diff --git a/langchain/guards/restriction.py b/langchain/guards/restriction.py
index 45eb58abc37..bba4713913e 100644
--- a/langchain/guards/restriction.py
+++ b/langchain/guards/restriction.py
@@ -1,11 +1,13 @@
 """Check if chain or agent violates one or more restrictions."""
-from typing import Any, Callable, List, Tuple
+from __future__ import annotations
+
+from typing import Any, List, Tuple
 
 from langchain.chains.llm import LLMChain
 from langchain.guards.base import BaseGuard
 from langchain.guards.restriction_prompt import RESTRICTION_PROMPT
 from langchain.llms.base import BaseLLM
-from langchain.output_parsing.boolean import BooleanOutputParser
+from langchain.output_parsers.boolean import BooleanOutputParser
 from langchain.prompts.base import BasePromptTemplate
 
 
@@ -60,7 +62,7 @@ class RestrictionGuard(BaseGuard):
         llm: BaseLLM,
         prompt: BasePromptTemplate = RESTRICTION_PROMPT,
         **kwargs: Any,
-    ):
+    ) -> RestrictionGuard:
         """Load from llm and prompt."""
         guard_chain = LLMChain(llm=llm, prompt=prompt)
         return cls(guard_chain=guard_chain, **kwargs)
diff --git a/langchain/guards/string.py b/langchain/guards/string.py
index 91d8d383c95..fe4d045c838 100644
--- a/langchain/guards/string.py
+++ b/langchain/guards/string.py
@@ -38,7 +38,8 @@ class StringGuard(BaseGuard):
             called recursively if the output violates the restrictions. Defaults to 0.
 
     Raises:
-        Exception: If the output violates the restrictions and the maximum number of retries has been exceeded.
+        Exception: If the output violates the restrictions and the maximum number of
+            retries has been exceeded.
 
     Example:
         .. code-block:: python
diff --git a/langchain/output_parsers/__init__.py b/langchain/output_parsers/__init__.py
index 8509b6f2384..a5720178af7 100644
--- a/langchain/output_parsers/__init__.py
+++ b/langchain/output_parsers/__init__.py
@@ -1,4 +1,5 @@
 from langchain.output_parsers.base import BaseOutputParser
+from langchain.output_parsers.boolean import BooleanOutputParser
 from langchain.output_parsers.list import (
     CommaSeparatedListOutputParser,
     ListOutputParser,
@@ -10,4 +11,5 @@ __all__ = [
     "ListOutputParser",
     "CommaSeparatedListOutputParser",
     "BaseOutputParser",
+    "BooleanOutputParser",
 ]
diff --git a/langchain/output_parsing/boolean.py b/langchain/output_parsers/boolean.py
similarity index 97%
rename from langchain/output_parsing/boolean.py
rename to langchain/output_parsers/boolean.py
index fdfeecf8f9e..cd96ff5e84a 100644
--- a/langchain/output_parsing/boolean.py
+++ b/langchain/output_parsers/boolean.py
@@ -4,7 +4,7 @@ from typing import Dict, List
 
 from pydantic import Field, root_validator
 
-from langchain.output_parsing.base import BaseOutputParser
+from langchain.output_parsers.base import BaseOutputParser
 
 
 class BooleanOutputParser(BaseOutputParser):
diff --git a/langchain/output_parsing/__init__.py b/langchain/output_parsing/__init__.py
deleted file mode 100644
index 011ea33cfb2..00000000000
--- a/langchain/output_parsing/__init__.py
+++ /dev/null
@@ -1,6 +0,0 @@
-"""Classes to parse the output of an LLM call."""
-from langchain.output_parsing.base import BaseOutputParser
-from langchain.output_parsing.boolean import BooleanOutputParser
-from langchain.output_parsing.json import JsonOutputParser
-from langchain.output_parsing.list import ListOutputParser
-from langchain.output_parsing.regex import RegexParser
diff --git a/langchain/output_parsing/base.py b/langchain/output_parsing/base.py
deleted file mode 100644
index 37e95bf6d28..00000000000
--- a/langchain/output_parsing/base.py
+++ /dev/null
@@ -1,32 +0,0 @@
-"""Class to parse the output of an LLM call."""
-from abc import ABC, abstractmethod
-from typing import Any, Dict, List
-
-from pydantic import BaseModel
-
-
-class BaseOutputParser(BaseModel, ABC):
-    """Class to parse the output of an LLM call."""
-
-    @abstractmethod
-    def parse(self, text: str) -> Any:
-        """Parse the output of an LLM call."""
-
-    @property
-    def _type(self) -> str:
-        """Return the type key."""
-        raise NotImplementedError
-
-    def dict(self, **kwargs: Any) -> Dict:
-        """Return dictionary representation of output parser."""
-        output_parser_dict = super().dict()
-        output_parser_dict["_type"] = self._type
-        return output_parser_dict
-
-
-class ListOutputParser(BaseOutputParser):
-    """Class to parse the output of an LLM call to a list."""
-
-    @abstractmethod
-    def parse(self, text: str) -> List[str]:
-        """Parse the output of an LLM call."""
diff --git a/langchain/output_parsing/json.py b/langchain/output_parsing/json.py
deleted file mode 100644
index 19ff82f8f53..00000000000
--- a/langchain/output_parsing/json.py
+++ /dev/null
@@ -1,13 +0,0 @@
-"""Parse json output."""
-import json
-from typing import Dict, List, Union
-
-from langchain.output_parsing.base import BaseOutputParser
-
-
-class JsonOutputParser(BaseOutputParser):
-    """Parse json output."""
-
-    def parse(self, text: str) -> Union[str, List[str], Dict[str, str]]:
-        """Parse json string."""
-        return json.loads(text)
diff --git a/langchain/output_parsing/list.py b/langchain/output_parsing/list.py
deleted file mode 100644
index 1bae127704a..00000000000
--- a/langchain/output_parsing/list.py
+++ /dev/null
@@ -1,12 +0,0 @@
-"""Parse out comma separated lists."""
-from typing import List
-
-from langchain.output_parsing.base import ListOutputParser
-
-
-class CommaSeparatedListOutputParser(ListOutputParser):
-    """Parse out comma separated lists."""
-
-    def parse(self, text: str) -> List[str]:
-        """Parse the output of an LLM call."""
-        return text.strip().split(", ")
diff --git a/langchain/output_parsing/regex.py b/langchain/output_parsing/regex.py
deleted file mode 100644
index 294006c7b5e..00000000000
--- a/langchain/output_parsing/regex.py
+++ /dev/null
@@ -1,34 +0,0 @@
-"""Class to parse the output into a dictionary."""
-import re
-from typing import Dict, List, Optional
-
-from pydantic import BaseModel
-
-from langchain.output_parsing.base import BaseOutputParser
-
-
-class RegexParser(BaseOutputParser, BaseModel):
-    """Class to parse the output into a dictionary."""
-
-    regex: str
-    output_keys: List[str]
-    default_output_key: Optional[str] = None
-
-    @property
-    def _type(self) -> str:
-        """Return the type key."""
-        return "regex_parser"
-
-    def parse(self, text: str) -> Dict[str, str]:
-        """Parse the output of an LLM call."""
-        match = re.search(self.regex, text)
-        if match:
-            return {key: match.group(i + 1) for i, key in enumerate(self.output_keys)}
-        else:
-            if self.default_output_key is None:
-                raise ValueError(f"Could not parse output: {text}")
-            else:
-                return {
-                    key: text if key == self.default_output_key else ""
-                    for key in self.output_keys
-                }
diff --git a/langchain/prompts/base.py b/langchain/prompts/base.py
index 4a63b6209d3..b85f31613aa 100644
--- a/langchain/prompts/base.py
+++ b/langchain/prompts/base.py
@@ -59,6 +59,18 @@ def check_valid_template(
         )
 
 
+class StringPromptValue(PromptValue):
+    text: str
+
+    def to_string(self) -> str:
+        """Return prompt as string."""
+        return self.text
+
+    def to_messages(self) -> List[BaseMessage]:
+        """Return prompt as messages."""
+        return [HumanMessage(content=self.text)]
+
+
 class BasePromptTemplate(BaseModel, ABC):
     """Base prompt should expose the format method, returning a prompt."""
 
diff --git a/tests/unit_tests/guards/test_restriction.py b/tests/unit_tests/guards/test_restriction.py
index e802e4d8aeb..4ad3afe780d 100644
--- a/tests/unit_tests/guards/test_restriction.py
+++ b/tests/unit_tests/guards/test_restriction.py
@@ -3,6 +3,7 @@ from typing import List
 import pytest
 
 from langchain.guards.restriction import RestrictionGuard
+from langchain.guards.restriction_prompt import RESTRICTION_PROMPT
 from tests.unit_tests.llms.fake_llm import FakeLLM
 
 
@@ -19,7 +20,7 @@ def test_restriction_guard() -> None:
     ) -> str:
         concatenated_restrictions = ", ".join(restrictions)
         queries = {
-            RestrictionGuard.prompt.format(
+            RESTRICTION_PROMPT.format(
                 restrictions=concatenated_restrictions, function_output=llm_input_output
             ): "restricted because I said so :) (¥)"
             if restricted
@@ -27,7 +28,7 @@ def test_restriction_guard() -> None:
         }
         restriction_guard_llm = FakeLLM(queries=queries)
 
-        @RestrictionGuard(
+        @RestrictionGuard.from_llm(
             restrictions=restrictions, llm=restriction_guard_llm, retries=0
         )
         def example_func(prompt: str) -> str:
diff --git a/tests/unit_tests/output_parsing/test_boolean.py b/tests/unit_tests/output_parsing/test_boolean.py
index 482f4c2f058..c7b804a2ba6 100644
--- a/tests/unit_tests/output_parsing/test_boolean.py
+++ b/tests/unit_tests/output_parsing/test_boolean.py
@@ -2,7 +2,7 @@ from typing import List
 
 import pytest
 
-from langchain.output_parsing.boolean import BooleanOutputParser
+from langchain.output_parsers.boolean import BooleanOutputParser
 
 GOOD_EXAMPLES = [
     ("0", False, ["1"], ["0"]),