feat: add gemini tools (#120)

src/tools/impl/SearchFileContentGemini.ts

@@ -0,0 +1,29 @@
+/**
+ * Gemini CLI search_file_content tool - wrapper around Letta Code's Grep tool
+ * Uses Gemini's exact schema and description
+ */
+
+import { grep } from "./Grep";
+
+interface SearchFileContentGeminiArgs {
+  pattern: string;
+  dir_path?: string;
+  include?: string;
+}
+
+export async function search_file_content(
+  args: SearchFileContentGeminiArgs,
+): Promise<{ message: string }> {
+  // Adapt Gemini params to Letta Code's Grep tool
+  const lettaArgs = {
+    pattern: args.pattern,
+    path: args.dir_path,
+    glob: args.include,
+    output_mode: "content" as const, // Return actual matching lines, not just file paths
+  };
+
+  const result = await grep(lettaArgs);
+
+  // Grep returns { output: string, matches?, files? }
+  return { message: result.output };
+}