Fix fsRead validation requiring file path, update tool_index.json

Author: jguoamz

packages/core/src/codewhispererChat/tools/fsRead.ts

@@ -34,10 +34,10 @@ export class FsRead {
         this.fsPath = sanitized
 
         const fileUri = vscode.Uri.file(this.fsPath)
-        let exists: boolean
+        let fileExists: boolean
         try {
-            exists = await fs.exists(fileUri)
-            if (!exists) {
+            fileExists = await fs.existsFile(fileUri)
+            if (!fileExists) {
                 throw new Error(`Path: "${this.fsPath}" does not exist or cannot be accessed.`)
             }
         } catch (err) {

packages/core/src/codewhispererChat/tools/tool_index.json

@@ -75,7 +75,7 @@
     },
     "listDirectory": {
         "name": "listDirectory",
-        "description": "List the contents of a directory. Use this tool for discovery, before using more targeted tools like fsRead. Useful to try to understand the file structure before diving deeper into specific files. Can be used to explore the codebase.",
+        "description": "List the contents of a directory\n * Use this tool for discovery, before using more targeted tools like fsRead.\n *Useful to try to understand the file structure before diving deeper into specific files.\n *Can be used to explore the codebase.",
         "inputSchema": {
             "type": "object",
             "properties": {
@@ -85,7 +85,7 @@
                 },
                 "path": {
                     "type": "string",
-                    "description": "Absolute path to file or directory, e.g. `/repo/file.py` or `/repo`."
+                    "description": "Absolute path to a directory, e.g., `/repo`."
                 }
             },
             "required": ["path"]