Treat grep no matches as nonfatal

app/tools/plugins/shell_exec/__init__.py

@@ -24,10 +24,12 @@ class Tool(BaseTool):
             stdin_data=str(stdin_secret) if stdin_secret is not None else None,
         )
         output = completed.stdout if completed.returncode == 0 else completed.stderr or completed.stdout
+        grep_no_matches = "grep" in command and completed.returncode == 1 and not completed.stderr
+        ok = completed.returncode == 0 or grep_no_matches
         return ToolResult(
             tool=self.name,
-            ok=completed.returncode == 0,
+            ok=ok,
             output=output,
-            error=None if completed.returncode == 0 else f"Command failed with exit code {completed.returncode}",
-            metadata={"exit_code": completed.returncode},
-        )
+            error=None if ok else f"Command failed with exit code {completed.returncode}",
+            metadata={"exit_code": completed.returncode, "no_matches": grep_no_matches},
+        )

app/tools/shell_exec.py

@@ -29,6 +29,8 @@ class ShellExecTool(BaseTool):
         )
         output = completed.stdout if completed.returncode == 0 else completed.stderr or completed.stdout
         error_output = completed.stderr or completed.stdout
+        grep_no_matches = "grep" in command and completed.returncode == 1 and not completed.stderr
+        ok = completed.returncode == 0 or grep_no_matches
         
         is_sudo_error = (
             completed.returncode != 0 and 
@@ -40,8 +42,8 @@ class ShellExecTool(BaseTool):
         
         return ToolResult(
             tool=self.name,
-            ok=completed.returncode == 0,
+            ok=ok,
             output=output,
-            error=None if completed.returncode == 0 else f"Command failed with exit code {completed.returncode}",
-            metadata={"exit_code": completed.returncode, "needs_sudo": is_sudo_error},
+            error=None if ok else f"Command failed with exit code {completed.returncode}",
+            metadata={"exit_code": completed.returncode, "needs_sudo": is_sudo_error, "no_matches": grep_no_matches},
         )