feat(anthropic): add more anthropic middleware (#33510)

Middleware Classes

Text Editor Tools
- StateClaudeTextEditorToolMiddleware: In-memory text editor using agent
state
- FilesystemClaudeTextEditorToolMiddleware: Text editor operating on
real filesystem

Implementing Claude's text editor tools

https://docs.claude.com/en/docs/agents-and-tools/tool-use/text-editor-tool
Operations: view, create, str_replace, insert

Memory Tools
- StateClaudeMemoryToolMiddleware: Memory persistence in agent state
- FilesystemClaudeMemoryToolMiddleware: Memory persistence on filesystem

Implementing Claude's memory tools
https://docs.claude.com/en/docs/agents-and-tools/tool-use/memory-tool
Operations: Same as text editor plus delete and rename

File Search Tools
- StateFileSearchMiddleware: Search state-based files

Provides Glob and Grep tools with same schema as used by Claude Code
(but compatible with any model)
- Glob: Pattern matching (e.g., **/*.py, src/**/*.ts), sorted by
modification time
- Grep: Regex content search with output modes (files_with_matches,
content, count)

Usage

``` from langchain.agents import create_agent from langchain.agents.middleware import (
StateTextEditorToolMiddleware, StateFileSearchMiddleware, )

agent = create_agent( model=model, tools=[], middleware=[
StateTextEditorToolMiddleware(), StateFileSearchMiddleware(), ], ) ```

---------

Co-authored-by: Nuno Campos <[email protected]>

Author: eyurtsev

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

@@ -1,9 +1,23 @@
 """Middleware for Anthropic models."""
 
+from langchain_anthropic.middleware.anthropic_tools import (
+    FilesystemClaudeMemoryMiddleware,
+    FilesystemClaudeTextEditorMiddleware,
+    StateClaudeMemoryMiddleware,
+    StateClaudeTextEditorMiddleware,
+)
+from langchain_anthropic.middleware.file_search import (
+    StateFileSearchMiddleware,
+)
 from langchain_anthropic.middleware.prompt_caching import (
     AnthropicPromptCachingMiddleware,
 )
 
 __all__ = [
     "AnthropicPromptCachingMiddleware",
+    "FilesystemClaudeMemoryMiddleware",
+    "FilesystemClaudeTextEditorMiddleware",
+    "StateClaudeMemoryMiddleware",
+    "StateClaudeTextEditorMiddleware",
+    "StateFileSearchMiddleware",
 ]