fix: adding missing async hooks (#33957)

* filling in missing async gaps
* using recommended tool runtime injection instead of injected state
  * updating tests to use helper function as well

libs/langchain_v1/langchain/agents/middleware/human_in_the_loop.py

@@ -353,3 +353,7 @@ class HumanInTheLoopMiddleware(AgentMiddleware):
         last_ai_msg.tool_calls = revised_tool_calls
 
         return {"messages": [last_ai_msg, *artificial_tool_messages]}
+
+    async def aafter_model(self, state: AgentState, runtime: Runtime) -> dict[str, Any] | None:
+        """Async trigger interrupt flows for relevant tool calls after an `AIMessage`."""
+        return self.after_model(state, runtime)

libs/langchain_v1/langchain/agents/middleware/model_call_limit.py

@@ -198,6 +198,29 @@ class ModelCallLimitMiddleware(AgentMiddleware[ModelCallLimitState, Any]):
 
         return None
 
+    @hook_config(can_jump_to=["end"])
+    async def abefore_model(
+        self,
+        state: ModelCallLimitState,
+        runtime: Runtime,
+    ) -> dict[str, Any] | None:
+        """Async check model call limits before making a model call.
+
+        Args:
+            state: The current agent state containing call counts.
+            runtime: The langgraph runtime.
+
+        Returns:
+            If limits are exceeded and exit_behavior is `'end'`, returns
+                a `Command` to jump to the end with a limit exceeded message. Otherwise
+                returns `None`.
+
+        Raises:
+            ModelCallLimitExceededError: If limits are exceeded and `exit_behavior`
+                is `'error'`.
+        """
+        return self.before_model(state, runtime)
+
     def after_model(self, state: ModelCallLimitState, runtime: Runtime) -> dict[str, Any] | None:  # noqa: ARG002
         """Increment model call counts after a model call.
 
@@ -212,3 +235,19 @@ class ModelCallLimitMiddleware(AgentMiddleware[ModelCallLimitState, Any]):
             "thread_model_call_count": state.get("thread_model_call_count", 0) + 1,
             "run_model_call_count": state.get("run_model_call_count", 0) + 1,
         }
+
+    async def aafter_model(
+        self,
+        state: ModelCallLimitState,
+        runtime: Runtime,
+    ) -> dict[str, Any] | None:
+        """Async increment model call counts after a model call.
+
+        Args:
+            state: The current agent state.
+            runtime: The langgraph runtime.
+
+        Returns:
+            State updates with incremented call counts.
+        """
+        return self.after_model(state, runtime)

libs/langchain_v1/langchain/agents/middleware/pii.py

@@ -252,6 +252,27 @@ class PIIMiddleware(AgentMiddleware):
 
         return None
 
+    @hook_config(can_jump_to=["end"])
+    async def abefore_model(
+        self,
+        state: AgentState,
+        runtime: Runtime,
+    ) -> dict[str, Any] | None:
+        """Async check user messages and tool results for PII before model invocation.
+
+        Args:
+            state: The current agent state.
+            runtime: The langgraph runtime.
+
+        Returns:
+            Updated state with PII handled according to strategy, or `None` if no PII
+                detected.
+
+        Raises:
+            PIIDetectionError: If PII is detected and strategy is `'block'`.
+        """
+        return self.before_model(state, runtime)
+
     def after_model(
         self,
         state: AgentState,
@@ -311,6 +332,26 @@ class PIIMiddleware(AgentMiddleware):
 
         return {"messages": new_messages}
 
+    async def aafter_model(
+        self,
+        state: AgentState,
+        runtime: Runtime,
+    ) -> dict[str, Any] | None:
+        """Async check AI messages for PII after model invocation.
+
+        Args:
+            state: The current agent state.
+            runtime: The langgraph runtime.
+
+        Returns:
+            Updated state with PII handled according to strategy, or None if no PII
+                detected.
+
+        Raises:
+            PIIDetectionError: If PII is detected and strategy is `'block'`.
+        """
+        return self.after_model(state, runtime)
+
 
 __all__ = [
     "PIIDetectionError",

libs/langchain_v1/langchain/agents/middleware/shell_tool.py

@@ -482,7 +482,7 @@ class ShellToolMiddleware(AgentMiddleware[ShellToolState, Any]):
         return {"shell_session_resources": resources}
 
     async def abefore_agent(self, state: ShellToolState, runtime: Runtime) -> dict[str, Any] | None:
-        """Async counterpart to `before_agent`."""
+        """Async start the shell session and run startup commands."""
         return self.before_agent(state, runtime)
 
     def after_agent(self, state: ShellToolState, runtime: Runtime) -> None:  # noqa: ARG002
@@ -494,7 +494,7 @@ class ShellToolMiddleware(AgentMiddleware[ShellToolState, Any]):
             resources._finalizer()
 
     async def aafter_agent(self, state: ShellToolState, runtime: Runtime) -> None:
-        """Async counterpart to `after_agent`."""
+        """Async run shutdown commands and release resources when an agent completes."""
         return self.after_agent(state, runtime)
 
     def _ensure_resources(self, state: ShellToolState) -> _SessionResources:
@@ -689,7 +689,8 @@ class ShellToolMiddleware(AgentMiddleware[ShellToolState, Any]):
         request: ToolCallRequest,
         handler: typing.Callable[[ToolCallRequest], typing.Awaitable[ToolMessage | Command]],
     ) -> ToolMessage | Command:
-        """Async interception mirroring the synchronous tool handler."""
+        """Async intercept local shell tool calls and execute them via the managed session."""
+        # The sync version already handles all the work, no need for async-specific logic
         if isinstance(request.tool, _PersistentShellTool):
             resources = self._ensure_resources(request.state)
             return self._run_shell_tool(

libs/langchain_v1/langchain/agents/middleware/tool_call_limit.py

@@ -451,3 +451,28 @@ class ToolCallLimitMiddleware(
             "run_tool_call_count": run_counts,
             "messages": artificial_messages,
         }
+
+    @hook_config(can_jump_to=["end"])
+    async def aafter_model(
+        self,
+        state: ToolCallLimitState[ResponseT],
+        runtime: Runtime[ContextT],
+    ) -> dict[str, Any] | None:
+        """Async increment tool call counts after a model call and check limits.
+
+        Args:
+            state: The current agent state.
+            runtime: The langgraph runtime.
+
+        Returns:
+            State updates with incremented tool call counts. If limits are exceeded
+                and exit_behavior is `'end'`, also includes a jump to end with a
+                `ToolMessage` and AI message for the single exceeded tool call.
+
+        Raises:
+            ToolCallLimitExceededError: If limits are exceeded and `exit_behavior`
+                is `'error'`.
+            NotImplementedError: If limits are exceeded, `exit_behavior` is `'end'`,
+                and there are multiple tool calls.
+        """
+        return self.after_model(state, runtime)

libs/partners/anthropic/langchain_anthropic/middleware/bash.py

@@ -40,6 +40,18 @@ class ClaudeBashToolMiddleware(ShellToolMiddleware):
             request = request.override(tools=tools)
         return handler(request)
 
+    async def awrap_model_call(
+        self,
+        request: ModelRequest,
+        handler: Callable[[ModelRequest], Awaitable[ModelResponse]],
+    ) -> ModelResponse:
+        """Async: ensure the Claude bash descriptor is available to the model."""
+        tools = request.tools
+        if all(tool is not _CLAUDE_BASH_DESCRIPTOR for tool in tools):
+            tools = [*tools, _CLAUDE_BASH_DESCRIPTOR]
+            request = request.override(tools=tools)
+        return await handler(request)
+
     def wrap_tool_call(
         self,
         request: ToolCallRequest,

libs/partners/anthropic/langchain_anthropic/middleware/file_search.py

@@ -9,13 +9,13 @@ from __future__ import annotations
 import fnmatch
 import re
 from pathlib import Path, PurePosixPath
-from typing import TYPE_CHECKING, Annotated, Literal, cast
+from typing import TYPE_CHECKING, Literal, cast
 
 if TYPE_CHECKING:
     from typing import Any
 
 from langchain.agents.middleware.types import AgentMiddleware
-from langchain_core.tools import InjectedToolArg, tool
+from langchain.tools import ToolRuntime, tool
 
 from langchain_anthropic.middleware.anthropic_tools import AnthropicToolsState
 
@@ -128,9 +128,9 @@ class StateFileSearchMiddleware(AgentMiddleware):
         # Create tool instances
         @tool
         def glob_search(  # noqa: D417
+            runtime: ToolRuntime[None, AnthropicToolsState],
             pattern: str,
             path: str = "/",
-            state: Annotated[AnthropicToolsState, InjectedToolArg] = None,  # type: ignore[assignment]
         ) -> str:
             """Fast file pattern matching tool that works with any codebase size.
 
@@ -147,56 +147,17 @@ class StateFileSearchMiddleware(AgentMiddleware):
                 time (most recently modified first). Returns "No files found" if no
                 matches.
             """
-            # Normalize base path
+            return self._handle_glob_search(pattern, path, runtime.state)
-            base_path = path if path.startswith("/") else "/" + path
-
-            # Get files from state
-            files = cast("dict[str, Any]", state.get(self.state_key, {}))
-
-            # Match files
-            matches = []
-            for file_path, file_data in files.items():
-                if file_path.startswith(base_path):
-                    # Get relative path from base
-                    if base_path == "/":
-                        relative = file_path[1:]  # Remove leading /
-                    elif file_path == base_path:
-                        relative = Path(file_path).name
-                    elif file_path.startswith(base_path + "/"):
-                        relative = file_path[len(base_path) + 1 :]
-                    else:
-                        continue
-
-                    # Match against pattern
-                    # Handle ** pattern which requires special care
-                    # PurePosixPath.match doesn't match single-level paths
-                    # against **/pattern
-                    is_match = PurePosixPath(relative).match(pattern)
-                    if not is_match and pattern.startswith("**/"):
-                        # Also try matching without the **/ prefix for files in base dir
-                        is_match = PurePosixPath(relative).match(pattern[3:])
-
-                    if is_match:
-                        matches.append((file_path, file_data["modified_at"]))
-
-            if not matches:
-                return "No files found"
-
-            # Sort by modification time
-            matches.sort(key=lambda x: x[1], reverse=True)
-            file_paths = [path for path, _ in matches]
-
-            return "\n".join(file_paths)
 
         @tool
         def grep_search(  # noqa: D417
+            runtime: ToolRuntime[None, AnthropicToolsState],
             pattern: str,
             path: str = "/",
             include: str | None = None,
             output_mode: Literal[
                 "files_with_matches", "content", "count"
             ] = "files_with_matches",
-            state: Annotated[AnthropicToolsState, InjectedToolArg] = None,  # type: ignore[assignment]
         ) -> str:
             """Fast content search tool that works with any codebase size.
 
@@ -216,49 +177,133 @@ class StateFileSearchMiddleware(AgentMiddleware):
                 Search results formatted according to output_mode. Returns "No matches
                 found" if no results.
             """
-            # Normalize base path
+            return self._handle_grep_search(
-            base_path = path if path.startswith("/") else "/" + path
+                pattern, path, include, output_mode, runtime.state
-
+            )
-            # Compile regex pattern (for validation)
-            try:
-                regex = re.compile(pattern)
-            except re.error as e:
-                return f"Invalid regex pattern: {e}"
-
-            if include and not _is_valid_include_pattern(include):
-                return "Invalid include pattern"
-
-            # Search files
-            files = cast("dict[str, Any]", state.get(self.state_key, {}))
-            results: dict[str, list[tuple[int, str]]] = {}
-
-            for file_path, file_data in files.items():
-                if not file_path.startswith(base_path):
-                    continue
-
-                # Check include filter
-                if include:
-                    basename = Path(file_path).name
-                    if not _match_include_pattern(basename, include):
-                        continue
-
-                # Search file content
-                for line_num, line in enumerate(file_data["content"], 1):
-                    if regex.search(line):
-                        if file_path not in results:
-                            results[file_path] = []
-                        results[file_path].append((line_num, line))
-
-            if not results:
-                return "No matches found"
-
-            # Format output based on mode
-            return self._format_grep_results(results, output_mode)
 
         self.glob_search = glob_search
         self.grep_search = grep_search
         self.tools = [glob_search, grep_search]
 
+    def _handle_glob_search(
+        self,
+        pattern: str,
+        path: str,
+        state: AnthropicToolsState,
+    ) -> str:
+        """Handle glob search operation.
+
+        Args:
+            pattern: The glob pattern to match files against.
+            path: The directory to search in.
+            state: The current agent state.
+
+        Returns:
+            Newline-separated list of matching file paths, sorted by modification
+            time (most recently modified first). Returns "No files found" if no
+            matches.
+        """
+        # Normalize base path
+        base_path = path if path.startswith("/") else "/" + path
+
+        # Get files from state
+        files = cast("dict[str, Any]", state.get(self.state_key, {}))
+
+        # Match files
+        matches = []
+        for file_path, file_data in files.items():
+            if file_path.startswith(base_path):
+                # Get relative path from base
+                if base_path == "/":
+                    relative = file_path[1:]  # Remove leading /
+                elif file_path == base_path:
+                    relative = Path(file_path).name
+                elif file_path.startswith(base_path + "/"):
+                    relative = file_path[len(base_path) + 1 :]
+                else:
+                    continue
+
+                # Match against pattern
+                # Handle ** pattern which requires special care
+                # PurePosixPath.match doesn't match single-level paths
+                # against **/pattern
+                is_match = PurePosixPath(relative).match(pattern)
+                if not is_match and pattern.startswith("**/"):
+                    # Also try matching without the **/ prefix for files in base dir
+                    is_match = PurePosixPath(relative).match(pattern[3:])
+
+                if is_match:
+                    matches.append((file_path, file_data["modified_at"]))
+
+        if not matches:
+            return "No files found"
+
+        # Sort by modification time
+        matches.sort(key=lambda x: x[1], reverse=True)
+        file_paths = [path for path, _ in matches]
+
+        return "\n".join(file_paths)
+
+    def _handle_grep_search(
+        self,
+        pattern: str,
+        path: str,
+        include: str | None,
+        output_mode: str,
+        state: AnthropicToolsState,
+    ) -> str:
+        """Handle grep search operation.
+
+        Args:
+            pattern: The regular expression pattern to search for in file contents.
+            path: The directory to search in.
+            include: File pattern to filter (e.g., "*.js", "*.{ts,tsx}").
+            output_mode: Output format.
+            state: The current agent state.
+
+        Returns:
+            Search results formatted according to output_mode. Returns "No matches
+            found" if no results.
+        """
+        # Normalize base path
+        base_path = path if path.startswith("/") else "/" + path
+
+        # Compile regex pattern (for validation)
+        try:
+            regex = re.compile(pattern)
+        except re.error as e:
+            return f"Invalid regex pattern: {e}"
+
+        if include and not _is_valid_include_pattern(include):
+            return "Invalid include pattern"
+
+        # Search files
+        files = cast("dict[str, Any]", state.get(self.state_key, {}))
+        results: dict[str, list[tuple[int, str]]] = {}
+
+        for file_path, file_data in files.items():
+            if not file_path.startswith(base_path):
+                continue
+
+            # Check include filter
+            if include:
+                basename = Path(file_path).name
+                if not _match_include_pattern(basename, include):
+                    continue
+
+            # Search file content
+            for line_num, line in enumerate(file_data["content"], 1):
+                if regex.search(line):
+                    if file_path not in results:
+                        results[file_path] = []
+                    results[file_path].append((line_num, line))
+
+        if not results:
+            return "No matches found"
+
+        # Format output based on mode
+        return self._format_grep_results(results, output_mode)
+
     def _format_grep_results(
         self,
         results: dict[str, list[tuple[int, str]]],

libs/partners/anthropic/tests/unit_tests/middleware/test_file_search.py

@@ -49,8 +49,10 @@ class TestGlobSearch:
             },
         }
 
-        # Call tool function directly (state is injected in real usage)
+        # Call internal handler method directly
-        result = middleware.glob_search.func(pattern="*.py", state=test_state)  # type: ignore[attr-defined]
+        result = middleware._handle_glob_search(
+            pattern="*.py", path="/", state=test_state
+        )
 
         assert isinstance(result, str)
         assert "/src/main.py" in result
@@ -82,7 +84,9 @@ class TestGlobSearch:
             },
         }
 
-        result = middleware.glob_search.func(pattern="**/*.py", state=state)  # type: ignore[attr-defined]
+        result = middleware._handle_glob_search(
+            pattern="**/*.py", path="/", state=state
+        )
 
         assert isinstance(result, str)
         lines = result.split("\n")
@@ -109,7 +113,7 @@ class TestGlobSearch:
             },
         }
 
-        result = middleware.glob_search.func(  # type: ignore[attr-defined]
+        result = middleware._handle_glob_search(
             pattern="**/*.py", path="/src", state=state
         )
 
@@ -132,7 +136,7 @@ class TestGlobSearch:
             },
         }
 
-        result = middleware.glob_search.func(pattern="*.ts", state=state)  # type: ignore[attr-defined]
+        result = middleware._handle_glob_search(pattern="*.ts", path="/", state=state)
 
         assert isinstance(result, str)
         assert result == "No files found"
@@ -157,7 +161,7 @@ class TestGlobSearch:
             },
         }
 
-        result = middleware.glob_search.func(pattern="*.py", state=state)  # type: ignore[attr-defined]
+        result = middleware._handle_glob_search(pattern="*.py", path="/", state=state)
 
         lines = result.split("\n")
         # Most recent first
@@ -193,7 +197,13 @@ class TestGrepSearch:
             },
         }
 
-        result = middleware.grep_search.func(pattern=r"def \w+\(\):", state=state)  # type: ignore[attr-defined]
+        result = middleware._handle_grep_search(
+            pattern=r"def \w+\(\):",
+            path="/",
+            include=None,
+            output_mode="files_with_matches",
+            state=state,
+        )
 
         assert isinstance(result, str)
         assert "/src/main.py" in result
@@ -216,8 +226,12 @@ class TestGrepSearch:
             },
         }
 
-        result = middleware.grep_search.func(  # type: ignore[attr-defined]
+        result = middleware._handle_grep_search(
-            pattern=r"def", include="*.{py", state=state
+            pattern=r"def",
+            path="/",
+            include="*.{py",
+            output_mode="files_with_matches",
+            state=state,
         )
 
         assert result == "Invalid include pattern"
@@ -241,8 +255,12 @@ class TestFilesystemGrepSearch:
             },
         }
 
-        result = middleware.grep_search.func(  # type: ignore[attr-defined]
+        result = middleware._handle_grep_search(
-            pattern=r"def \w+\(\):", output_mode="content", state=state
+            pattern=r"def \w+\(\):",
+            path="/",
+            include=None,
+            output_mode="content",
+            state=state,
         )
 
         assert isinstance(result, str)
@@ -271,8 +289,8 @@ class TestFilesystemGrepSearch:
             },
         }
 
-        result = middleware.grep_search.func(  # type: ignore[attr-defined]
+        result = middleware._handle_grep_search(
-            pattern=r"TODO", output_mode="count", state=state
+            pattern=r"TODO", path="/", include=None, output_mode="count", state=state
         )
 
         assert isinstance(result, str)
@@ -300,8 +318,12 @@ class TestFilesystemGrepSearch:
             },
         }
 
-        result = middleware.grep_search.func(  # type: ignore[attr-defined]
+        result = middleware._handle_grep_search(
-            pattern="import", include="*.py", state=state
+            pattern="import",
+            path="/",
+            include="*.py",
+            output_mode="files_with_matches",
+            state=state,
         )
 
         assert isinstance(result, str)
@@ -333,8 +355,12 @@ class TestFilesystemGrepSearch:
             },
         }
 
-        result = middleware.grep_search.func(  # type: ignore[attr-defined]
+        result = middleware._handle_grep_search(
-            pattern="const", include="*.{ts,tsx}", state=state
+            pattern="const",
+            path="/",
+            include="*.{ts,tsx}",
+            output_mode="files_with_matches",
+            state=state,
         )
 
         assert isinstance(result, str)
@@ -362,7 +388,13 @@ class TestFilesystemGrepSearch:
             },
         }
 
-        result = middleware.grep_search.func(pattern="import", path="/src", state=state)  # type: ignore[attr-defined]
+        result = middleware._handle_grep_search(
+            pattern="import",
+            path="/src",
+            include=None,
+            output_mode="files_with_matches",
+            state=state,
+        )
 
         assert isinstance(result, str)
         assert "/src/main.py" in result
@@ -383,7 +415,13 @@ class TestFilesystemGrepSearch:
             },
         }
 
-        result = middleware.grep_search.func(pattern=r"TODO", state=state)  # type: ignore[attr-defined]
+        result = middleware._handle_grep_search(
+            pattern=r"TODO",
+            path="/",
+            include=None,
+            output_mode="files_with_matches",
+            state=state,
+        )
 
         assert isinstance(result, str)
         assert result == "No matches found"
@@ -397,7 +435,13 @@ class TestFilesystemGrepSearch:
             "text_editor_files": {},
         }
 
-        result = middleware.grep_search.func(pattern=r"[unclosed", state=state)  # type: ignore[attr-defined]
+        result = middleware._handle_grep_search(
+            pattern=r"[unclosed",
+            path="/",
+            include=None,
+            output_mode="files_with_matches",
+            state=state,
+        )
 
         assert isinstance(result, str)
         assert "Invalid regex pattern" in result
@@ -428,7 +472,7 @@ class TestSearchWithDifferentBackends:
             },
         }
 
-        result = middleware.glob_search.func(pattern="**/*", state=state)  # type: ignore[attr-defined]
+        result = middleware._handle_glob_search(pattern="**/*", path="/", state=state)
 
         assert isinstance(result, str)
         assert "/src/main.py" in result
@@ -457,7 +501,13 @@ class TestSearchWithDifferentBackends:
             },
         }
 
-        result = middleware.grep_search.func(pattern=r"TODO", state=state)  # type: ignore[attr-defined]
+        result = middleware._handle_grep_search(
+            pattern=r"TODO",
+            path="/",
+            include=None,
+            output_mode="files_with_matches",
+            state=state,
+        )
 
         assert isinstance(result, str)
         assert "/src/main.py" in result
@@ -486,7 +536,13 @@ class TestSearchWithDifferentBackends:
             },
         }
 
-        result = middleware.grep_search.func(pattern=r".*", state=state)  # type: ignore[attr-defined]
+        result = middleware._handle_grep_search(
+            pattern=r".*",
+            path="/",
+            include=None,
+            output_mode="files_with_matches",
+            state=state,
+        )
 
         assert isinstance(result, str)
         assert "/src/main.py" in result