fix(browser): limit ai snapshot size

test(browser): cover ai snapshot limit

src/browser/constants.ts

@@ -2,3 +2,4 @@ export const DEFAULT_CLAWD_BROWSER_ENABLED = true;
 export const DEFAULT_CLAWD_BROWSER_CONTROL_URL = "http://127.0.0.1:18791";
 export const DEFAULT_CLAWD_BROWSER_COLOR = "#FF4500";
 export const DEFAULT_CLAWD_BROWSER_PROFILE_NAME = "clawd";
+export const DEFAULT_AI_SNAPSHOT_MAX_CHARS = 80_000;

src/browser/routes/agent.ts

@@ -7,6 +7,7 @@ import type express from "express";
 import { ensureMediaDir, saveMediaBuffer } from "../../media/store.js";
 import { captureScreenshot, snapshotAria } from "../cdp.js";
 import type { BrowserFormField } from "../client-actions-core.js";
+import { DEFAULT_AI_SNAPSHOT_MAX_CHARS } from "../constants.js";
 import {
   DEFAULT_BROWSER_SCREENSHOT_MAX_BYTES,
   DEFAULT_BROWSER_SCREENSHOT_MAX_SIDE,
@@ -1205,6 +1206,8 @@ export function registerBrowserAgentRoutes(
       maxCharsRaw > 0
         ? Math.floor(maxCharsRaw)
         : undefined;
+    const resolvedMaxChars =
+      format === "ai" ? (maxChars ?? DEFAULT_AI_SNAPSHOT_MAX_CHARS) : undefined;
     const interactive = toBoolean(req.query.interactive);
     const compact = toBoolean(req.query.compact);
     const depth = toNumber(req.query.depth);
@@ -1239,7 +1242,9 @@ export function registerBrowserAgentRoutes(
               .snapshotAiViaPlaywright({
                 cdpUrl: profileCtx.profile.cdpUrl,
                 targetId: tab.targetId,
-                ...(maxChars ? { maxChars } : {}),
+                ...(typeof resolvedMaxChars === "number"
+                  ? { maxChars: resolvedMaxChars }
+                  : {}),
               })
               .catch(async (err) => {
                 // Public-API fallback when Playwright's private _snapshotForAI is missing.

src/browser/server.test.ts

@@ -2,6 +2,7 @@ import { type AddressInfo, createServer } from "node:net";
 import { fetch as realFetch } from "undici";
 
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { DEFAULT_AI_SNAPSHOT_MAX_CHARS } from "./constants.js";
 
 let testPort = 0;
 let cdpBaseUrl = "";
@@ -329,6 +330,7 @@ describe("browser control server", () => {
     expect(pwMocks.snapshotAiViaPlaywright).toHaveBeenCalledWith({
       cdpUrl: cdpBaseUrl,
       targetId: "abcd1234",
+      maxChars: DEFAULT_AI_SNAPSHOT_MAX_CHARS,
     });
 
     const nav = (await realFetch(`${base}/navigate`, {