || null);
+    });
+  });
+}
+
+function joinCookieString(cookies) {
+  return cookies.map((cookie) => `${cookie.name}=${cookie.value}`).join("; ");
+}
+
+async function loadYandexCookies() {
+  const cookieMap = new Map();
+  for (const url of YANDEX_URLS) {
+    const cookies = await getAllCookies({ url });
+    for (const cookie of cookies) {
+      cookieMap.set(cookie.name, cookie);
+    }
+  }
+
+  const cookies = [...cookieMap.values()].sort((left, right) => left.name.localeCompare(right.name));
+  if (!cookies.length) {
+    throw new Error("No Yandex cookies found. Open Yandex Calendar and sign in first.");
+  }
+
+  return joinCookieString(cookies);
+}
+
+function pickCsrfToken(cookies) {
+  const exactNames = ["csrftoken", "csrf", "x-csrf-token", "XSRF-TOKEN", "xsrf-token"];
+  for (const name of exactNames) {
+    const match = cookies.find((cookie) => cookie.name === name);
+    if (match) {
+      return match.value;
+    }
+  }
+
+  const fuzzyMatch = cookies.find((cookie) => /csrf|xsrf/i.test(cookie.name));
+  return fuzzyMatch ? fuzzyMatch.value : null;
+}
+
+async function loadTimeEnvLines() {
+  const cookies = await getAllCookies({ url: TIME_URL });
+  if (!cookies.length) {
+    throw new Error("No Time cookies found. Open time.cu.ru and sign in first.");
+  }
+
+  const teamId = await getStorageValue("timeTeamId");
+  if (!teamId) {
+    throw new Error(
+      "No Time team id captured yet. Open a space in time.cu.ru so it sends a /api/v4/teams/.../channels request."
+    );
+  }
+
+  const csrfValue = pickCsrfToken(cookies);
+  if (!csrfValue) {
+    throw new Error("Could not find a Time CSRF cookie. Open the app and refresh once.");
+  }
+
+  return `TIME_TEAM_ID=${teamId}\nTIME_COOKIE=${joinCookieString(cookies)}\nTIME_CSRF=${csrfValue}`;
+}
+
+async function loadKTalkAuth() {
+  const token = await getStorageValue("ktalkAuthorization");
+  if (!token) {
+    throw new Error(
+      "No KTalk Authorization header captured yet. Open KTalk, trigger any API request, then try again."
+    );
+  }
+
+  return token;
+}
+
+async function runCopy(loader, successMessage) {
+  setStatus("Reading browser cookies...");
+  try {
+    const text = await loader();
+    await copyText(text);
+    setStatus(`${successMessage}\n\n${text}`);
+  } catch (error) {
+    setStatus(error instanceof Error ? error.message : String(error));
+  }
+}
+
+document.getElementById("copy-yandex").addEventListener("click", () => {
+  runCopy(loadYandexCookies, "Copied Yandex cookie string for cookie.txt.");
+});
+
+document.getElementById("copy-time").addEventListener("click", () => {
+  runCopy(loadTimeEnvLines, "Copied TIME_COOKIE and TIME_CSRF lines.");
+});
+
+document.getElementById("copy-ktalk").addEventListener("click", () => {
+  runCopy(loadKTalkAuth, "Copied KTalk auth token for ktalk_auth.txt.");
+});