Add Anthropic web_search settings and wire into BYOK provider

package.json

@@ -3230,6 +3230,67 @@
 							"onExp"
 						]
 					},
+					"github.copilot.chat.anthropic.tools.websearch.maxUses": {
+						"type": "number",
+						"default": 5,
+						"markdownDescription": "%github.copilot.config.anthropic.tools.websearch.maxUses%",
+						"minimum": 1,
+						"maximum": 20,
+						"tags": [
+							"experimental"
+						]
+					},
+					"github.copilot.chat.anthropic.tools.websearch.allowedDomains": {
+						"type": "array",
+						"default": [],
+						"markdownDescription": "%github.copilot.config.anthropic.tools.websearch.allowedDomains%",
+						"items": {
+							"type": "string"
+						},
+						"tags": [
+							"experimental"
+						]
+					},
+					"github.copilot.chat.anthropic.tools.websearch.blockedDomains": {
+						"type": "array",
+						"default": [],
+						"markdownDescription": "%github.copilot.config.anthropic.tools.websearch.blockedDomains%",
+						"items": {
+							"type": "string"
+						},
+						"tags": [
+							"experimental"
+						]
+					},
+					"github.copilot.chat.anthropic.tools.websearch.userLocation": {
+						"type": [
+							"object",
+							"null"
+						],
+						"default": null,
+						"markdownDescription": "%github.copilot.config.anthropic.tools.websearch.userLocation%",
+						"properties": {
+							"city": {
+								"type": "string",
+								"description": "City name (e.g., 'San Francisco')"
+							},
+							"region": {
+								"type": "string",
+								"description": "State or region (e.g., 'California')"
+							},
+							"country": {
+								"type": "string",
+								"description": "ISO country code (e.g., 'US')"
+							},
+							"timezone": {
+								"type": "string",
+								"description": "IANA timezone identifier (e.g., 'America/Los_Angeles')"
+							}
+						},
+						"tags": [
+							"experimental"
+						]
+					},
 					"github.copilot.chat.tools.memory.enabled": {
 						"type": "boolean",
 						"default": false,

package.nls.json

@@ -347,6 +347,10 @@
 	"github.copilot.config.anthropic.thinking.enabled": "Enable extended thinking for Anthropic models that support it. \n\n **Note**: This is an experimental feature only supported in BYOK Anthropic models.",
 	"github.copilot.config.anthropic.thinking.maxTokens": "Maximum number of tokens to allocate for extended thinking in Anthropic models. Valid range is 1,024 to 32,000 tokens. Always capped at (max output tokens - 1).\n\n**Note**: This is an experimental feature only supported in BYOK Anthropic models.",
 	"github.copilot.config.anthropic.tools.websearch.enabled": "Enable Anthropic's native web search tool for BYOK Claude models. When enabled, allows Claude to search the web for current information. \n\n**Note**: This is an experimental feature only available for BYOK Anthropic Claude models.",
+	"github.copilot.config.anthropic.tools.websearch.maxUses": "Maximum number of web searches allowed per request. Valid range is 1 to 20. Prevents excessive API calls within a single interaction. If Claude exceeds this limit, the response returns an error.",
+	"github.copilot.config.anthropic.tools.websearch.allowedDomains": "List of domains to restrict web search results to (e.g., `[\"example.com\", \"docs.example.com\"]`). Domains should not include the HTTP/HTTPS scheme. Subdomains are automatically included. Cannot be used together with blocked domains.",
+	"github.copilot.config.anthropic.tools.websearch.blockedDomains": "List of domains to exclude from web search results (e.g., `[\"untrustedsource.com\"]`). Domains should not include the HTTP/HTTPS scheme. Subdomains are automatically excluded. Cannot be used together with allowed domains.",
+	"github.copilot.config.anthropic.tools.websearch.userLocation": "User location for personalizing web search results based on geographic context. All fields (city, region, country, timezone) are optional. Example: `{\"city\": \"San Francisco\", \"region\": \"California\", \"country\": \"US\", \"timezone\": \"America/Los_Angeles\"}`",
 	"github.copilot.config.tools.memory.enabled": "Enable memory tool to allow models to store and retrieve information across conversations. \n\n**Note**: This is an experimental feature.",
 	"github.copilot.config.completionsFetcher": "Sets the fetcher used for the inline completions.",
 	"github.copilot.config.nesFetcher": "Sets the fetcher used for the next edit suggestions.",

src/extension/byok/vscode-node/anthropicProvider.ts

@@ -216,11 +216,35 @@ export class AnthropicLMProvider implements BYOKModelProvider<LanguageModelChatI
 		// We need to do this because there is no local web_search tool definition we can replace.
 		const webSearchEnabled = this._configurationService.getExperimentBasedConfig(ConfigKey.AnthropicWebSearchToolEnabled, this._experimentationService);
 		if (webSearchEnabled && !tools.some(tool => tool.name === 'web_search')) {
-			tools.push({
+			const maxUses = this._configurationService.getConfig(ConfigKey.AnthropicWebSearchMaxUses);
+			const allowedDomains = this._configurationService.getConfig(ConfigKey.AnthropicWebSearchAllowedDomains);
+			const blockedDomains = this._configurationService.getConfig(ConfigKey.AnthropicWebSearchBlockedDomains);
+			const userLocation = this._configurationService.getConfig(ConfigKey.AnthropicWebSearchUserLocation);
+
+			const webSearchTool: Anthropic.Beta.BetaWebSearchTool20250305 = {
 				name: 'web_search',
 				type: 'web_search_20250305',
-				max_uses: 5
-			});
+				max_uses: maxUses
+			};
+
+			// Add domain filtering if configured
+			// Cannot use both allowed and blocked domains simultaneously
+			if (allowedDomains && allowedDomains.length > 0) {
+				webSearchTool.allowed_domains = allowedDomains;
+			} else if (blockedDomains && blockedDomains.length > 0) {
+				webSearchTool.blocked_domains = blockedDomains;
+			}
+
+			// Add user location if configured
+			// Note: All fields are optional according to Anthropic docs
+			if (userLocation && (userLocation.city || userLocation.region || userLocation.country || userLocation.timezone)) {
+				webSearchTool.user_location = {
+					type: 'approximate',
+					...userLocation
+				};
+			}
+
+			tools.push(webSearchTool);
 		}
 
 		const thinkingEnabled = this._enableThinking(model.id);

src/platform/configuration/common/configurationService.ts

@@ -764,6 +764,19 @@ export namespace ConfigKey {
 	export const MaxAnthropicThinkingTokens = defineSetting<number | null>('chat.anthropic.thinking.maxTokens', null);
 	/** Enable Anthropic web search tool for BYOK Claude models */
 	export const AnthropicWebSearchToolEnabled = defineExpSetting<boolean>('chat.anthropic.tools.websearch.enabled', false);
+	/** Maximum number of web searches allowed per request */
+	export const AnthropicWebSearchMaxUses = defineSetting<number>('chat.anthropic.tools.websearch.maxUses', 5);
+	/** List of domains to restrict web search results to */
+	export const AnthropicWebSearchAllowedDomains = defineSetting<string[]>('chat.anthropic.tools.websearch.allowedDomains', []);
+	/** List of domains to exclude from web search results */
+	export const AnthropicWebSearchBlockedDomains = defineSetting<string[]>('chat.anthropic.tools.websearch.blockedDomains', []);
+	/** User location for personalizing web search results */
+	export const AnthropicWebSearchUserLocation = defineSetting<{
+		city?: string;
+		region?: string;
+		country?: string;
+		timezone?: string;
+	} | null>('chat.anthropic.tools.websearch.userLocation', null);
 	/** Enable memory tool */
 	export const MemoryToolEnabled = defineExpSetting<boolean>('chat.tools.memory.enabled', false);