diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8232c05c4..6b3b9f754 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -51,6 +51,7 @@ Docs: https://docs.openclaw.ai
 - Browser/Extension navigation reattach: preserve debugger re-attachment when relay is temporarily disconnected by deferring relay attach events until reconnect/re-announce, reducing post-navigation tab loss. (#28725) Thanks @stone-jin.
 - Browser/Profile defaults: prefer `openclaw` profile over `chrome` in headless/no-sandbox environments unless an explicit `defaultProfile` is configured. (#14944) Thanks @BenediktSchackenberg.
 - Browser/Remote CDP ownership checks: skip local-process ownership errors for non-loopback remote CDP profiles when HTTP is reachable but the websocket handshake fails, and surface the remote websocket attach/retry path instead. (#15582) Landed from contributor (#28780) Thanks @stubbi, @bsormagec, @unblockedgamesstudio and @vincentkoc.
+- Browser/Act request compatibility: accept legacy flattened `action="act"` params (`kind/ref/text/...`) in addition to `request={...}` so browser act calls no longer fail with `request required`. (#15120) Thanks @vincentkoc.
 - Browser/Extension relay stale tabs: evict stale cached targets from `/json/list` when extension targets are destroyed/crashed or commands fail with missing target/session errors. (#6175) Thanks @vincentkoc.
 - CLI/Browser start timeout: honor `openclaw browser --timeout <ms> start` and stop by removing the fixed 15000ms override so slower Chrome startups can use caller-provided timeouts. (#22412, #23427) Thanks @vincentkoc.
 - Browser/CDP startup diagnostics: include Chrome stderr output and a Linux no-sandbox hint in startup timeout errors so failed launches are easier to diagnose. (#29312) Thanks @veast.
diff --git a/src/agents/tools/browser-tool.schema.ts b/src/agents/tools/browser-tool.schema.ts
index bebbe5ad2..aef51f635 100644
--- a/src/agents/tools/browser-tool.schema.ts
+++ b/src/agents/tools/browser-tool.schema.ts
@@ -60,6 +60,7 @@ const BrowserActSchema = Type.Object({
   slowly: Type.Optional(Type.Boolean()),
   // press
   key: Type.Optional(Type.String()),
+  delayMs: Type.Optional(Type.Number()),
   // drag
   startRef: Type.Optional(Type.String()),
   endRef: Type.Optional(Type.String()),
@@ -72,7 +73,11 @@ const BrowserActSchema = Type.Object({
   height: Type.Optional(Type.Number()),
   // wait
   timeMs: Type.Optional(Type.Number()),
+  selector: Type.Optional(Type.String()),
+  url: Type.Optional(Type.String()),
+  loadState: Type.Optional(Type.String()),
   textGone: Type.Optional(Type.String()),
+  timeoutMs: Type.Optional(Type.Number()),
   // evaluate
   fn: Type.Optional(Type.String()),
 });
@@ -109,5 +114,25 @@ export const BrowserToolSchema = Type.Object({
   timeoutMs: Type.Optional(Type.Number()),
   accept: Type.Optional(Type.Boolean()),
   promptText: Type.Optional(Type.String()),
+  // Legacy flattened act params (preferred: request={...})
+  kind: Type.Optional(stringEnum(BROWSER_ACT_KINDS)),
+  doubleClick: Type.Optional(Type.Boolean()),
+  button: Type.Optional(Type.String()),
+  modifiers: Type.Optional(Type.Array(Type.String())),
+  text: Type.Optional(Type.String()),
+  submit: Type.Optional(Type.Boolean()),
+  slowly: Type.Optional(Type.Boolean()),
+  key: Type.Optional(Type.String()),
+  delayMs: Type.Optional(Type.Number()),
+  startRef: Type.Optional(Type.String()),
+  endRef: Type.Optional(Type.String()),
+  values: Type.Optional(Type.Array(Type.String())),
+  fields: Type.Optional(Type.Array(Type.Object({}, { additionalProperties: true }))),
+  width: Type.Optional(Type.Number()),
+  height: Type.Optional(Type.Number()),
+  timeMs: Type.Optional(Type.Number()),
+  textGone: Type.Optional(Type.String()),
+  loadState: Type.Optional(Type.String()),
+  fn: Type.Optional(Type.String()),
   request: Type.Optional(BrowserActSchema),
 });
diff --git a/src/agents/tools/browser-tool.test.ts b/src/agents/tools/browser-tool.test.ts
index f299bb552..0f9f3f5a2 100644
--- a/src/agents/tools/browser-tool.test.ts
+++ b/src/agents/tools/browser-tool.test.ts
@@ -307,6 +307,62 @@ describe("browser tool url alias support", () => {
   });
 });
 
+describe("browser tool act compatibility", () => {
+  afterEach(() => {
+    vi.clearAllMocks();
+    configMocks.loadConfig.mockReturnValue({ browser: {} });
+    nodesUtilsMocks.listNodes.mockResolvedValue([]);
+  });
+
+  it("accepts flattened act params for backward compatibility", async () => {
+    const tool = createBrowserTool();
+    await tool.execute?.("call-1", {
+      action: "act",
+      kind: "type",
+      ref: "f1e3",
+      text: "Test Title",
+      targetId: "tab-1",
+      timeoutMs: 5000,
+    });
+
+    expect(browserActionsMocks.browserAct).toHaveBeenCalledWith(
+      undefined,
+      expect.objectContaining({
+        kind: "type",
+        ref: "f1e3",
+        text: "Test Title",
+        targetId: "tab-1",
+        timeoutMs: 5000,
+      }),
+      expect.objectContaining({ profile: undefined }),
+    );
+  });
+
+  it("prefers request payload when both request and flattened fields are present", async () => {
+    const tool = createBrowserTool();
+    await tool.execute?.("call-1", {
+      action: "act",
+      kind: "click",
+      ref: "legacy-ref",
+      request: {
+        kind: "press",
+        key: "Enter",
+        targetId: "tab-2",
+      },
+    });
+
+    expect(browserActionsMocks.browserAct).toHaveBeenCalledWith(
+      undefined,
+      {
+        kind: "press",
+        key: "Enter",
+        targetId: "tab-2",
+      },
+      expect.objectContaining({ profile: undefined }),
+    );
+  });
+});
+
 describe("browser tool snapshot labels", () => {
   afterEach(() => {
     vi.clearAllMocks();
diff --git a/src/agents/tools/browser-tool.ts b/src/agents/tools/browser-tool.ts
index 2a8a9e0ce..0e7491f9b 100644
--- a/src/agents/tools/browser-tool.ts
+++ b/src/agents/tools/browser-tool.ts
@@ -91,6 +91,53 @@ function readTargetUrlParam(params: Record<string, unknown>) {
   );
 }
 
+const LEGACY_BROWSER_ACT_REQUEST_KEYS = [
+  "targetId",
+  "ref",
+  "doubleClick",
+  "button",
+  "modifiers",
+  "text",
+  "submit",
+  "slowly",
+  "key",
+  "delayMs",
+  "startRef",
+  "endRef",
+  "values",
+  "fields",
+  "width",
+  "height",
+  "timeMs",
+  "textGone",
+  "selector",
+  "url",
+  "loadState",
+  "fn",
+  "timeoutMs",
+] as const;
+
+function readActRequestParam(params: Record<string, unknown>) {
+  const requestParam = params.request;
+  if (requestParam && typeof requestParam === "object") {
+    return requestParam as Parameters<typeof browserAct>[1];
+  }
+
+  const kind = readStringParam(params, "kind");
+  if (!kind) {
+    return undefined;
+  }
+
+  const request: Record<string, unknown> = { kind };
+  for (const key of LEGACY_BROWSER_ACT_REQUEST_KEYS) {
+    if (!Object.hasOwn(params, key)) {
+      continue;
+    }
+    request[key] = params[key];
+  }
+  return request as Parameters<typeof browserAct>[1];
+}
+
 type BrowserProxyFile = {
   path: string;
   base64: string;
@@ -796,8 +843,8 @@ export function createBrowserTool(opts?: {
           );
         }
         case "act": {
-          const request = params.request as Record<string, unknown> | undefined;
-          if (!request || typeof request !== "object") {
+          const request = readActRequestParam(params);
+          if (!request) {
             throw new Error("request required");
           }
           try {
@@ -808,7 +855,7 @@ export function createBrowserTool(opts?: {
                   profile,
                   body: request,
                 })
-              : await browserAct(baseUrl, request as Parameters<typeof browserAct>[1], {
+              : await browserAct(baseUrl, request, {
                   profile,
                 });
             return jsonResult(result);