fix(browser): limit ai snapshot size

test(browser): cover ai snapshot limit

src/agents/tools/browser-tool.test.ts

@@ -0,0 +1,92 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+const browserClientMocks = vi.hoisted(() => ({
+  browserCloseTab: vi.fn(async () => ({})),
+  browserFocusTab: vi.fn(async () => ({})),
+  browserOpenTab: vi.fn(async () => ({})),
+  browserSnapshot: vi.fn(async () => ({
+    ok: true,
+    format: "ai",
+    targetId: "t1",
+    url: "https://example.com",
+    snapshot: "ok",
+  })),
+  browserStart: vi.fn(async () => ({})),
+  browserStatus: vi.fn(async () => ({
+    ok: true,
+    running: true,
+    pid: 1,
+    cdpPort: 18792,
+    cdpUrl: "http://127.0.0.1:18792",
+  })),
+  browserStop: vi.fn(async () => ({})),
+  browserTabs: vi.fn(async () => []),
+}));
+vi.mock("../../browser/client.js", () => browserClientMocks);
+
+const browserConfigMocks = vi.hoisted(() => ({
+  resolveBrowserConfig: vi.fn(() => ({
+    enabled: true,
+    controlUrl: "http://127.0.0.1:18791",
+    controlHost: "127.0.0.1",
+    controlPort: 18791,
+    cdpProtocol: "http",
+    cdpHost: "127.0.0.1",
+    cdpIsLoopback: true,
+    color: "#FF0000",
+    headless: true,
+    noSandbox: false,
+    attachOnly: false,
+    defaultProfile: "clawd",
+    profiles: {
+      clawd: {
+        cdpPort: 18792,
+        color: "#FF0000",
+      },
+    },
+  })),
+}));
+vi.mock("../../browser/config.js", () => browserConfigMocks);
+
+vi.mock("../../config/config.js", () => ({
+  loadConfig: vi.fn(() => ({ browser: {} })),
+}));
+
+import { DEFAULT_AI_SNAPSHOT_MAX_CHARS } from "../../browser/constants.js";
+import { createBrowserTool } from "./browser-tool.js";
+
+describe("browser tool snapshot maxChars", () => {
+  afterEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("applies the default ai snapshot limit", async () => {
+    const tool = createBrowserTool();
+    await tool.execute?.(null, { action: "snapshot", format: "ai" });
+
+    expect(browserClientMocks.browserSnapshot).toHaveBeenCalledWith(
+      "http://127.0.0.1:18791",
+      expect.objectContaining({
+        format: "ai",
+        maxChars: DEFAULT_AI_SNAPSHOT_MAX_CHARS,
+      }),
+    );
+  });
+
+  it("respects an explicit maxChars override", async () => {
+    const tool = createBrowserTool();
+    const override = 2_000;
+    await tool.execute?.(null, {
+      action: "snapshot",
+      format: "ai",
+      maxChars: override,
+    });
+
+    expect(browserClientMocks.browserSnapshot).toHaveBeenCalledWith(
+      "http://127.0.0.1:18791",
+      expect.objectContaining({
+        maxChars: override,
+      }),
+    );
+  });
+});