fix: add parameter validation to all tools to prevent undefined insertions (#14)

Co-authored-by: Letta <noreply@letta.com>

src/tests/tools/edit.test.ts

@@ -65,4 +65,50 @@ describe("Edit tool", () => {
     expect(readFileSync(file, "utf-8")).toBe("qux bar qux baz qux");
     expect(result.replacements).toBe(3);
   });
+
+  test("throws error when file_path is missing", async () => {
+    await expect(
+      edit({
+        old_string: "foo",
+        new_string: "bar",
+      } as any),
+    ).rejects.toThrow(/missing required parameter.*file_path/);
+  });
+
+  test("throws error when old_string is missing", async () => {
+    testDir = new TestDirectory();
+    const file = testDir.createFile("test.txt", "Hello, World!");
+
+    await expect(
+      edit({
+        file_path: file,
+        new_string: "bar",
+      } as any),
+    ).rejects.toThrow(/missing required parameter.*old_string/);
+  });
+
+  test("throws error when new_string is missing", async () => {
+    testDir = new TestDirectory();
+    const file = testDir.createFile("test.txt", "Hello, World!");
+
+    await expect(
+      edit({
+        file_path: file,
+        old_string: "foo",
+      } as any),
+    ).rejects.toThrow(/missing required parameter.*new_string/);
+  });
+
+  test("throws error when using typo'd parameter name (new_str instead of new_string)", async () => {
+    testDir = new TestDirectory();
+    const file = testDir.createFile("test.txt", "Hello, World!");
+
+    await expect(
+      edit({
+        file_path: file,
+        old_string: "World",
+        new_str: "Bun",
+      } as any),
+    ).rejects.toThrow(/missing required parameter.*new_string/);
+  });
 });