diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6770bcebfb6..b7331b9f668 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -32,6 +32,7 @@ Docs: https://docs.openclaw.ai
 ### Fixes
 
 - Models/openai-completions streaming compatibility: force `compat.supportsUsageInStreaming=false` for non-native OpenAI-compatible endpoints during model normalization, preventing usage-only stream chunks from triggering `choices[0]` parser crashes in provider streams. (#8714) Thanks @nonanon1.
+- Tools/xAI native web-search collision guard: drop OpenClaw `web_search` from tool registration when routing to xAI/Grok model providers (including OpenRouter `x-ai/*`) to avoid duplicate tool-name request failures against provider-native `web_search`. (#14749) Thanks @realsamrat.
 - TUI/token copy-safety rendering: treat long credential-like mixed alphanumeric tokens (including quoted forms) as copy-sensitive in render sanitization so formatter hard-wrap guards no longer inject visible spaces into auth-style values before display. (#26710) Thanks @jasonthane.
 - WhatsApp/self-chat response prefix fallback: stop forcing `"[openclaw]"` as the implicit outbound response prefix when no identity name or response prefix is configured, so blank/default prefix settings no longer inject branding text unexpectedly in self-chat flows. (#27962) Thanks @ecanmor.
 - Memory/QMD search result decoding: accept `qmd search` hits that only include `file` URIs (for example `qmd://collection/path.md`) without `docid`, resolve them through managed collection roots, and keep multi-collection results keyed by file fallback so valid QMD hits no longer collapse to empty `memory_search` output. (#28181) Thanks @0x76696265.
diff --git a/src/agents/pi-tools.model-provider-collision.test.ts b/src/agents/pi-tools.model-provider-collision.test.ts
new file mode 100644
index 00000000000..7cbceac712e
--- /dev/null
+++ b/src/agents/pi-tools.model-provider-collision.test.ts
@@ -0,0 +1,42 @@
+import { describe, expect, it } from "vitest";
+import { __testing } from "./pi-tools.js";
+import type { AnyAgentTool } from "./pi-tools.types.js";
+
+const baseTools = [
+  { name: "read" },
+  { name: "web_search" },
+  { name: "exec" },
+] as unknown as AnyAgentTool[];
+
+function toolNames(tools: AnyAgentTool[]): string[] {
+  return tools.map((tool) => tool.name);
+}
+
+describe("applyModelProviderToolPolicy", () => {
+  it("keeps web_search for non-xAI models", () => {
+    const filtered = __testing.applyModelProviderToolPolicy(baseTools, {
+      modelProvider: "openai",
+      modelId: "gpt-4o-mini",
+    });
+
+    expect(toolNames(filtered)).toEqual(["read", "web_search", "exec"]);
+  });
+
+  it("removes web_search for OpenRouter xAI model ids", () => {
+    const filtered = __testing.applyModelProviderToolPolicy(baseTools, {
+      modelProvider: "openrouter",
+      modelId: "x-ai/grok-4.1-fast",
+    });
+
+    expect(toolNames(filtered)).toEqual(["read", "exec"]);
+  });
+
+  it("removes web_search for direct xAI providers", () => {
+    const filtered = __testing.applyModelProviderToolPolicy(baseTools, {
+      modelProvider: "x-ai",
+      modelId: "grok-4.1",
+    });
+
+    expect(toolNames(filtered)).toEqual(["read", "exec"]);
+  });
+});
diff --git a/src/agents/pi-tools.ts b/src/agents/pi-tools.ts
index 7d6fdf1c140..543a163ab0c 100644
--- a/src/agents/pi-tools.ts
+++ b/src/agents/pi-tools.ts
@@ -43,6 +43,7 @@ import {
 import { cleanToolSchemaForGemini, normalizeToolParameters } from "./pi-tools.schema.js";
 import type { AnyAgentTool } from "./pi-tools.types.js";
 import type { SandboxContext } from "./sandbox.js";
+import { isXaiProvider } from "./schema/clean-for-xai.js";
 import { getSubagentDepthFromSessionStore } from "./subagent-depth.js";
 import { createToolFsPolicy, resolveToolFsConfig } from "./tool-fs-policy.js";
 import {
@@ -65,6 +66,7 @@ function isOpenAIProvider(provider?: string) {
 const TOOL_DENY_BY_MESSAGE_PROVIDER: Readonly<Record<string, readonly string[]>> = {
   voice: ["tts"],
 };
+const TOOL_DENY_FOR_XAI_PROVIDERS = new Set(["web_search"]);
 
 function normalizeMessageProvider(messageProvider?: string): string | undefined {
   const normalized = messageProvider?.trim().toLowerCase();
@@ -87,6 +89,18 @@ function applyMessageProviderToolPolicy(
   return tools.filter((tool) => !deniedSet.has(tool.name));
 }
 
+function applyModelProviderToolPolicy(
+  tools: AnyAgentTool[],
+  params?: { modelProvider?: string; modelId?: string },
+): AnyAgentTool[] {
+  if (!isXaiProvider(params?.modelProvider, params?.modelId)) {
+    return tools;
+  }
+  // xAI/Grok providers expose a native web_search tool; sending OpenClaw's
+  // web_search alongside it causes duplicate-name request failures.
+  return tools.filter((tool) => !TOOL_DENY_FOR_XAI_PROVIDERS.has(tool.name));
+}
+
 function isApplyPatchAllowedForModel(params: {
   modelProvider?: string;
   modelId?: string;
@@ -177,6 +191,7 @@ export const __testing = {
   patchToolSchemaForClaudeCompatibility,
   wrapToolParamNormalization,
   assertRequiredParams,
+  applyModelProviderToolPolicy,
 } as const;
 
 export function createOpenClawCodingTools(options?: {
@@ -501,9 +516,13 @@ export function createOpenClawCodingTools(options?: {
     }),
   ];
   const toolsForMessageProvider = applyMessageProviderToolPolicy(tools, options?.messageProvider);
+  const toolsForModelProvider = applyModelProviderToolPolicy(toolsForMessageProvider, {
+    modelProvider: options?.modelProvider,
+    modelId: options?.modelId,
+  });
   // Security: treat unknown/undefined as unauthorized (opt-in, not opt-out)
   const senderIsOwner = options?.senderIsOwner === true;
-  const toolsByAuthorization = applyOwnerOnlyToolPolicy(toolsForMessageProvider, senderIsOwner);
+  const toolsByAuthorization = applyOwnerOnlyToolPolicy(toolsForModelProvider, senderIsOwner);
   const subagentFiltered = applyToolPolicyPipeline({
     tools: toolsByAuthorization,
     toolMeta: (tool) => getPluginToolMeta(tool),