Add and improve JSDoc comments for core tool methods (#3128)

CONTRIBUTING.md

@@ -134,7 +134,7 @@ To start the Gemini CLI from the source code (after building), run the following
 npm start
 ```
 
-If you’d like to run the source build outside of the gemini-cli folder you can utilize `npm link path/to/gemini-cli/packages/cli` (see: [docs](https://docs.npmjs.com/cli/v9/commands/npm-link)) or `alias gemini="node path/to/gemini-cli/packages/cli"` to run with `gemini`
+If you'd like to run the source build outside of the gemini-cli folder you can utilize `npm link path/to/gemini-cli/packages/cli` (see: [docs](https://docs.npmjs.com/cli/v9/commands/npm-link)) or `alias gemini="node path/to/gemini-cli/packages/cli"` to run with `gemini`
 
 ### Running Tests
 

packages/cli/src/ui/hooks/useToolScheduler.test.ts

@@ -560,8 +560,8 @@ describe('useReactToolScheduler', () => {
 
     (mockToolWithLiveOutput.execute as Mock).mockImplementation(
       async (
-        _args: any,
-        _signal: any,
+        _args: Record<string, unknown>,
+        _signal: AbortSignal,
         updateFn: ((output: string) => void) | undefined,
       ) => {
         liveUpdateFn = updateFn;

packages/core/src/tools/glob.ts

@@ -122,7 +122,11 @@ export class GlobTool extends BaseTool<GlobToolParams, ToolResult> {
   }
 
   /**
-   * Checks if a path is within the root directory.
+   * Checks if a given path is within the root directory bounds.
+   * This security check prevents accessing files outside the designated root directory.
+   *
+   * @param pathToCheck The absolute path to validate
+   * @returns True if the path is within the root directory, false otherwise
    */
   private isWithinRoot(pathToCheck: string): boolean {
     const absolutePathToCheck = path.resolve(pathToCheck);

packages/core/src/tools/mcp-client.ts

@@ -162,6 +162,16 @@ export async function discoverMcpTools(
   }
 }
 
+/**
+ * Connects to an MCP server and discovers available tools, registering them with the tool registry.
+ * This function handles the complete lifecycle of connecting to a server, discovering tools,
+ * and cleaning up resources if no tools are found.
+ *
+ * @param mcpServerName The name identifier for this MCP server
+ * @param mcpServerConfig Configuration object containing connection details
+ * @param toolRegistry The registry to register discovered tools with
+ * @returns Promise that resolves when discovery is complete
+ */
 async function connectAndDiscover(
   mcpServerName: string,
   mcpServerConfig: MCPServerConfig,
@@ -375,6 +385,13 @@ async function connectAndDiscover(
   }
 }
 
+/**
+ * Sanitizes a JSON schema object to ensure compatibility with Vertex AI.
+ * This function recursively processes the schema to remove problematic properties
+ * that can cause issues with the Gemini API.
+ *
+ * @param schema The JSON schema object to sanitize (modified in-place)
+ */
 export function sanitizeParameters(schema?: Schema) {
   if (!schema) {
     return;

packages/core/src/tools/shell.ts

@@ -89,6 +89,15 @@ Process Group PGID: Process group started or \`(none)\``,
     return description;
   }
 
+  /**
+   * Extracts the root command from a given shell command string.
+   * This is used to identify the base command for permission checks.
+   *
+   * @param command The shell command string to parse
+   * @returns The root command name, or undefined if it cannot be determined
+   * @example getCommandRoot("ls -la /tmp") returns "ls"
+   * @example getCommandRoot("git status && npm test") returns "git"
+   */
   getCommandRoot(command: string): string | undefined {
     return command
       .trim() // remove leading and trailing whitespace
@@ -98,6 +107,13 @@ Process Group PGID: Process group started or \`(none)\``,
       .pop(); // take last part and return command root (or undefined if previous line was empty)
   }
 
+  /**
+   * Determines whether a given shell command is allowed to execute based on
+   * the tool's configuration including allowlists and blocklists.
+   *
+   * @param command The shell command string to validate
+   * @returns True if the command is allowed to execute, false otherwise
+   */
   isCommandAllowed(command: string): boolean {
     // 0. Disallow command substitution
     if (command.includes('$(') || command.includes('`')) {

packages/core/src/tools/web-search.ts

@@ -81,7 +81,12 @@ export class WebSearchTool extends BaseTool<
     );
   }
 
-  validateParams(params: WebSearchToolParams): string | null {
+  /**
+   * Validates the parameters for the WebSearchTool.
+   * @param params The parameters to validate
+   * @returns An error message string if validation fails, null if valid
+   */
+  validateToolParams(params: WebSearchToolParams): string | null {
     if (
       this.schema.parameters &&
       !SchemaValidator.validate(
@@ -105,7 +110,7 @@ export class WebSearchTool extends BaseTool<
     params: WebSearchToolParams,
     signal: AbortSignal,
   ): Promise<WebSearchToolResult> {
-    const validationError = this.validateParams(params);
+    const validationError = this.validateToolParams(params);
     if (validationError) {
       return {
         llmContent: `Error: Invalid parameters provided. Reason: ${validationError}`,

packages/core/src/tools/write-file.ts

@@ -96,6 +96,13 @@ export class WriteFileTool
     this.client = this.config.getGeminiClient();
   }
 
+  /**
+   * Checks if a given path is within the root directory bounds.
+   * This security check prevents writing files outside the designated root directory.
+   *
+   * @param pathToCheck The absolute path to validate
+   * @returns True if the path is within the root directory, false otherwise
+   */
   private isWithinRoot(pathToCheck: string): boolean {
     const normalizedPath = path.normalize(pathToCheck);
     const normalizedRoot = path.normalize(this.config.getTargetDir());