1 files changed, 33 insertions, 0 deletions
diff --git a/packages/core/src/tools/read-file.ts b/packages/core/src/tools/read-file.ts
new file mode 100644
index 0000000..476f243
--- /dev/null
+++ b/packages/core/src/tools/read-file.ts
@@ -0,0 +1,33 @@
+import { readFile } from "node:fs/promises";
+import { join, resolve } from "node:path";
+import { z } from "zod";
+import type { ToolDefinition } from "../types/index.js";
+
+export function createReadFileTool(workingDirectory: string): ToolDefinition {
+	return {
+		name: "read_file",
+		description: "Read the contents of a file relative to the working directory.",
+		parameters: z.object({
+			path: z.string().describe("Path to the file, relative to the working directory"),
+		}),
+		execute: async (args: Record<string, unknown>): Promise<string> => {
+			const filePath = args.path as string;
+			const absolutePath = resolve(join(workingDirectory, filePath));
+			const absoluteWorkDir = resolve(workingDirectory);
+
+			if (!absolutePath.startsWith(`${absoluteWorkDir}/`) && absolutePath !== absoluteWorkDir) {
+				return `Error: Path "${filePath}" is outside the working directory.`;
+			}
+
+			try {
+				return await readFile(absolutePath, "utf8");
+			} catch (err) {
+				const code = (err as NodeJS.ErrnoException).code;
+				if (code === "ENOENT") {
+					return `Error: File "${filePath}" not found.`;
+				}
+				return `Error reading file: ${err instanceof Error ? err.message : String(err)}`;
+			}
+		},
+	};
+}