diff --git a/scripts/dafny_shell_validator.sh b/scripts/dafny_shell_validator.sh
new file mode 100644
index 0000000..a41c85d
--- /dev/null
+++ b/scripts/dafny_shell_validator.sh
@@ -0,0 +1,12 @@
+#!/bin/bash
+
+var1=$1;
+var2=$2;
+var3=$3;
+
+echo "$var1" > $var3;
+~/Nagini-Convertion/Binaries/Dafny validate $var3;
+echo "module Gen {"
+echo -e "$var2"
+echo "}"
+cat $var3
diff --git a/verified_cogen/experiments/incremental_run.py b/verified_cogen/experiments/incremental_run.py
index 4ab9522..7f3afbd 100644
--- a/verified_cogen/experiments/incremental_run.py
+++ b/verified_cogen/experiments/incremental_run.py
@@ -89,7 +89,7 @@ def main():
         )
         rewriter = construct_rewriter(extension_from_file_list([file]), args.manual_rewriters)
         runner = make_runner_cls(args.bench_type, extension_from_file_list([file]), config)(
-            llm, logger, verifier, rewriter
+            llm, logger, verifier, rewriter, None
         )
         display_name = rename_file(file)
         marker_name = str(file.relative_to(directory))
diff --git a/verified_cogen/main.py b/verified_cogen/main.py
index 456db10..d47b978 100644
--- a/verified_cogen/main.py
+++ b/verified_cogen/main.py
@@ -20,7 +20,7 @@
     NaginiRewriterFixingAST,
 )
 from verified_cogen.runners.step_by_step import StepByStepRunner
-from verified_cogen.runners.validating import ValidatingRunner
+from verified_cogen.runners.validating import ValidatingRunner, Validator
 from verified_cogen.tools import (
     ext_glob,
     extension_from_file_list,
@@ -39,7 +39,7 @@
 def run_once(
     files: list[Path],
     args: ProgramArgs,
-    runner_cls: Callable[[LLM, Logger, Verifier, Optional[Rewriter]], Runner],
+    runner_cls: Callable[[LLM, Logger, Verifier, Optional[Rewriter], Optional[Validator]], Runner],
     verifier: Verifier,
     mode: Mode,
     rewriter: Optional[Rewriter],
@@ -58,7 +58,7 @@ def run_once(
             args.temperature,
         )
 
-        runner = runner_cls(llm, logger, verifier, rewriter)
+        runner = runner_cls(llm, logger, verifier, rewriter, None)
 
         retries = args.retries + 1
         tries = None
@@ -125,12 +125,13 @@ def construct_rewriter(extension: str, runner_types: List[str]) -> Optional[Rewr
 
 def make_runner_cls(
     bench_type: str, extension: str, config: RunnerConfig
-) -> Callable[[LLM, Logger, Verifier, Optional[Rewriter]], Runner]:
+) -> Callable[[LLM, Logger, Verifier, Optional[Rewriter], Optional[Validator]], Runner]:
     def runner_cls(
         llm: LLM,
         logger: Logger,
         verifier: Verifier,
         rewriter: Optional[Rewriter] = None,
+        validator: Optional[Validator] = None,
     ):
         if bench_type == "invariants":
             return InvariantRunner(llm, logger, verifier, config)
@@ -142,6 +143,7 @@ def runner_cls(
             return ValidatingRunner(
                 InvariantRunner(llm, logger, verifier, config, rewriter),
                 LanguageDatabase().get(extension),
+                validator,
             )
         elif bench_type == "step-by-step":
             return ValidatingRunner(
@@ -206,6 +208,7 @@ def main():
             logger,
             verifier,
             rewriter,
+            None,
         )
         for file in files:
             with open(file) as f:
@@ -248,7 +251,9 @@ def main():
             args.prompts_directory,
             args.temperature,
         )
-        runner = make_runner_cls(args.bench_type, Path(args.input).suffix[1:], config)(llm, logger, verifier, None)
+        runner = make_runner_cls(args.bench_type, Path(args.input).suffix[1:], config)(
+            llm, logger, verifier, None, None
+        )
         tries = runner.run_on_file(mode, args.tries, args.input)
         if tries == 0:
             print("Verified without modification")
diff --git a/verified_cogen/runners/validating.py b/verified_cogen/runners/validating.py
index c48c905..d8789d0 100644
--- a/verified_cogen/runners/validating.py
+++ b/verified_cogen/runners/validating.py
@@ -1,7 +1,9 @@
+import pathlib
 from abc import ABC, abstractmethod
 from subprocess import CalledProcessError, run
 from typing import List, Optional
 
+from verified_cogen import get_cache_dir
 from verified_cogen.llm import prompts
 from verified_cogen.llm.llm import LLM
 from verified_cogen.runners import Runner
@@ -10,11 +12,6 @@
 
 
 class Validator(ABC):
-    @abstractmethod
-    def add_validators(self, prg: str, inv_prg: str) -> str: ...
-
-
-class LanguageValidator(Validator):
     language: Language
     remove_helpers: bool
 
@@ -22,6 +19,11 @@ def __init__(self, language: Language, remove_helpers: bool):
         self.language = language
         self.remove_helpers = remove_helpers
 
+    @abstractmethod
+    def add_validators(self, prg: str, inv_prg: str) -> str: ...
+
+
+class LanguageValidator(Validator):
     def add_validators(self, prg: str, inv_prg: str) -> str:
         validators = self.language.generate_validators(prg, not self.remove_helpers)
         comment = self.language.simple_comment
@@ -31,14 +33,39 @@ def add_validators(self, prg: str, inv_prg: str) -> str:
 
 class ShellValidator(Validator):
     cli_command: list[str]
+    LLM_GENERATED_CODE_DIR = pathlib.Path(get_cache_dir()) / "llm-generated-code"
+    LLM_GENERATED_VAL_DIR = pathlib.Path(get_cache_dir()) / "llm-generated-val"
+    tries = 0
+    cur_name: str
 
-    def __init__(self, cli_command: list[str]):
+    def __init__(self, cli_command: list[str], language: Language, remove_helpers: bool, cur_name: str):
+        super().__init__(language, remove_helpers)
         self.cli_command = cli_command
+        self.LLM_GENERATED_CODE_DIR.mkdir(parents=True, exist_ok=True)
+        self.LLM_GENERATED_VAL_DIR.mkdir(parents=True, exist_ok=True)
+        self.cur_name = cur_name
+
+    def _code_file(self, name: str, try_n: int) -> pathlib.Path:
+        base, extension = name.rsplit(".", 1)
+        return self.LLM_GENERATED_CODE_DIR / f"{base}_{try_n}.{extension}"
+
+    def _validation_file(self, name: str, try_n: int) -> pathlib.Path:
+        base, extension = name.rsplit(".", 1)
+        return self.LLM_GENERATED_VAL_DIR / f"{base}_{try_n}.{extension}"
 
     def add_validators(self, prg: str, inv_prg: str) -> str:
         try:
-            command = self.cli_command + [prg, inv_prg]
-            result = run(command, capture_output=True, timeout=10, check=True).stdout.decode()
+            output: pathlib.Path = self._validation_file(self.cur_name, self.tries)
+            with open(output, "w") as f:
+                f.write(prg)
+
+            code: pathlib.Path = self._code_file(self.cur_name, self.tries)
+            with open(code, "w") as f:
+                f.write(inv_prg)
+
+            self.tries += 1
+            command = self.cli_command + [str(code), str(output)]
+            result = run(command, capture_output=True, timeout=30, check=True).stdout.decode()
             return result
         except (CalledProcessError, TimeoutError):
             return inv_prg
diff --git a/verified_cogen/several_modes/args.py b/verified_cogen/several_modes/args.py
index c21d5b7..6f423ed 100644
--- a/verified_cogen/several_modes/args.py
+++ b/verified_cogen/several_modes/args.py
@@ -28,6 +28,7 @@ class ProgramArgsMultiple:
     output_logging: bool
     manual_rewriters: List[str]
     max_jobs: int
+    shell_validator: List[str]
 
     @no_type_check
     def __init__(self, args):
@@ -52,6 +53,7 @@ def __init__(self, args):
         self.modes = args.modes
         self.skip_failed = args.skip_failed
         self.max_jobs = args.max_jobs
+        self.shell_validator = args.shell_validator
 
 
 def get_default_parser_multiple():
@@ -127,6 +129,12 @@ def get_default_parser_multiple():
         default=[],
         nargs="+",
     )
+    parser.add_argument(
+        "--shell-validator",
+        help="Shell arguments to run validator",
+        default=[],
+        nargs="+",
+    )
     parser.add_argument(
         "--modes",
         help="modes",
diff --git a/verified_cogen/several_modes/several_modes.py b/verified_cogen/several_modes/several_modes.py
index 21e07d6..26b2f3d 100644
--- a/verified_cogen/several_modes/several_modes.py
+++ b/verified_cogen/several_modes/several_modes.py
@@ -11,8 +11,9 @@
 from verified_cogen.main import construct_rewriter, make_runner_cls
 from verified_cogen.runners import RunnerConfig
 from verified_cogen.runners.languages import register_basic_languages
-from verified_cogen.runners.languages.language import AnnotationType
+from verified_cogen.runners.languages.language import AnnotationType, LanguageDatabase
 from verified_cogen.runners.rewriters import Rewriter
+from verified_cogen.runners.validating import ShellValidator
 from verified_cogen.several_modes.args import ProgramArgsMultiple, get_args
 from verified_cogen.several_modes.constants import (
     MODE_MAPPING,
@@ -65,8 +66,18 @@ def process_file(
         config.args.temperature,
         history=config.history_dir / f"{file.stem}.txt",
     )
+    validator = (
+        ShellValidator(
+            config.args.shell_validator,
+            LanguageDatabase().get(file.suffix.lstrip(".")),
+            runner_config.remove_helpers,
+            file.stem + file.suffix,
+        )
+        if config.args.shell_validator
+        else None
+    )
     runner = make_runner_cls(config.args.bench_types[idx], config.extension, runner_config)(
-        llm, logger, verifier, rewriter
+        llm, logger, verifier, rewriter, validator
     )
     try:
         mode = Mode(config.args.insert_conditions_mode)