diff --git a/src/vs/workbench/api/browser/mainThreadLanguageModelTools.ts b/src/vs/workbench/api/browser/mainThreadLanguageModelTools.ts
index 4e238f18fc0..d203c83c7e9 100644
--- a/src/vs/workbench/api/browser/mainThreadLanguageModelTools.ts
+++ b/src/vs/workbench/api/browser/mainThreadLanguageModelTools.ts
@@ -101,4 +101,8 @@ export class MainThreadLanguageModelTools extends Disposable implements MainThre
 	$unregisterTool(name: string): void {
 		this._tools.deleteAndDispose(name);
 	}
+
+	$supportsModel(toolId: string, modelId: string, token: CancellationToken): Promise<boolean | undefined> {
+		return this._languageModelToolsService.supportsModel(toolId, modelId, token);
+	}
 }
diff --git a/src/vs/workbench/api/common/extHost.api.impl.ts b/src/vs/workbench/api/common/extHost.api.impl.ts
index a976c20189f..fe44360a8c2 100644
--- a/src/vs/workbench/api/common/extHost.api.impl.ts
+++ b/src/vs/workbench/api/common/extHost.api.impl.ts
@@ -1594,8 +1594,11 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 			registerTool<T>(name: string, tool: vscode.LanguageModelTool<T>) {
 				return extHostLanguageModelTools.registerTool(extension, name, tool);
 			},
-			invokeTool<T>(name: string, parameters: vscode.LanguageModelToolInvocationOptions<T>, token?: vscode.CancellationToken) {
-				return extHostLanguageModelTools.invokeTool(extension, name, parameters, token);
+			invokeTool<T>(nameOrInfo: string | vscode.LanguageModelToolInformation, parameters: vscode.LanguageModelToolInvocationOptions<T>, token?: vscode.CancellationToken) {
+				if (typeof nameOrInfo !== 'string') {
+					checkProposedApiEnabled(extension, 'chatParticipantAdditions');
+				}
+				return extHostLanguageModelTools.invokeTool(extension, nameOrInfo, parameters, token);
 			},
 			get tools() {
 				return extHostLanguageModelTools.getTools(extension);
diff --git a/src/vs/workbench/api/common/extHost.protocol.ts b/src/vs/workbench/api/common/extHost.protocol.ts
index 7b4bf5c106d..41b78407b65 100644
--- a/src/vs/workbench/api/common/extHost.protocol.ts
+++ b/src/vs/workbench/api/common/extHost.protocol.ts
@@ -1463,6 +1463,7 @@ export interface MainThreadLanguageModelToolsShape extends IDisposable {
 	$countTokensForInvocation(callId: string, input: string, token: CancellationToken): Promise<number>;
 	$registerTool(id: string): void;
 	$unregisterTool(name: string): void;
+	$supportsModel(toolId: string, modelId: string, token: CancellationToken): Promise<boolean | undefined>;
 }
 
 export type IChatRequestVariableValueDto = Dto<IChatRequestVariableValue>;
diff --git a/src/vs/workbench/api/common/extHostLanguageModelTools.ts b/src/vs/workbench/api/common/extHostLanguageModelTools.ts
index 6faed42eb75..561ae1e9e6f 100644
--- a/src/vs/workbench/api/common/extHostLanguageModelTools.ts
+++ b/src/vs/workbench/api/common/extHostLanguageModelTools.ts
@@ -101,7 +101,8 @@ export class ExtHostLanguageModelTools implements ExtHostLanguageModelToolsShape
 		return await fn(input, token);
 	}
 
-	async invokeTool(extension: IExtensionDescription, toolId: string, options: vscode.LanguageModelToolInvocationOptions<any>, token?: CancellationToken): Promise<vscode.LanguageModelToolResult> {
+	async invokeTool(extension: IExtensionDescription, toolIdOrInfo: string | vscode.LanguageModelToolInformation, options: vscode.LanguageModelToolInvocationOptions<any>, token?: CancellationToken): Promise<vscode.LanguageModelToolResult> {
+		const toolId = typeof toolIdOrInfo === 'string' ? toolIdOrInfo : toolIdOrInfo.name;
 		const callId = generateUuid();
 		if (options.tokenizationOptions) {
 			this._tokenCountFuncs.set(callId, options.tokenizationOptions.countTokens);
@@ -176,21 +177,7 @@ export class ExtHostLanguageModelTools implements ExtHostLanguageModelToolsShape
 	 * @returns `true` if supported, `false` if not, `undefined` if no supportsModel implementation (treat as supported)
 	 */
 	async supportsModel(toolId: string, modelId: string, token: CancellationToken): Promise<boolean | undefined> {
-		const item = this._registeredTools.get(toolId);
-		if (!item) {
-			// Tool is not registered in this extension host, assume it supports all models
-			return undefined;
-		}
-
-		// supportsModel is a proposed API
-		const supportsModelFn = item.tool.supportsModel;
-		if (supportsModelFn) {
-			const result = await supportsModelFn(modelId);
-			return result ?? undefined;
-		}
-
-		// No supportsModel method means tool supports all models
-		return undefined;
+		return this._proxy.$supportsModel(toolId, modelId, token);
 	}
 
 	async $invokeTool(dto: Dto<IToolInvocation>, token: CancellationToken): Promise<Dto<IToolResult> | SerializableObjectWithBuffers<Dto<IToolResult>>> {
@@ -309,8 +296,7 @@ export class ExtHostLanguageModelTools implements ExtHostLanguageModelToolsShape
 		// supportsModel is a proposed API
 		const supportsModelFn = item.tool.supportsModel;
 		if (supportsModelFn) {
-			const result = await supportsModelFn(modelId);
-			return result ?? undefined;
+			return supportsModelFn(modelId);
 		}
 
 		return undefined;
diff --git a/src/vscode-dts/vscode.proposed.chatParticipantAdditions.d.ts b/src/vscode-dts/vscode.proposed.chatParticipantAdditions.d.ts
index fb9bc8a83c5..038c60655e8 100644
--- a/src/vscode-dts/vscode.proposed.chatParticipantAdditions.d.ts
+++ b/src/vscode-dts/vscode.proposed.chatParticipantAdditions.d.ts
@@ -410,6 +410,18 @@ declare module 'vscode' {
 		 * Fired when the set of tools on a chat request changes.
 		 */
 		export const onDidChangeChatRequestTools: Event<ChatRequest>;
+
+		/**
+		 * Invoke a tool by its full information object rather than just name.
+		 * This allows disambiguation when multiple tools have the same name
+		 * (e.g., from different MCP servers or model-specific implementations).
+		 *
+		 * @param tool The tool information object, typically obtained from {@link lm.tools}.
+		 * @param options The options to use when invoking the tool.
+		 * @param token A cancellation token.
+		 * @returns The result of the tool invocation.
+		 */
+		export function invokeTool(tool: LanguageModelToolInformation, options: LanguageModelToolInvocationOptions<object>, token?: CancellationToken): Thenable<LanguageModelToolResult>;
 	}
 
 	export class LanguageModelToolExtensionSource {