docs: Add comprehensive documentation for modes, services, and plugins

Co-authored-by: aider (openai/andrew/openrouter/sonoma-sky-alpha) <aider@aider.chat>

src/modes/server/mcp/server.rs

@@ -5,15 +5,43 @@ use crate::modes::server::common::AppState;
 use super::tools::{KeepTools, ToolError};
 
 #[derive(Clone)]
+/// Server handler for MCP (Model Context Protocol) requests.
+///
+/// Routes requests to appropriate tools and handles responses.
 pub struct KeepMcpServer {
     state: AppState,
 }
 
 impl KeepMcpServer {
+    /// Creates a new `KeepMcpServer` instance.
+    ///
+    /// # Arguments
+    ///
+    /// * `state` - The application state containing DB and config.
+    ///
+    /// # Returns
+    ///
+    /// A new `KeepMcpServer`.
     pub fn new(state: AppState) -> Self {
         Self { state }
     }
 
+    /// Handles an MCP request by routing to the appropriate tool.
+    ///
+    /// Supports methods like save_item, get_item, etc.
+    ///
+    /// # Arguments
+    ///
+    /// * `method` - The MCP method name.
+    /// * `params` - Optional JSON parameters.
+    ///
+    /// # Returns
+    ///
+    /// JSON string response on success, or ToolError.
+    ///
+    /// # Errors
+    ///
+    /// Returns ToolError::UnknownTool for unsupported methods.
     pub async fn handle_request(&self, method: &str, params: Option<Value>) -> Result<String, ToolError> {
         debug!("MCP: Handling request '{}' with params: {:?}", method, params);