remove __pycache__

.gitignore

@@ -1 +1,3 @@
 .env
+__pycache__
+**/__pycache__/

calculator/README.md

@@ -0,0 +1 @@
+# calculator

calculator/lorem.txt

@@ -0,0 +1 @@
+wait, this isn't lorem ipsum

calculator/main.py

@@ -0,0 +1,23 @@
+import sys
+from pkg.calculator import Calculator
+from pkg.render import render
+
+def main():
+    calculator = Calculator()
+    if len(sys.argv) <= 1:
+        print("Calculator App")
+        print('Usage: python main.py "<expression>"')
+        print('Example: python main.py "3 + 5"')
+        return
+
+    expression = " ".join(sys.argv[1:])
+    try:
+        result = calculator.evaluate(expression)
+        to_print = render(expression, result)
+        print(to_print)
+    except Exception as e:
+        print(f"Error: {e}")
+
+
+if __name__ == "__main__":
+    main()

calculator/pkg/calculator.py

@@ -0,0 +1,59 @@
+class Calculator:
+    def __init__(self):
+        self.operators = {
+            "+": lambda a, b: a + b,
+            "-": lambda a, b: a - b,
+            "*": lambda a, b: a * b,
+            "/": lambda a, b: a / b,
+        }
+        self.precedence = {
+            "+": 1,
+            "-": 1,
+            "*": 2,
+            "/": 2,
+        }
+
+    def evaluate(self, expression):
+        if not expression or expression.isspace():
+            return None
+        tokens = expression.strip().split()
+        return self._evaluate_infix(tokens)
+
+    def _evaluate_infix(self, tokens):
+        values = []
+        operators = []
+
+        for token in tokens:
+            if token in self.operators:
+                while (
+                    operators
+                    and operators[-1] in self.operators
+                    and self.precedence[operators[-1]] >= self.precedence[token]
+                ):
+                    self._apply_operator(operators, values)
+                operators.append(token)
+            else:
+                try:
+                    values.append(float(token))
+                except ValueError:
+                    raise ValueError(f"invalid token: {token}")
+
+        while operators:
+            self._apply_operator(operators, values)
+
+        if len(values) != 1:
+            raise ValueError("invalid expression")
+
+        return values[0]
+
+    def _apply_operator(self, operators, values):
+        if not operators:
+            return
+
+        operator = operators.pop()
+        if len(values) < 2:
+            raise ValueError(f"not enough operands for operator {operator}")
+
+        b = values.pop()
+        a = values.pop()
+        values.append(self.operators[operator](a, b))

calculator/pkg/render.py

@@ -0,0 +1,21 @@
+def render(expression, result):
+    if isinstance(result, float) and result.is_integer():
+        result_str = str(int(result))
+    else:
+        result_str = str(result)
+
+    box_width = max(len(expression), len(result_str)) + 4
+
+    box = []
+    box.append("┌" + "─" * box_width + "┐")
+    box.append(
+        "│" + " " * 2 + expression + " " * (box_width - len(expression) - 2) + "│"
+    )
+    box.append("│" + " " * box_width + "│")
+    box.append("│" + " " * 2 + "=" + " " * (box_width - 3) + "│")
+    box.append("│" + " " * box_width + "│")
+    box.append(
+        "│" + " " * 2 + result_str + " " * (box_width - len(result_str) - 2) + "│"
+    )
+    box.append("└" + "─" * box_width + "┘")
+    return "\n".join(box)

calculator/test_output.txt

@@ -0,0 +1 @@
+hello world

calculator/tests.py

@@ -0,0 +1,47 @@
+import unittest
+from pkg.calculator import Calculator
+
+
+class TestCalculator(unittest.TestCase):
+    def setUp(self):
+        self.calculator = Calculator()
+
+    def test_addition(self):
+        result = self.calculator.evaluate("3 + 5")
+        self.assertEqual(result, 8)
+
+    def test_subtraction(self):
+        result = self.calculator.evaluate("10 - 4")
+        self.assertEqual(result, 6)
+
+    def test_multiplication(self):
+        result = self.calculator.evaluate("3 * 4")
+        self.assertEqual(result, 12)
+
+    def test_division(self):
+        result = self.calculator.evaluate("10 / 2")
+        self.assertEqual(result, 5)
+
+    def test_nested_expression(self):
+        result = self.calculator.evaluate("3 * 4 + 5")
+        self.assertEqual(result, 17)
+
+    def test_complex_expression(self):
+        result = self.calculator.evaluate("2 * 3 - 8 / 2 + 5")
+        self.assertEqual(result, 7)
+
+    def test_empty_expression(self):
+        result = self.calculator.evaluate("")
+        self.assertIsNone(result)
+
+    def test_invalid_operator(self):
+        with self.assertRaises(ValueError):
+            self.calculator.evaluate("$ 3 5")
+
+    def test_not_enough_operands(self):
+        with self.assertRaises(ValueError):
+            self.calculator.evaluate("+ 3")
+
+
+if __name__ == "__main__":
+    unittest.main()

functions/call_function.py

@@ -0,0 +1,57 @@
+import os
+from google.genai import types
+
+from functions.get_files_info import get_files_info
+from functions.get_file_content import get_file_content
+from functions.write_file import write_file
+from functions.run_python_file import run_python_file
+
+
+def call_function(function_call_part, verbose=False):
+
+    function_name = function_call_part.name
+    args = dict(function_call_part.args or {})
+
+    args["working_directory"] = "./calculator"
+
+    function_map = {
+        "get_files_info": get_files_info,
+        "get_file_content": get_file_content,
+        "write_file": write_file,
+        "run_python_file": run_python_file,
+    }
+
+    if verbose:
+        print(f"Calling function: {function_name}({args})")
+    else:
+        print(f" - Calling function: {function_name}")
+
+    if function_name not in function_map:
+        return types.Content(
+            role="tool",
+            parts=[
+                types.Part.from_function_response(
+                    name=function_name,
+                    response={"error": f"Unknown function: {function_name}"},
+                )
+            ],
+        )
+
+    try:
+        function_result = function_map[function_name](**args)
+    except Exception as e:
+        function_result = f"Error executing function: {e}"
+
+    tool_response = types.Content(
+        role="tool",
+        parts=[
+            types.Part.from_function_response(
+                name=function_name, response={"result": function_result}
+            )
+        ],
+    )
+
+    if verbose:
+        print(f"-> {tool_response.parts[0].function_response.response}")
+
+    return tool_response

functions/config.py

@@ -0,0 +1 @@
+MAX_FILE_CONTENT_CHARS = 10000

functions/get_file_content.py

@@ -0,0 +1,46 @@
+import os
+from functions.config import MAX_FILE_CONTENT_CHARS
+from google.genai import types
+
+schema_get_file_content = types.FunctionDeclaration(
+    name="get_file_content",
+    description="Reads and returns the contents of a file, truncated if too large, constrained to the working directory.",
+    parameters=types.Schema(
+        type=types.Type.OBJECT,
+        properties={
+            "file_path": types.Schema(
+                type=types.Type.STRING,
+                description="Path to the file, relative to the working directory.",
+            ),
+        },
+        required=["file_path"],
+    ),
+)
+
+
+def get_file_content(working_directory, file_path):
+    try:
+        full_path = os.path.join(working_directory, file_path)
+
+        abs_working_directory = os.path.abspath(working_directory)
+        abs_target_path = os.path.abspath(full_path)
+
+        if not abs_target_path.startswith(abs_working_directory):
+            return (
+                f'Error: Cannot read "{file_path}" as it is outside the permitted working directory'
+            )
+
+        if not os.path.isfile(abs_target_path):
+            return f'Error: File not found or is not a regular file: "{file_path}"'
+
+        with open(abs_target_path, "r", encoding="utf-8", errors="replace") as f:
+            content = f.read()
+
+        if len(content) > MAX_FILE_CONTENT_CHARS:
+            truncated = content[:MAX_FILE_CONTENT_CHARS]
+            return truncated + f'\n[...File "{file_path}" truncated at {MAX_FILE_CONTENT_CHARS} characters]'
+        else:
+            return content
+
+    except Exception as e:
+        return f"Error: {e}"

functions/get_files_info.py

@@ -0,0 +1,48 @@
+import os
+from google.genai import types
+
+schema_get_files_info = types.FunctionDeclaration(
+    name="get_files_info",
+    description="Lists files in the specified directory along with their sizes, constrained to the working directory.",
+    parameters=types.Schema(
+        type=types.Type.OBJECT,
+        properties={
+            "directory": types.Schema(
+                type=types.Type.STRING,
+                description="The directory to list files from, relative to the working directory. If not provided, lists files in the working directory itself.",
+            ),
+        },
+    ),
+)
+
+def get_files_info(working_directory, directory="."):
+    try:
+        full_path = os.path.join(working_directory, directory)
+
+        abs_working_directory = os.path.abspath(working_directory)
+        abs_target_path = os.path.abspath(full_path)
+
+        if not abs_target_path.startswith(abs_working_directory):
+            return (
+                f'Error: Cannot list "{directory}" as it is outside the permitted working directory'
+            )
+
+        if not os.path.isdir(abs_target_path):
+            return f'Error: "{directory}" is not a directory'
+
+        results = []
+        for entry in os.listdir(abs_target_path):
+            entry_path = os.path.join(abs_target_path, entry)
+            try:
+                is_dir = os.path.isdir(entry_path)
+                size = os.path.getsize(entry_path)
+                results.append(
+                    f"- {entry}: file_size={size} bytes, is_dir={str(is_dir)}"
+                )
+            except Exception as e:
+                results.append(f"- {entry}: Error accessing file info ({e})")
+
+        return "\n".join(results)
+
+    except Exception as e:
+        return f"Error: {e}"

functions/run_python_file.py

@@ -0,0 +1,66 @@
+import os
+import subprocess
+from google.genai import types
+
+schema_run_python_file = types.FunctionDeclaration(
+    name="run_python_file",
+    description="Executes a Python file with optional arguments, constrained to the working directory.",
+    parameters=types.Schema(
+        type=types.Type.OBJECT,
+        properties={
+            "file_path": types.Schema(
+                type=types.Type.STRING,
+                description="Path to the Python file, relative to the working directory.",
+            ),
+            "args": types.Schema(
+                type=types.Type.ARRAY,
+                description="List of arguments to pass to the Python script.",
+                items=types.Schema(type=types.Type.STRING),
+            ),
+        },
+        required=["file_path"],
+    ),
+)
+
+def run_python_file(working_directory, file_path, args=[]):
+    try:
+        full_path = os.path.join(working_directory, file_path)
+        abs_working_directory = os.path.abspath(working_directory)
+        abs_target_path = os.path.abspath(full_path)
+
+        if not abs_target_path.startswith(abs_working_directory):
+            return (
+                f'Error: Cannot execute "{file_path}" as it is outside the permitted working directory'
+            )
+
+        if not os.path.exists(abs_target_path):
+            return f'Error: File "{file_path}" not found.'
+
+        if not file_path.endswith(".py"):
+            return f'Error: "{file_path}" is not a Python file.'
+
+        completed = subprocess.run(
+            ["python3", abs_target_path] + args,
+            cwd=abs_working_directory,
+            capture_output=True,
+            text=True,
+            timeout=30,
+        )
+
+        result_parts = []
+        if completed.stdout.strip():
+            result_parts.append("STDOUT:\n" + completed.stdout.strip())
+        if completed.stderr.strip():
+            result_parts.append("STDERR:\n" + completed.stderr.strip())
+        if completed.returncode != 0:
+            result_parts.append(f"Process exited with code {completed.returncode}")
+
+        if not result_parts:
+            return "No output produced."
+
+        return "\n".join(result_parts)
+
+    except subprocess.TimeoutExpired:
+        return "Error: Process timed out after 30 seconds."
+    except Exception as e:
+        return f"Error: executing Python file: {e}"

functions/write_file.py

@@ -0,0 +1,47 @@
+import os
+from google.genai import types
+
+schema_write_file = types.FunctionDeclaration(
+    name="write_file",
+    description="Writes or overwrites file contents within the working directory.",
+    parameters=types.Schema(
+        type=types.Type.OBJECT,
+        properties={
+            "file_path": types.Schema(
+                type=types.Type.STRING,
+                description="Path to the file relative to the working directory.",
+            ),
+            "content": types.Schema(
+                type=types.Type.STRING,
+                description="The text content to write into the file.",
+            ),
+        },
+        required=["file_path", "content"],
+    ),
+)
+
+
+def write_file(working_directory, file_path, content):
+    try:
+        full_path = os.path.join(working_directory, file_path)
+        abs_working_directory = os.path.abspath(working_directory)
+        abs_target_path = os.path.abspath(full_path)
+
+        if not abs_target_path.startswith(abs_working_directory):
+            return (
+                f'Error: Cannot write to "{file_path}" as it is outside the permitted working directory'
+            )
+
+        parent_dir = os.path.dirname(abs_target_path)
+        if parent_dir and not os.path.exists(parent_dir):
+            os.makedirs(parent_dir, exist_ok=True)
+
+        with open(abs_target_path, "w", encoding="utf-8") as f:
+            f.write(content)
+
+        return (
+            f'Successfully wrote to "{file_path}" ({len(content)} characters written)'
+        )
+
+    except Exception as e:
+        return f"Error: {e}"

main.py

@@ -2,6 +2,37 @@ import os
 import sys
 from dotenv import load_dotenv
 from google import genai
+from google.genai import types
+from functions.call_function import call_function
+from functions.get_files_info import schema_get_files_info
+from functions.get_file_content import schema_get_file_content
+from functions.run_python_file import schema_run_python_file
+from functions.write_file import schema_write_file
+
+available_functions = types.Tool(
+    function_declarations=[
+        schema_get_files_info,
+        schema_get_file_content,
+        schema_run_python_file,
+        schema_write_file,
+    ]
+)
+
+system_prompt = """
+You are a helpful AI coding agent.
+
+When a user asks a question or makes a request, make a function call plan. 
+You can perform the following operations:
+
+- List files and directories
+- Read file contents
+- Execute Python files with optional arguments
+- Write or overwrite files
+
+All paths you provide should be relative to the working directory. 
+You do not need to specify the working directory in your function calls 
+as it is automatically injected for security reasons.
+"""
 
 load_dotenv()
 api_key = os.environ.get("GEMINI_API_KEY")
@@ -10,20 +41,63 @@ client = genai.Client(api_key=api_key)
 
 def main():
     if len(sys.argv) < 2:
-        print("Error: No prompt provided.\nUsage: uv run main.py \"<your prompt here>\"")
+        print("Error: No prompt provided.\nUsage: uv run main.py \"<your prompt here>\" [--verbose]")
         sys.exit(1)
 
-    user_prompt = sys.argv[1]
+    args = sys.argv[1:]
 
-    response = client.models.generate_content(
-        model="gemini-2.0-flash-001",
-        contents=user_prompt
-    )
+    verbose = False
+    if "--verbose" in args:
+        verbose = True
+        args.remove("--verbose")
 
-    print(response.text)
+    user_prompt = " ".join(args)
 
-    print(f"Prompt tokens: {response.usage_metadata.prompt_token_count}")
-    print(f"Response tokens: {response.usage_metadata.candidates_token_count}")
+    if verbose:
+        print(f'User prompt: "{user_prompt}"')
+
+    messages = [
+        types.Content(role="user", parts=[types.Part.from_text(text=user_prompt)]),
+    ]
+
+    for iteration in range(20):
+        response = client.models.generate_content(
+            model="gemini-2.0-flash-001",
+            contents=messages,
+            config=types.GenerateContentConfig(
+                tools=[available_functions],
+                system_instruction=system_prompt,
+            ),
+        )
+
+        if not response.candidates:
+            print("No response, stopping.")
+            break
+
+        # String representation of final text (if the model is done)
+        candidate = response.candidates[0]
+        messages.append(candidate.content)
+
+        has_function_call = False
+        final_texts = []
+
+        for part in candidate.content.parts:
+            if part.function_call:
+                has_function_call = True
+                function_result = call_function(part.function_call, verbose=verbose)
+                messages.append(function_result)
+            elif part.text:
+                final_texts.append(part.text)
+
+        # Only finish if there was NO tool call in this iteration
+        if not has_function_call and final_texts:
+            print("Final response:")
+            print("\n".join(final_texts))
+            break
+
+    if verbose:
+        print(f"Prompt tokens: {response.usage_metadata.prompt_token_count}")
+        print(f"Response tokens: {response.usage_metadata.candidates_token_count}")
 
 
 

tests.py

@@ -0,0 +1,29 @@
+from functions.run_python_file import run_python_file
+
+
+def run_tests():
+    cases = [
+        ("calculator", "main.py", []),
+        ("calculator", "main.py", ["3 + 5"]),
+        ("calculator", "tests.py", []),
+        ("calculator", "../main.py", []),
+        ("calculator", "nonexistent.py", []),
+    ]
+
+    for working_dir, file_path, args in cases:
+        if args:
+            print(f'run_python_file("{working_dir}", "{file_path}", {args}):')
+        else:
+            print(f'run_python_file("{working_dir}", "{file_path}"):')
+
+        result = run_python_file(working_dir, file_path, args)
+
+        print("Result:")
+        for line in result.splitlines():
+            print(" " + line)
+
+        print()
+
+
+if __name__ == "__main__":
+    run_tests()