feat: mcp router skeleton (#2606)

crates/goose/src/agents/router_tool_selector.rs

@@ -0,0 +1,36 @@
+use mcp_core::{Content, ToolError};
+
+use async_trait::async_trait;
+use serde_json::Value;
+
+pub enum RouterToolSelectionStrategy {
+    Vector,
+}
+
+#[async_trait]
+pub trait RouterToolSelector: Send + Sync {
+    async fn select_tools(&self, params: Value) -> Result<Vec<Content>, ToolError>;
+}
+
+pub struct VectorToolSelector;
+
+#[async_trait]
+impl RouterToolSelector for VectorToolSelector {
+    async fn select_tools(&self, params: Value) -> Result<Vec<Content>, ToolError> {
+        let query = params.get("query").and_then(|v| v.as_str());
+        println!("query: {:?}", query);
+        let selected_tools = Vec::new();
+        // TODO: placeholder for vector tool selection
+        Ok(selected_tools)
+    }
+}
+
+// Helper function to create a boxed tool selector
+pub fn create_tool_selector(
+    strategy: Option<RouterToolSelectionStrategy>,
+) -> Box<dyn RouterToolSelector> {
+    match strategy {
+        Some(RouterToolSelectionStrategy::Vector) => Box::new(VectorToolSelector),
+        _ => Box::new(VectorToolSelector), // Default to VectorToolSelector
+    }
+}