feat: add routed online search providers

extensions/tool-routing.ts

@@ -11,6 +11,10 @@ function hasTool(selectedTools: SelectedTools, name: string): boolean {
 	return selectedTools === undefined || selectedTools.includes(name);
 }
 
+function hasAnyTool(selectedTools: SelectedTools, names: string[]): boolean {
+	return names.some((name) => hasTool(selectedTools, name));
+}
+
 export function buildToolRoutingSection(selectedTools: SelectedTools): string {
 	const rules: string[] = [];
 
@@ -40,6 +44,30 @@ export function buildToolRoutingSection(selectedTools: SelectedTools): string {
 		);
 	}
 
+	const tavilyTools = ["tavily_web_search", "tavily_web_fetch"];
+	const exaTools = ["exa_web_search", "exa_web_fetch", "exa_web_search_advanced"];
+	const keenableTools = ["keenable_search", "keenable_fetch"];
+	if (hasAnyTool(selectedTools, [...tavilyTools, ...exaTools, ...keenableTools])) {
+		rules.push(
+			"- Choose one online search provider based on the task instead of querying Tavily, Exa, and Keenable by default; cross-check with another provider only when source quality or uncertainty warrants it.",
+		);
+	}
+	if (hasAnyTool(selectedTools, tavilyTools)) {
+		rules.push(
+			"- Use Tavily tools for broad discovery when keywords are uncertain, for news/recent/trending topics, or when many candidate sources are useful. Tavily results can mix official pages, blogs, forums, and secondary sources, so keep max_results modest, avoid raw content unless needed, and fetch only selected pages when depth matters.",
+		);
+	}
+	if (hasAnyTool(selectedTools, exaTools)) {
+		rules.push(
+			"- Use Exa tools when source precision matters: official or API documentation, release/version information, academic papers, research material, and high-quality fact confirmation. Use exa_web_fetch to continue reading selected pages; for exa_web_search_advanced, explicitly bound the result count and returned text length to prevent oversized responses.",
+		);
+	}
+	if (hasAnyTool(selectedTools, keenableTools)) {
+		rules.push(
+			"- Use Keenable tools for Chinese-language pages, policies and government notices, site-restricted search, and publication-date filtering. Prefer its compact search results and fetch only selected pages to keep returned content controlled; KEENABLE_API_KEY is optional but raises rate limits.",
+		);
+	}
+
 	if (hasTool(selectedTools, "ctx_execute") || hasTool(selectedTools, "ctx_execute_file")) {
 		rules.push(
 			"- Use Context Mode for logs, test/build output, generated data, large-file exploration/analysis/summarization, and any command whose output may be large or unpredictable. Prefer ctx_execute_file over read when deriving an answer from a large file inside the workspace, and print only the derived answer needed for the task.",