Add strip_fences option and fix exec() scoping for nested functions

- Add strip_fences field to PromptStep for removing markdown code fences
- Fix exec() to use same dict for globals and locals, allowing nested
  functions to access module-level imports
- Add GUI checkbox for strip_fences option
- Update CLAUDE.md with improved documentation

Co-Authored-By: Claude Opus 4.5 <[email protected]>

src/cmdforge/gui/dialogs/step_dialog.py

@@ -5,7 +5,8 @@ import ast
 from PySide6.QtWidgets import (
     QDialog, QVBoxLayout, QFormLayout, QLineEdit,
     QComboBox, QPushButton, QHBoxLayout, QLabel,
-    QPlainTextEdit, QSplitter, QGroupBox, QTextEdit, QMessageBox
+    QPlainTextEdit, QSplitter, QGroupBox, QTextEdit, QMessageBox,
+    QCheckBox
 )
 from PySide6.QtCore import Qt, QThread, Signal
 
@@ -68,6 +69,10 @@ class PromptStepDialog(QDialog):
         self.output_input.setText("response")
         form.addRow("Output variable:", self.output_input)
 
+        # Strip fences checkbox
+        self.strip_fences_check = QCheckBox("Strip markdown code fences from output")
+        form.addRow("", self.strip_fences_check)
+
         layout.addLayout(form)
 
         # Prompt text
@@ -118,6 +123,7 @@ class PromptStepDialog(QDialog):
 
         self.output_input.setText(step.output_var)
         self.prompt_input.setPlainText(step.prompt)
+        self.strip_fences_check.setChecked(step.strip_fences)
 
     def _validate_and_accept(self):
         """Validate and accept."""
@@ -146,7 +152,8 @@ class PromptStepDialog(QDialog):
             provider=self.provider_combo.currentText(),
             output_var=self.output_input.text().strip(),
             profile=profile,
-            name=name
+            name=name,
+            strip_fences=self.strip_fences_check.isChecked()
         )
 
 

src/cmdforge/runner.py

@@ -221,7 +221,13 @@ def execute_prompt_step(
         print(f"Error in prompt step: {result.error}", file=sys.stderr)
         return "", False
 
-    return result.text, True
+    text = result.text
+    if step.strip_fences:
+        import re
+        text = re.sub(r'^```\w*\n', '', text.strip())
+        text = re.sub(r'\n```\s*$', '', text)
+
+    return text, True
 
 
 def execute_code_step(
@@ -245,11 +251,15 @@ def execute_code_step(
     code = substitute_variables(step.code, variables, warn_non_scalar=verbose)
 
     # Create execution environment with variables
-    local_vars = dict(variables)
+    # IMPORTANT: Use the same dict for both globals and locals.
+    # When exec() gets separate dicts, nested functions can't access
+    # module-level imports (they look in globals, not the exec's locals).
+    local_vars = {"__builtins__": __builtins__}
+    local_vars.update(variables)
 
     try:
         # Execute the code with substituted variables
-        exec(code, {"__builtins__": __builtins__}, local_vars)
+        exec(code, local_vars, local_vars)
 
         # Support comma-separated output vars (e.g., "a, b, c")
         output_vars = [v.strip() for v in step.output_var.split(',')]

src/cmdforge/tool.py

@@ -100,6 +100,7 @@ class PromptStep:
     prompt_file: Optional[str] = None  # Optional filename for external prompt
     profile: Optional[str] = None  # Optional AI persona profile name
     name: Optional[str] = None  # Optional display name for the step
+    strip_fences: bool = False  # Strip markdown code fences from output
 
     def to_dict(self) -> dict:
         d = {
@@ -114,6 +115,8 @@ class PromptStep:
             d["profile"] = self.profile
         if self.name:
             d["name"] = self.name
+        if self.strip_fences:
+            d["strip_fences"] = self.strip_fences
         return d
 
     @classmethod
@@ -124,7 +127,8 @@ class PromptStep:
             output_var=data["output_var"],
             prompt_file=data.get("prompt_file"),
             profile=data.get("profile"),
-            name=data.get("name")
+            name=data.get("name"),
+            strip_fences=data.get("strip_fences", False)
         )