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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)}`;
}
},
};
}
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