Fix: source code inspection in interactive shells (#281)

* Support interactive shells for source inspection
* Add tool save e2e tests

pyproject.toml

@@ -60,6 +60,7 @@ all = [
   "smolagents[accelerate,audio,e2b,gradio,litellm,mcp,openai,transformers]",
 ]
 test = [
+  "ipython>=8.31.0", # for interactive environment tests
   "pytest>=8.1.0",
   "python-dotenv>=1.0.1",  # For test_all_docs
   "smolagents[all]",

src/smolagents/tool_validation.py

@@ -1,10 +1,9 @@
 import ast
 import builtins
 import inspect
-import textwrap
 from typing import Set
 
-from .utils import BASE_BUILTIN_MODULES
+from .utils import BASE_BUILTIN_MODULES, get_source
 
 
 _BUILTIN_NAMES = set(vars(builtins))
@@ -132,7 +131,7 @@ def validate_tool_attributes(cls, check_imports: bool = True) -> None:
     """
     errors = []
 
-    source = textwrap.dedent(inspect.getsource(cls))
+    source = get_source(cls)
 
     tree = ast.parse(source)
 

src/smolagents/tools.py

@@ -46,7 +46,7 @@ from ._function_type_hints_utils import (
 )
 from .tool_validation import MethodChecker, validate_tool_attributes
 from .types import handle_agent_input_types, handle_agent_output_types
-from .utils import _is_package_available, _is_pillow_available, instance_to_source
+from .utils import _is_package_available, _is_pillow_available, get_source, instance_to_source
 
 
 logger = logging.getLogger(__name__)
@@ -220,8 +220,8 @@ class Tool:
         # Save tool file
         if type(self).__name__ == "SimpleTool":
             # Check that imports are self-contained
-            source_code = inspect.getsource(self.forward).replace("@tool", "")
-            forward_node = ast.parse(textwrap.dedent(source_code))
+            source_code = get_source(self.forward).replace("@tool", "")
+            forward_node = ast.parse(source_code)
             # If tool was created using '@tool' decorator, it has only a forward pass, so it's simpler to just get its code
             method_checker = MethodChecker(set())
             method_checker.visit(forward_node)
@@ -229,7 +229,7 @@ class Tool:
             if len(method_checker.errors) > 0:
                 raise (ValueError("\n".join(method_checker.errors)))
 
-            forward_source_code = inspect.getsource(self.forward)
+            forward_source_code = get_source(self.forward)
             tool_code = textwrap.dedent(
                 f"""
             from smolagents import Tool

src/smolagents/utils.py

@@ -20,6 +20,7 @@ import importlib.util
 import inspect
 import json
 import re
+import textwrap
 import types
 from enum import IntEnum
 from functools import lru_cache
@@ -221,7 +222,7 @@ def get_method_source(method):
     """Get source code for a method, including bound methods."""
     if isinstance(method, types.MethodType):
         method = method.__func__
-    return inspect.getsource(method).strip()
+    return get_source(method)
 
 
 def is_same_method(method1, method2):
@@ -295,7 +296,7 @@ def instance_to_source(instance, base_cls=None):
     }
 
     for name, method in methods.items():
-        method_source = inspect.getsource(method)
+        method_source = get_source(method)
         # Clean up the indentation
         method_lines = method_source.split("\n")
         first_line = method_lines[0]
@@ -330,4 +331,56 @@ def instance_to_source(instance, base_cls=None):
     return "\n".join(final_lines)
 
 
+def get_source(obj) -> str:
+    """Get the source code of a class or callable object (e.g.: function, method).
+    First attempts to get the source code using `inspect.getsource`.
+    In a dynamic environment (e.g.: Jupyter, IPython), if this fails,
+    falls back to retrieving the source code from the current interactive shell session.
+
+    Args:
+        obj: A class or callable object (e.g.: function, method)
+
+    Returns:
+        str: The source code of the object, dedented and stripped
+
+    Raises:
+        TypeError: If object is not a class or callable
+        OSError: If source code cannot be retrieved from any source
+        ValueError: If source cannot be found in IPython history
+
+    Note:
+        TODO: handle Python standard REPL
+    """
+    if not (isinstance(obj, type) or callable(obj)):
+        raise TypeError(f"Expected class or callable, got {type(obj)}")
+
+    inspect_error = None
+    try:
+        return textwrap.dedent(inspect.getsource(obj)).strip()
+    except OSError as e:
+        # let's keep track of the exception to raise it if all further methods fail
+        inspect_error = e
+    try:
+        import IPython
+
+        shell = IPython.get_ipython()
+        if not shell:
+            raise ImportError("No active IPython shell found")
+        all_cells = "\n".join(shell.user_ns.get("In", [])).strip()
+        if not all_cells:
+            raise ValueError("No code cells found in IPython session")
+
+        tree = ast.parse(all_cells)
+        for node in ast.walk(tree):
+            if isinstance(node, (ast.ClassDef, ast.FunctionDef)) and node.name == obj.__name__:
+                return textwrap.dedent("\n".join(all_cells.split("\n")[node.lineno - 1 : node.end_lineno])).strip()
+        raise ValueError(f"Could not find source code for {obj.__name__} in IPython history")
+    except ImportError:
+        # IPython is not available, let's just raise the original inspect error
+        raise inspect_error
+    except ValueError as e:
+        # IPython is available but we couldn't find the source code, let's raise the error
+        raise e from inspect_error
+
+
 __all__ = ["AgentError"]

tests/test_utils.py

@@ -12,11 +12,19 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+import inspect
+import os
+import pathlib
+import tempfile
+import textwrap
 import unittest
 
 import pytest
+from IPython.core.interactiveshell import InteractiveShell
 
-from smolagents.utils import parse_code_blobs
+from smolagents import Tool
+from smolagents.tools import tool
+from smolagents.utils import get_source, parse_code_blobs
 
 
 class AgentTextTests(unittest.TestCase):
@@ -58,3 +66,287 @@ def multiply(a, b):
     return a * b"""
         result = parse_code_blobs(test_input)
         assert result == expected_output
+
+
+@pytest.fixture(scope="function")
+def ipython_shell():
+    """Reset IPython shell before and after each test."""
+    shell = InteractiveShell.instance()
+    shell.reset()  # Clean before test
+    yield shell
+    shell.reset()  # Clean after test
+
+
+@pytest.mark.parametrize(
+    "obj_name, code_blob",
+    [
+        ("test_func", "def test_func():\n    return 42"),
+        ("TestClass", "class TestClass:\n    ..."),
+    ],
+)
+def test_get_source_ipython(ipython_shell, obj_name, code_blob):
+    ipython_shell.run_cell(code_blob, store_history=True)
+    obj = ipython_shell.user_ns[obj_name]
+    assert get_source(obj) == code_blob
+
+
+def test_get_source_standard_class():
+    class TestClass: ...
+
+    source = get_source(TestClass)
+    assert source == "class TestClass: ..."
+    assert source == textwrap.dedent(inspect.getsource(TestClass)).strip()
+
+
+def test_get_source_standard_function():
+    def test_func(): ...
+
+    source = get_source(test_func)
+    assert source == "def test_func(): ..."
+    assert source == textwrap.dedent(inspect.getsource(test_func)).strip()
+
+
+def test_get_source_ipython_errors_empty_cells(ipython_shell):
+    test_code = textwrap.dedent("""class TestClass:\n    ...""").strip()
+    ipython_shell.user_ns["In"] = [""]
+    exec(test_code)
+    with pytest.raises(ValueError, match="No code cells found in IPython session"):
+        get_source(locals()["TestClass"])
+
+
+def test_get_source_ipython_errors_definition_not_found(ipython_shell):
+    test_code = textwrap.dedent("""class TestClass:\n    ...""").strip()
+    ipython_shell.user_ns["In"] = ["", "print('No class definition here')"]
+    exec(test_code)
+    with pytest.raises(ValueError, match="Could not find source code for TestClass in IPython history"):
+        get_source(locals()["TestClass"])
+
+
+def test_get_source_ipython_errors_type_error():
+    with pytest.raises(TypeError, match="Expected class or callable"):
+        get_source(None)
+
+
+def test_e2e_class_tool_save():
+    class TestTool(Tool):
+        name = "test_tool"
+        description = "Test tool description"
+        inputs = {
+            "task": {
+                "type": "string",
+                "description": "tool input",
+            }
+        }
+        output_type = "string"
+
+        def forward(self, task: str):
+            import IPython  # noqa: F401
+
+            return task
+
+    test_tool = TestTool()
+    with tempfile.TemporaryDirectory() as tmp_dir:
+        test_tool.save(tmp_dir)
+        assert set(os.listdir(tmp_dir)) == {"requirements.txt", "app.py", "tool.py"}
+        assert (
+            pathlib.Path(tmp_dir, "tool.py").read_text()
+            == """from smolagents.tools import Tool
+import IPython
+
+class TestTool(Tool):
+    name = "test_tool"
+    description = "Test tool description"
+    inputs = {'task': {'type': 'string', 'description': 'tool input'}}
+    output_type = "string"
+
+    def forward(self, task: str):
+        import IPython  # noqa: F401
+
+        return task
+
+    def __init__(self, *args, **kwargs):
+        self.is_initialized = False
+"""
+        )
+        requirements = set(pathlib.Path(tmp_dir, "requirements.txt").read_text().split())
+        assert requirements == {"IPython", "smolagents"}
+        assert (
+            pathlib.Path(tmp_dir, "app.py").read_text()
+            == """from smolagents import launch_gradio_demo
+from typing import Optional
+from tool import TestTool
+
+tool = TestTool()
+
+launch_gradio_demo(tool)
+"""
+        )
+
+
+def test_e2e_ipython_class_tool_save():
+    shell = InteractiveShell.instance()
+    with tempfile.TemporaryDirectory() as tmp_dir:
+        code_blob = textwrap.dedent(f"""
+        from smolagents.tools import Tool
+        class TestTool(Tool):
+            name = "test_tool"
+            description = "Test tool description"
+            inputs = {{"task": {{"type": "string",
+                    "description": "tool input",
+                }}
+            }}
+            output_type = "string"
+
+            def forward(self, task: str):
+                import IPython  # noqa: F401
+
+                return task
+        TestTool().save("{tmp_dir}")
+    """)
+        assert shell.run_cell(code_blob, store_history=True).success
+        assert set(os.listdir(tmp_dir)) == {"requirements.txt", "app.py", "tool.py"}
+        assert (
+            pathlib.Path(tmp_dir, "tool.py").read_text()
+            == """from smolagents.tools import Tool
+import IPython
+
+class TestTool(Tool):
+    name = "test_tool"
+    description = "Test tool description"
+    inputs = {'task': {'type': 'string', 'description': 'tool input'}}
+    output_type = "string"
+
+    def forward(self, task: str):
+        import IPython  # noqa: F401
+
+        return task
+
+    def __init__(self, *args, **kwargs):
+        self.is_initialized = False
+"""
+        )
+        requirements = set(pathlib.Path(tmp_dir, "requirements.txt").read_text().split())
+        assert requirements == {"IPython", "smolagents"}
+        assert (
+            pathlib.Path(tmp_dir, "app.py").read_text()
+            == """from smolagents import launch_gradio_demo
+from typing import Optional
+from tool import TestTool
+
+tool = TestTool()
+
+launch_gradio_demo(tool)
+"""
+        )
+
+
+def test_e2e_function_tool_save():
+    @tool
+    def test_tool(task: str) -> str:
+        """
+        Test tool description
+
+        Args:
+            task: tool input
+        """
+        import IPython  # noqa: F401
+
+        return task
+
+    with tempfile.TemporaryDirectory() as tmp_dir:
+        test_tool.save(tmp_dir)
+        assert set(os.listdir(tmp_dir)) == {"requirements.txt", "app.py", "tool.py"}
+        assert (
+            pathlib.Path(tmp_dir, "tool.py").read_text()
+            == """from smolagents import Tool
+from typing import Optional
+
+class SimpleTool(Tool):
+    name = "test_tool"
+    description = "Test tool description"
+    inputs = {"task":{"type":"string","description":"tool input"}}
+    output_type = "string"
+
+    def forward(self, task: str) -> str:
+        \"""
+        Test tool description
+
+        Args:
+            task: tool input
+        \"""
+        import IPython  # noqa: F401
+
+        return task"""
+        )
+        requirements = set(pathlib.Path(tmp_dir, "requirements.txt").read_text().split())
+        assert requirements == {"smolagents"}  # FIXME: IPython should be in the requirements
+        assert (
+            pathlib.Path(tmp_dir, "app.py").read_text()
+            == """from smolagents import launch_gradio_demo
+from typing import Optional
+from tool import SimpleTool
+
+tool = SimpleTool()
+
+launch_gradio_demo(tool)
+"""
+        )
+
+
+def test_e2e_ipython_function_tool_save():
+    shell = InteractiveShell.instance()
+    with tempfile.TemporaryDirectory() as tmp_dir:
+        code_blob = textwrap.dedent(f"""
+        from smolagents import tool
+
+        @tool
+        def test_tool(task: str) -> str:
+            \"""
+            Test tool description
+
+            Args:
+                task: tool input
+            \"""
+            import IPython  # noqa: F401
+
+            return task
+
+        test_tool.save("{tmp_dir}")
+        """)
+        assert shell.run_cell(code_blob, store_history=True).success
+        assert set(os.listdir(tmp_dir)) == {"requirements.txt", "app.py", "tool.py"}
+        assert (
+            pathlib.Path(tmp_dir, "tool.py").read_text()
+            == """from smolagents import Tool
+from typing import Optional
+
+class SimpleTool(Tool):
+    name = "test_tool"
+    description = "Test tool description"
+    inputs = {"task":{"type":"string","description":"tool input"}}
+    output_type = "string"
+
+    def forward(self, task: str) -> str:
+        \"""
+        Test tool description
+
+        Args:
+            task: tool input
+        \"""
+        import IPython  # noqa: F401
+
+        return task"""
+        )
+        requirements = set(pathlib.Path(tmp_dir, "requirements.txt").read_text().split())
+        assert requirements == {"smolagents"}  # FIXME: IPython should be in the requirements
+        assert (
+            pathlib.Path(tmp_dir, "app.py").read_text()
+            == """from smolagents import launch_gradio_demo
+from typing import Optional
+from tool import SimpleTool
+
+tool = SimpleTool()
+
+launch_gradio_demo(tool)
+"""
+        )