diff --git a/extensions/browser/src/browser/routes/agent.act.ts b/extensions/browser/src/browser/routes/agent.act.ts
index b70f3eb585db..91ce8c901f3a 100644
--- a/extensions/browser/src/browser/routes/agent.act.ts
+++ b/extensions/browser/src/browser/routes/agent.act.ts
@@ -1,3 +1,9 @@
+/**
+ * Browser agent action route registration and existing-session execution.
+ *
+ * Dispatches normalized actions to either Playwright-backed OpenClaw browser
+ * control or Chrome MCP existing-session operations with navigation guards.
+ */
 import { formatErrorMessage } from "../../infra/errors.js";
 import {
   clickChromeMcpElement,
@@ -350,6 +356,7 @@ function getExistingSessionUnsupportedMessage(action: BrowserActRequest): string
   throw new Error("Unsupported browser act kind");
 }
 
+/** Register browser action endpoints, including hook and download subroutes. */
 export function registerBrowserAgentActRoutes(
   app: BrowserRouteRegistrar,
   ctx: BrowserRouteContext,
diff --git a/extensions/browser/src/browser/routes/agent.debug.ts b/extensions/browser/src/browser/routes/agent.debug.ts
index ef232395155a..9305fe26bf5b 100644
--- a/extensions/browser/src/browser/routes/agent.debug.ts
+++ b/extensions/browser/src/browser/routes/agent.debug.ts
@@ -1,3 +1,9 @@
+/**
+ * Browser debug and trace routes.
+ *
+ * Exposes console messages, page errors, network requests, dialog state, and
+ * Playwright tracing scoped to the selected browser tab.
+ */
 import crypto from "node:crypto";
 import path from "node:path";
 import { normalizeOptionalString } from "openclaw/plugin-sdk/string-coerce-runtime";
@@ -44,6 +50,7 @@ async function sendPlaywrightDebugCollection(params: {
   });
 }
 
+/** Register browser debug endpoints on the control server. */
 export function registerBrowserAgentDebugRoutes(
   app: BrowserRouteRegistrar,
   ctx: BrowserRouteContext,
diff --git a/extensions/browser/src/browser/routes/agent.shared.ts b/extensions/browser/src/browser/routes/agent.shared.ts
index 89795bde093e..56ae17826cfc 100644
--- a/extensions/browser/src/browser/routes/agent.shared.ts
+++ b/extensions/browser/src/browser/routes/agent.shared.ts
@@ -1,3 +1,9 @@
+/**
+ * Shared browser route helpers.
+ *
+ * Centralizes body/query parsing, profile resolution, error mapping, Playwright
+ * availability checks, and tab-context guards for route modules.
+ */
 import { normalizeOptionalString } from "openclaw/plugin-sdk/string-coerce-runtime";
 import { resolveBrowserNavigationProxyMode } from "../browser-proxy-mode.js";
 import { toBrowserErrorResponse } from "../errors.js";
@@ -21,6 +27,7 @@ export const SELECTOR_UNSUPPORTED_MESSAGE = [
   "This is more reliable for modern SPAs.",
 ].join("\n");
 
+/** Return a safe object body for routes that accept JSON payloads. */
 export function readBody(req: BrowserRequest): Record<string, unknown> {
   const body = req.body as Record<string, unknown> | undefined;
   if (!body || typeof body !== "object" || Array.isArray(body)) {
@@ -29,16 +36,19 @@ export function readBody(req: BrowserRequest): Record<string, unknown> {
   return body;
 }
 
+/** Read an optional targetId from a request body. */
 export function resolveTargetIdFromBody(body: Record<string, unknown>): string | undefined {
   const targetId = normalizeOptionalString(body.targetId) ?? "";
   return targetId || undefined;
 }
 
+/** Read an optional targetId from a query object. */
 export function resolveTargetIdFromQuery(query: Record<string, unknown>): string | undefined {
   const targetId = normalizeOptionalString(query.targetId) ?? "";
   return targetId || undefined;
 }
 
+/** Map route-level browser errors to HTTP JSON responses. */
 export function handleRouteError(ctx: BrowserRouteContext, res: BrowserResponse, err: unknown) {
   const mapped = ctx.mapTabError(err);
   if (mapped) {
@@ -51,6 +61,7 @@ export function handleRouteError(ctx: BrowserRouteContext, res: BrowserResponse,
   jsonError(res, 500, String(err));
 }
 
+/** Resolve the requested browser profile and respond with JSON on failure. */
 export function resolveProfileContext(
   req: BrowserRequest,
   res: BrowserResponse,
@@ -64,6 +75,7 @@ export function resolveProfileContext(
   return profileCtx;
 }
 
+/** Build navigation guard policy for a profile and current resolved config. */
 export function browserNavigationPolicyForProfile(
   ctx: BrowserRouteContext,
   profileCtx: ProfileContext,
@@ -76,10 +88,12 @@ export function browserNavigationPolicyForProfile(
   });
 }
 
+/** Load the optional Playwright bridge module in soft-fail mode. */
 export async function getPwAiModule(): Promise<PwAiModule | null> {
   return await getPwAiModuleBase({ mode: "soft" });
 }
 
+/** Require Playwright support for a route feature, returning a 501 when absent. */
 export async function requirePwAi(
   res: BrowserResponse,
   feature: string,
@@ -124,6 +138,7 @@ type RouteWithTabParams<T> = {
   run: (ctx: RouteTabContext) => Promise<T>;
 };
 
+/** Resolve profile and tab context, optionally enforcing current URL policy. */
 export async function withRouteTabContext<T>(
   params: RouteWithTabParams<T>,
 ): Promise<T | undefined> {
@@ -198,6 +213,7 @@ type RouteWithPwParams<T> = {
   run: (ctx: RouteTabPwContext) => Promise<T>;
 };
 
+/** Resolve profile, tab, and Playwright context for Playwright-only routes. */
 export async function withPlaywrightRouteContext<T>(
   params: RouteWithPwParams<T>,
 ): Promise<T | undefined> {
diff --git a/extensions/browser/src/browser/routes/agent.snapshot.plan.ts b/extensions/browser/src/browser/routes/agent.snapshot.plan.ts
index 333e16bca695..c27744dd200d 100644
--- a/extensions/browser/src/browser/routes/agent.snapshot.plan.ts
+++ b/extensions/browser/src/browser/routes/agent.snapshot.plan.ts
@@ -1,3 +1,9 @@
+/**
+ * Snapshot planning for browser route handlers.
+ *
+ * Resolves requested snapshot mode, format, limits, refs, labels, and driver
+ * choice before the route talks to Playwright or Chrome MCP.
+ */
 import {
   parseStrictNonNegativeInteger,
   parseStrictPositiveInteger,
@@ -34,6 +40,7 @@ type BrowserSnapshotPlan = {
   wantsRoleSnapshot: boolean;
 };
 
+/** Resolve a normalized snapshot plan from query parameters and profile caps. */
 export function resolveSnapshotPlan(params: {
   profile: ResolvedBrowserProfile;
   query: Record<string, unknown>;
diff --git a/extensions/browser/src/browser/routes/agent.snapshot.ts b/extensions/browser/src/browser/routes/agent.snapshot.ts
index a5e916b5cc26..267cd31a890c 100644
--- a/extensions/browser/src/browser/routes/agent.snapshot.ts
+++ b/extensions/browser/src/browser/routes/agent.snapshot.ts
@@ -1,3 +1,9 @@
+/**
+ * Browser snapshot, navigation, and screenshot routes.
+ *
+ * Handles profile-aware snapshot generation across Playwright and Chrome MCP,
+ * navigation policy checks, media storage, and screenshot normalization.
+ */
 import path from "node:path";
 import { ensureMediaDir, saveMediaBuffer } from "../../media/store.js";
 import { captureScreenshot, snapshotAria, snapshotRoleViaCdp } from "../cdp.js";
@@ -253,6 +259,7 @@ function browserStateResponseFields(state: unknown): { browserState?: unknown }
   return hasObservableBrowserState(state) ? { browserState: state } : {};
 }
 
+/** Register snapshot, screenshot, and navigation endpoints. */
 export function registerBrowserAgentSnapshotRoutes(
   app: BrowserRouteRegistrar,
   ctx: BrowserRouteContext,
diff --git a/extensions/browser/src/browser/routes/agent.storage.ts b/extensions/browser/src/browser/routes/agent.storage.ts
index 172420a2e389..fa4ae50200a9 100644
--- a/extensions/browser/src/browser/routes/agent.storage.ts
+++ b/extensions/browser/src/browser/routes/agent.storage.ts
@@ -1,3 +1,9 @@
+/**
+ * Browser storage and context mutation routes.
+ *
+ * Parses and applies cookies, local/session storage, geolocation, permissions,
+ * and related browser-context mutations for the selected profile/tab.
+ */
 import {
   normalizeOptionalString,
   readStringValue,
@@ -36,6 +42,7 @@ type CookieSetOptions = {
   sameSite?: "Lax" | "None" | "Strict";
 };
 
+/** Parse the supported browser storage bucket names. */
 export function parseStorageKind(raw: string): StorageKind | null {
   if (raw === "local" || raw === "session") {
     return raw;
@@ -43,6 +50,7 @@ export function parseStorageKind(raw: string): StorageKind | null {
   return null;
 }
 
+/** Parse an optional storage mutation request from a route body. */
 export function parseStorageMutationRequest(
   kindParam: unknown,
   body: Record<string, unknown>,
@@ -53,6 +61,7 @@ export function parseStorageMutationRequest(
   };
 }
 
+/** Parse a required storage mutation request and throw on invalid input. */
 export function parseRequiredStorageMutationRequest(
   kindParam: unknown,
   body: Record<string, unknown>,
@@ -104,6 +113,7 @@ function assertRange(
   return value;
 }
 
+/** Parse cookie options accepted by browser storage mutation routes. */
 export function parseCookieSetOptions(cookie: Record<string, unknown>): CookieSetOptions {
   return {
     name: toStringOrEmpty(cookie.name),
@@ -121,6 +131,7 @@ export function parseCookieSetOptions(cookie: Record<string, unknown>): CookieSe
   };
 }
 
+/** Parse geolocation override options accepted by context mutation routes. */
 export function parseGeolocationOptions(body: Record<string, unknown>): GeolocationOptions {
   const clear = toBoolean(body.clear) ?? false;
   const origin = toStringOrEmpty(body.origin) || undefined;
@@ -149,6 +160,7 @@ export function parseGeolocationOptions(body: Record<string, unknown>): Geolocat
   return { clear, latitude, longitude, accuracy, origin };
 }
 
+/** Register storage and browser-context mutation endpoints. */
 export function registerBrowserAgentStorageRoutes(
   app: BrowserRouteRegistrar,
   ctx: BrowserRouteContext,