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diff --git a/js/src/tool/diagnostics.ts b/js/src/tool/diagnostics.ts
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+++ b/js/src/tool/diagnostics.ts
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+import { z } from "zod";
+import { Tool } from "./tool";
+import path from "path";
+import { LSP } from "../lsp";
+import { App } from "../app";
+
+export const DiagnosticsTool = Tool.define({
+  name: "diagnostics",
+  description: `Get diagnostics for a file and/or project.
+
+WHEN TO USE THIS TOOL:
+- Use when you need to check for errors or warnings in your code
+- Helpful for debugging and ensuring code quality
+- Good for getting a quick overview of issues in a file or project
+
+HOW TO USE:
+- Provide a path to a file to get diagnostics for that file
+- Results are displayed in a structured format with severity levels
+
+FEATURES:
+- Displays errors, warnings, and hints
+- Groups diagnostics by severity
+- Provides detailed information about each diagnostic
+
+LIMITATIONS:
+- Results are limited to the diagnostics provided by the LSP clients
+- May not cover all possible issues in the code
+- Does not provide suggestions for fixing issues
+
+TIPS:
+- Use in conjunction with other tools for a comprehensive code review
+- Combine with the LSP client for real-time diagnostics`,
+  parameters: z.object({
+    path: z.string().describe("The path to the file to get diagnostics."),
+  }),
+  execute: async (args) => {
+    const app = await App.use();
+    const normalized = path.isAbsolute(args.path)
+      ? args.path
+      : path.join(app.root, args.path);
+    await LSP.file(normalized);
+    const diagnostics = await LSP.diagnostics();
+    const file = diagnostics[normalized];
+    return {
+      metadata: {
+        diagnostics,
+      },
+      output: file?.length
+        ? file.map(LSP.Diagnostic.pretty).join("\n")
+        : "No errors found",
+    };
+  },
+});
+
+const x: number = "asd";
+