版本更新：langchain-ai/langchain 1.3.0a1，提升开发者接入体验

Initial release release(langchain): 1.3.0a1 ( #37140 ) feat(langchain): wire stream_events(version='v3') into create_agent ( #37136 ) Merge remote-tracking branch 'origin/master' into v1.4 feat(core): stream_events(version='v3') protocol ( #37111 ) release(fireworks): 1.2.1 ( #37113 ) release(langchain): 1.2.17 ( #37110 ) feat(langchain): add respond decision to HITL middleware ( #37095 ) release(langchain): 1.2.16 ( #37085 ) chore(docs): update x handle references ( #37081 ) release(anthropic): 1.4.2 ( #37061 ) perf(langchain): stop inlining agent state into tool-dispatch Send s ( #36960 ) docs(langchain): correct import paths in agent middleware docstrings ( #36987 ) hotfix: bump min core versions ( #36996 ) release(openai): 1.2.1 ( #36995 ) feat(core): add content-block-centric streaming (v2) ( #36834 ) fix(fireworks): honor max_retries ( #36973 ) release(openai): 1.2.0 ( #36961 ) docs(langchain): correct import path in ModelCallLimitMiddleware docstring ( #36895 ) feat(langchain): ls_agent_type tag on create_agent calls ( #36774 ) release(core): release 1.3.0 ( #36851 ) chore: bump langsmith from 0.6.3 to 0.7.31 in /libs/langchain_v1 ( #36800 ) chore(deps): bump pytest to 9.0.3 ( #36801 ) chore: bump pytest from 9.0.2 to 9.0.3 in /libs/langchain_v1 ( #36717 ) chore: bump pillow from 12.1.1 to 12.2.0 in /libs/langchain_v1 ( #36710 ) test(langchain): test cache hit/miss on lru ( #36659 ) perf(langchain): add lru cache when resolving types ( #36649 ) perf(langchain): add another init test with middleware ( #36644 ) chore(core): reduce streaming metadata / perf ( #36588 ) perf(langchain): add benchmark command ( #36641 ) chore: bump cryptography from 46.0.6 to 46.0.7 in /libs/langchain_v1 ( #36619 ) docs(langchain): add missing baseten and litellm to init_chat_model ( #36562 ) release(core): 1.2.26 ( #36511 ) release: langchain v1.2.15 ( #36496 ) chore: bump aiohttp from 3.13.3 to 3.13.4 in /libs/langchain_v1 ( #36438 ) release(langchain): 1.2.14 ( #36396 ) chore: pygments>=2.20.0 across all packages ( CVE-2026-4539 ) ( #36385 ) test(langchain): cover runtime recursion limit override in create_agent ( #36376 ) perf(langchain): reduce init speed by 15% ( #36375 ) fix(langchain): update recursion limit for create_agent ( #36351 ) fix(infra): correct lint_diff relative paths in package makefiles ( #36333 ) chore: bump cryptography from 46.0.5 to 46.0.6 in /libs/langchain_v1 ( #36324 ) fix(langchain): recognize ChatAnthropicVertex in _get_approximate_token_counter ( #36320 ) chore(langchain): remove unnecessary description for toods list as a group ( #36315 ) chore(langchain): add async implementation to todolist and test ( #36313 ) chore(langchain): speed up todo list middleware init ( #36311 ) chore: bump requests from 2.32.5 to 2.33.0 in /libs/langchain_v1 ( #36241 ) chore(partners): bump langchain-core min to 1.2.21 ( #36183 ) fix(core,model-profiles): add missing ModelProfile fields, warn on schema drift ( #36129 ) fix(langchain,langchain-classic): update model provider classes for Azure AI Foundry ( #35812 ) release(langchain): 1.2.13 ( #36111 ) ci: suppress pytest streaming output in CI ( #36092 ) feat: Add LangSmith integration metadata to create_agent and init_chat_model ( #35810 ) ci: avoid unnecessary dep installs in lint targets ( #36046 ) chore: bump pyasn1 from 0.6.2 to 0.6.3 in /libs/langchain_v1 ( #36029 ) chore: bump pyjwt from 2.10.1 to 2.12.0 in /libs/langchain_v1 ( #36024 ) fix(langchain): export Runtime from agents.middleware ( #35975 ) chore: bump locks, lint ( #35985 ) fix(openai): add type: message to Responses API input items ( #35693 ) chore: bump black from 25.11.0 to 26.3.1 in /libs/langchain_v1 ( #35802 ) chore: bump orjson from 3.11.5 to 3.11.6 in /libs/langchain_v1 ( #35807 ) chore(langchain): add baseten to _BUILTIN_PROVIDERS ( #35777 ) release(langchain_v1): 1.2.12 ( #35770 ) feat: tracing for wrap model + tool call ( #35765 ) release(langchain_v1): 1.2.11 ( #35723 ) fix(langchain): normalize custom detector output to prevent KeyError in hash/mask strategies ( #35651 ) chore: bump the minor-and-patch group across 3 directories with 7 updates ( #35605 ) chore(langchain): switch refs from gemini-3 to gemini-3.1 ( #35535 ) chore: bump the langchain-deps group across 3 directories with 7 updates ( #35513 ) chore: bump langgraph-checkpoint from 3.0.1 to 4.0.0 in /libs/langchain_v1 ( #35445 ) chore: bump the langchain-deps group across 3 directories with 14 updates ( #35441 ) chore: bump google-cloud-aiplatform from 1.127.0 to 1.133.0 in /libs/langchain_v1 ( #35397 ) revert: add ChatAnthropicBedrockWrapper ( #35371 ) fix(langchain): support anthropic-bedrock in init_chat_model ( #35366 ) style: fix some ruff noqa ( #35321 ) fix(langchain): allow Gemini 3 models to use ProviderStrategy with tools ( #34464 ) docs: fix docstring inaccuracies and update outdated LangSmith URLs ( #35283 ) feat(openai): support automatic server-side compaction ( #35212 ) chore: bump the langchain-deps group across 3 directories with 8 updates ( #35257 ) feat(openrouter): add langchain-openrouter provider package ( #35211 ) style: bump ruff version to 0.15 ( #35042 ) chore(deps): bump pillow from 12.0.0 to 12.1.1 in /libs/langchain_v1 ( #35174 ) chore(core): raise more descriptive model error in init_chat_model ( #35167 ) chore(deps): bump langsmith from 0.4.42 to 0.6.3 in /libs/langchain_v1 ( #35149 ) chore(deps): bump cryptography from 46.0.3 to 46.0.5 in /libs/langchain_v1 ( #35148 ) release(langchain): 1.2.10 ( #35137 ) chore(deps): bump the langchain-deps group across 3 directories with 40 updates ( #35129 ) chore(deps): bump the langchain-deps group across 3 directories with 11 updates ( #35121 ) fix(langchain): fix token counting on partial message sequences ( #35101 ) refactor(langchain): rename _SUPPORTED_PROVIDERS -> _BUILTIN_PROVIDERS ( #35100 ) fix(langchain): normalize raw schemas in middleware response_format override ( #35019 ) feat: support state updates from wrap_model_call with command(s) ( #35033 ) test(langchain): types in test_tool_call_limit and test_model_retry ( #34629 ) fix(langchain): bump min core version and improve approximate token counting ( #35026 ) release: langchain 1.2.9 ( #35023 ) feat: threading context through create_agent flows + middleware ( #34978 ) chore: add make type target ( #35015 ) revert: "chore: add typing target in Makefile " ( #35013 ) chore: add typing target in Makefile ( #35012 ) revert: use usage metadata scaling in SummarizationMiddleware default token counter ( #35002 ) fix(langchain): use usage metadata scaling in SummarizationMiddleware default token counter ( #35001 ) fix(langchain): avoid UnboundLocalError when no AIMessage exists ( #34816 ) chore: enrich pyproject.toml files ( #34980 ) release(langchain): 1.2.8 ( #34976 ) chore(deps): bump the uv group across 20 directories with 3 updates ( #34941 ) fix: reuse ToolStrategy in agent factory to prevent name mismatch ( #34871 ) chore: upgrade urllib3 to 2.6.3 ( #34940 ) feat(langchain): add ToolCallRequest to middleware exports ( #34894 ) style(langchain): lint ( #34863 ) fix(langchain): blocking unit test ( #34866 ) test(langchain): use blockbuster to detect blocking calls in the async event loop ( #34777 ) release: langchain 1.2.7 ( #34854 ) feat: dynamic tool registration via middleware ( #34842 ) fix(langchain): strip trailing whitespace from the summarization prompt ( #34835 ) fix(langchain): improve grammar in SummarizationMiddleware system prompt ( #34834 ) docs(langchain): nit ( #34788 ) chore(deps): bump the uv group across 5 directories with 5 updates ( #34785 ) chore(deps): bump the uv group across 8 directories with 6 updates ( #34773 ) chore(core, langchain): add version consistency check pre-commit hooks ( #34782 ) release(langchain): 1.2.6 ( #34781 ) fix(langchain): SummarizationMiddleware signature mismatch & config invocation ( #34775 ) release(langchain): 1.2.5 ( #34772 ) fix(langchain): add metadata configuration to summarization model invocation ( #34763 ) feat(langchain): update summarization prompt ( #34754 ) chore: add tests for agent name metadata when streaming ( #34764 ) Revert "metadata" metadata release: langchain 1.2.4 ( #34755 ) chore(langchain): add agent name metadata ( #34743 ) chore: update twitter URLs ( #34736 ) chore: add tests for private state attr use (really, lack thereof) ( #34725 ) docs(langchain): clarify model ID usage for reliable behavior ( #34718 ) fix(langchain): tag messages generated from summarization ( #34693 ) fix(langchain): activate test_return_direct_spec tests, fix types ( #34565 ) chore(langchain): fix types in test_todo , test_tool_retry ( #34503 ) chore(langchain): fix types in test_shell_tool ( #34502 ) chore(langchain): activate mypy warn_return_any rule ( #34549 ) chore(langchain): fix types in test_tool_selection and test_tool_emulator ( #34499 ) chore(langchain): fix types in test_shell_execution_policies ( #34498 ) chore(langchain): improve ignore_missing_imports config ( #34551 ) test(langchain): complete and activate test_responses tests ( #34560 ) fix(langchain): activate mypy warn-unreachable ( #34553 ) chore(langchain): fix types in test_injected_runtime_create_agent , test_create_agent_tool_validation ( #34568 ) chore(langchain): fix types in test_response_format and test_state_schema ( #34571 ) chore(langchain): remove generic from FakeToolCallingModel ( #34572 ) chore(langchain): fix types in test_context_editing , test_agent_name , test_response_format_integration ( #34574 ) chore(langchain): fix types in test_overrides ( #34635 ) feat(langchain): add state to _ModelRequestOverrides ( #34692 ) chore(langchain): fix types in test_tools ( #34592 ) chore(langchain): fix types in test_summarization ( #34656 ) test(langchain): activate test_responses_spec tests ( #34564 ) style(langchain): fix some ruff preview rules ( #34663 ) chore(langchain): fix types in test_framework ( #34567 ) chore(langchain): fix types in memory_assert , conftest , conftest_checkpointer and conftest_store ( #34636 ) chore(langchain): fix types in test_system_message ( #34634 ) style: bump ruff version to 0.14.11 ( #34674 ) fix: remove relative imports ( #34680 ) fix(langchain,langchain-classic): more descriptive error msg when dep is not installed ( #34679 ) fix(langchain): infer provider from mixed-case prefixes ( #34672 ) fix: add test confirming we don't inject args based on args_schema alone ( #34677 ) release(langchain): 1.2.3 ( #34668 ) refactor(langchain): engage summarization based on reported usage_metadata ( #34632 ) fix(langchain): keep tool call / AIMessage pairings when summarizing ( #34609 ) test(langchain): cover chat model provider inference ( #34657 ) fix(langchain): fix copy-paste error on azure_openai embedding provider map ( #34655 ) fix(langchain): add test to verify version ( #34644 ) release(langchain): release 1.2.2 ( #34643 ) fix(langchain): handle parallel usage of the todo tool in planning middleware ( #34637 ) chore(langchain): fix types in test_wrap_model_call ( #34573 ) release(langchain): 1.2.1 ( #34622 ) fix(core,langchain): use get_buffer_string for message summarization ( #34607 ) chore(langchain): fix types in test_model_fallback ( #34615 ) chore(langchain): fix types in test_pii ( #34617 ) chore(langchain): add admonition around redaction_rules ( #34618 ) chore(langchain): fix types in test_composition ( #34580 ) chore(langchain): fix types in test_decorators ( #34583 ) chore(langchain): fix types in test_wrap_tool_call ( #34600 ) chore(langchain): fix types in test_model_call_limit_types ( #34601 ) chore(langchain): fix types in test_file_search and test_human_in_the_loop ( #34602 ) fix(core): exclude injected args from tool schema ( #34582 ) chore(langchain): fix types in test_diagram and test_sync_async_wrappers ( #34591 ) style(langchain): add ruff rule PLC0415 ( #34559 ) fix(langchain): resolve race condition in ShellSession.execute() ( #34535 ) fix(infra): use langchain_v1 for dev container deps ( #34534 ) chore(deps): bump mypy to v1.19 and ruff to v1.14 ( #34521 ) fix(langchain-classic): pass default to config.getoption ( #34034 ) style(langchain): add ruff rule RUF012 ( #34497 ) refactor(langchain): refactor optional imports logic ( #32813 ) style: add ruff ISC001 rule ( #34493 ) style(langchain): add TC ruff rules ( #34496 ) style(langchain): fix some ruff preview rules ( #34504 ) style(langchain): fix some PLC0415 rules ( #34475 ) style(langchain): add ruff rules PT ( #34434 ) feat(langchain): enhance init_chat_model with improved validation ( #34226 ) docs(langchain): Docstring improved to show Streaming custom events ( #34353 ) feat(langchain): Add support to google_genai provider in init_embeddings ( #34388 ) release(core): 1.2.3 ( #34421 ) release(openai): 1.1.6: update max input tokens for gpt-5 series ( #34419 ) release(openai): 1.1.5 ( #34409 ) feat(infra): add CI check for out of date lockfiles ( #34397 ) release(langchain): 1.2 ( #34373 ) fix(langchain): shell output multithreading race condition ( #34333 ) refactor(standard-tests): improve VCR config ( #33968 ) fix(huggingface): Helper logic for init_chat_model with HuggingFace backend ( #34259 ) chore(langchain): cleanup ruff config ( #32810 ) fix: little lint thing ( #34310 ) chore(langchain): check agents integration tests with mypy ( #34308 ) fix(langchain): add sentinel value to ProviderStrategy / strict ( #34290 ) chore(langchain): add end to end test for strict mode in provider strategy ( #34289 ) feat(langchain,openai): add strict flag to ProviderStrategy structured output ( #34149 ) feat(core,anthropic): extras on BaseTool ( #34120 ) release(langchain): 1.1.3 ( #34255 ) feat: add agent name to AIMessage ( #34254 ) chore(core): improve typing of messages utils functions ( #34225 ) feat(anthropic): add effort support ( #34116 ) feat(langchain): add support for Upstage (Solar) in init_chat_model ( #34220 ) release: langchain 1.1.2 ( #34210 ) fix: simplify summarization cutoff logic ( #34195 ) release: langchain 1.1.1 ( #34206 ) feat: Use uuid7 for run ids ( #34172 ) fix(langchain): (SummarizationMiddleware) adjust token counts based on model ( #34161 ) docs(langchain): docstrings for summariziation middleware types ( #34158 ) fix(langchain): add types to human_in_the_loop middleware ( #34137 ) docs(anthropic,core,langchain): updates ( #34106 ) release(langchain): 1.1 ( #34090 ) feat(langchain): support SystemMessage in create_agent 's system_prompt ( #34055 ) fix: don't reorder tool calls in HITL middleware ( #34023 ) chore(docs): fix a few refs syntax errors ( #34044 ) feat(model-profiles): distribute data across packages ( #34024 ) chore: add more robust test for runtime injection w/ explicit args_schema ( #34051 ) feat: ModelRetryMiddleware ( #34027 ) fix: deprecate setattr on ModelCallRequest ( #34022 ) style(langchain): fix some middleware ref syntax ( #33988 ) fix: resumable shell, works w/ interrupts ( #33978 ) feat(langchain): reference model profiles for provider strategy ( #33974 ) chore: increase coverage for shell, filesystem, and summarization middleware ( #33928 ) fix(anthropic): execute bash + file tools via tool node ( #33960 ) fix: adding missing async hooks ( #33957 ) docs: Fix doc links ( #33964 ) fix: add filesystem middleware in init ( #33955 ) chore(langchain): update deps ( #33951 ) fix(langchain, openai): backward compat for response_format ( #33945 ) fix(langchain, openai): fix create_agent / response_format for Responses API ( #33939 ) feat: refactor tests coverage ( #33927 ) chore: update README.md files ( #33919 ) feat(langchain): support async summarization in SummarizationMiddleware ( #33918 ) feat(langchain): (SummarizationMiddleware) support use of model context windows when triggering summarization ( #33825 ) chore(langchain): pass on reference docstrings (middleware) ( #33904 ) release(langchain): 1.0.5 ( #33893 ) revert: Support for SystemMessage in create_agent ( #33889 ) fix: bump up default recursion limit ( #33881 ) chore(langchain): Support for SystemMessage in create_agent ( #33640 ) fix(langchain): Update langchain-core dependency version ( #33775 ) style: some cleanup ( #33857 ) chore: attribute package change versions ( #33854 ) fix: don't trace conditional edges and no todos in input state ( #33842 ) release: langchain v1.0.4 ( #33839 ) fix: only increment thread count on successful executions ( #33837 ) fix: more robust tool call limit middleware ( #33817 ) feat(langchain): add model-profiles as optional dependency ( #33794 ) chore: use model IDs, latest anthropic models ( #33747 ) fix(langchain): use system_prompt in integration tests ( #33748 ) chore: remove mentions of sonnet 3.5 ( #33737 ) fix(langchain_v1): remove thread_model_call_count and run_model_call_count from tool node test ( #33725 ) release: core 1.0.2 and langchain 1.0.3 ( #33736 ) fix(langchain_v1): removed unsed functions in tool_call_limit middleware ( #33735 ) style: more refs fixes ( #33730 ) chore: move ToolNode improvements back to langgraph ( #33634 ) feat: support structured output retry middleware ( #33663 ) fix(langchain_v1): correct ref url ( #33715 ) style: more refs work ( #33707 ) feat(langchain): export UsageMetadata ( #33692 ) release(core): 1.0.1 ( #33639 ) chore(langchain_v1): bump version from 1.0.1 to 1.0.2 ( #33629 ) fix(langchain_v1): remove non llm controllable params from tool message on invocation failure ( #33625 ) release(langchain_v1): 1.0.1 ( #33610 ) fix(langchain_v1): ToolRuntime default for args ( #33606 ) style: more refs polishing ( #33601 ) docs(langchain): update reference documentation to note moved embeddings modules ( #33600 ) style(anthropic): use aliases for model names ( #33590 ) chore: update pyproject.toml url entries ( #33587 ) release(langchain_v1): v1.0.0 ( #33588 ) fix: shell tool middleware ( #33589 ) feat(langchain_v1): Python 3.14 support ( #33560 ) fix(langchain,langchain_v1): enable huggingface optional dep ( #33586 ) fix(langchain): conditional tools -> end edge when all client side calls return direct ( #33550 ) chore(langchain_v1): relax typing on input state ( #33552 ) feat(langchain_v1): Add ShellToolMiddleware and ClaudeBashToolMiddleware ( #33527 ) feat(langchain): file-search middleware ( #33551 ) release: joint rcs for core + langchain ( #33549 ) chore(langchain): allow injection of ToolRuntime and generic ToolRuntime[ContextT, StateT] ( #33546 ) fix(langchain): revert conditional edge from tools to end ( #33520 ) ( #33539 ) release(langchain): cut rc ( #33534 ) release(core): 1.0.0rc2 ( #33530 ) docs(langchain_v1): remove absent arg descriptions ( #33529 ) fix(langchain): conditional edge from tools to end ( #33520 ) fix(langchain_v1): relax tool node validation to allow claude text editing tools ( #33512 ) chore(langchain): update state schema doc ( #33524 ) chore(langchain_v1): adding back state_schema to create_agent ( #33519 ) chore(langchain): use runtime not tool_runtime for injected tool arg ( #33522 ) feat(langchain_v1): tool retry middleware ( #33503 ) chore(langchain_v1): switch order of params in ToolRuntime ( #33518 ) feat(langchain_v1): injected runtime ( #33500 ) style: more sweeping refs work ( #33513 ) style: more work for refs ( #33508 ) release(langchain_v1): 1.0.0a15 ( #33505 ) fix(langchain_v1): keep state to relevant middlewares for tool/model call limits ( #33493 ) release(core): 1.0.0rc1 ( #33497 ) docs: update package READMEs ( #33488 ) chore(langchain_v1): remove invocation request ( #33482 ) feat(langchain_v1): add async implementations to wrap_model_call ( #33467 ) fix(langchain_v1): can not import "wrap_tool_call" from agents.… ( #33472 ) feat(langchain_v1): add override to model request and tool call request ( #33465 ) docs: create_agent style and clarify system_prompt ( #33470 ) fix(langchain): rename PlanningMiddleware to TodoListMiddleware ( #33476 ) fix(langchain_v1): export ModelResponse from agents.middleware ( #33453 ) ( #33454 ) chore(langchain_v1,anthropic): migrate anthropic middleware to langchain_anthropic ( #33463 ) chore(langchain_v1): use args for HITL ( #33442 ) chore(langchain_v1): bump release version ( #33440 ) chore(langchain_v1): improve error message ( #33433 ) chore(langchain_v1): remove langchain_text_splitters from test group ( #33425 ) chore(langchain_v1): stricter handling of sync vs. async for wrap_model_call and wrap_tool_call ( #33429 ) chore(langchain_v1): further namespace clean up ( #33428 ) feat(langchain_v1): add async implementation for wrap_tool_call ( #33420 ) chore(langchain_v1): tool error exceptions ( #33424 ) feat(langchain_v1): expand message exports ( #33419 ) style: fix tables, capitalization ( #33417 ) chore(langchain_v1): add RemoveMessage ( #33416 ) release(langchain_v1): v1.0.0a13 ( #33415 ) fix(langchain_v1): out of date docstring ( #33414 ) chore(langchain_v1): update on_tool_call to wrap_tool ( #33410 ) chore(langchain_v1): update wrap_on_model return ( #33408 ) feat(langchain_v1): tool emulator ( #33357 ) feat(langchain_v1): refactoring HITL API ( #33397 ) style: .. code-block:: admonition translations ( #33400 ) style: address Sphinx double-backtick snippet syntax ( #33389 ) chore: update Sphinx links to markdown ( #33386 ) style: remove more Optional syntax ( #33371 ) chore(langchain_v1): rename on_model_call to wrap_model_call ( #33370 ) chore(langchain_v1): update the uv lock file ( #33369 ) chore(langchain_v1): replace modify model request with on model call ( #33368 ) chore(langchain): add unit tests for wrap_tool_call decorator ( #33367 ) chore(langchain_v1): rename on_tool_call to wrap_tool_call ( #33366 ) chore(langchain_v1): add runtime and context to model request ( #33365 ) chore(langchain_v1): update on_tool_call to regular callbacks ( #33364 ) style: monorepo pass for refs ( #33359 ) chore(langchain_v1): simplify on model call logic ( #33358 ) chore: fix dropdown default open admonition in refs ( #33354 ) chore(langchain_v1): remove unused internal namespace ( #33352 ) feat(langchain_v1): add on_tool_call middleware hook ( #33329 ) feat(langchain_v1): on_model_call middleware ( #33328 ) remove runtime where not needed fix(langchain_v1): injection logic in tool node ( #33344 ) chore: enrich pyproject.toml files with links to new references, others ( #33343 ) chore: clean up pyproject.toml files, use core a7 ( #33334 ) chore(langchain): clean Makefile ( #33335 ) fix(langchain_v1): fix edges when there's no middleware ( #33321 ) release(langchain_v1): 1.0.0a12 ( #33314 ) chore(langchain_v1): rename model_request node -> model ( #33310 ) release(langchain_v1): 1.0.0a11 ( #33307 ) chore(langchain_v1): remove support for ToolNode in create_agent ( #33306 ) feat(langchain_v1): simplify to use ONE agent ( #33302 ) chore(langchain_v1): remove text splitters from langchain v1 namespace ( #33297 ) chore(langchain_v1): expose rate_limiters from langchain_core ( #33305 ) fix(langchain_v1): tool selector should use last human message ( #33294 ) feat(langchain_v1): before_agent and after_agent hooks ( #33279 ) feat(langchain_v1): Implement Context Editing Middleware ( #33267 ) feat(openai): enable stream_usage when using default base URL and client ( #33205 ) chore(infra): pdm -> hatchling ( #33289 ) feat(langchain_v1): Add retry_model_request middleware hook, add ModelFallbackMiddleware ( #33275 ) fix(langchain_v1): linting fixes for llm tool selector ( #33278 ) feat(langchain_v1): add llm selection middleware ( #33272 ) feat(langchain_v1): represent server side tools in modifyModelRequest and update tool handling ( #33274 ) feat(langchain_v1): Implement PIIMiddleware ( #33271 ) fix(langchain_v1): dynamic response format ( #33273 ) chore(langchain_v1): remove union return type in init_embeddings ( #33062 ) feat(langchain_v1): Add ToolCallLimitMiddleware ( #33269 ) chore(langchain_v1): change modifyModelRequest back to tools ( #33270 ) fix(langchain_v1): handle switching resposne format strategy based on model identity ( #33259 ) feat(langchain_v1): implement nicer devx for dynamic prompt ( #33264 ) feat(langchain_v1): description generator for HITL middleware ( #33195 ) chore(core,langchain,langchain_v1)!: remove globals from langchain-v1, update globals in langchain-classic, langchain-core ( #33251 ) chore(langchain_v1)!: Remove ToolNode from agents ( #33250 ) feat(langchain): model call limits ( #33178 ) chore: delete deprecated items ( #33192 ) chore(langchain_v1): uncomment some optional deps ( #33244 ) docs: v1 docs updates ( #33173 ) release: v1.0.0 ( #32567 ) feat(langchain_v1): update messages namespace ( #33207 ) feat(langchain): use decorators for jumps instead ( #33179 ) feat(langchain_v1): add async support for create_agent ( #33175 ) chore(langchain_v1): use list[str] for modifyModelRequest ( #33166 ) feat(langchain): Using Structured Response as Key in Output Schema for Middleware Agent ( #33159 ) chore(langchain_v1): expose middleware decorators and selected messages ( #33163 ) feat(langchain): todo middleware ( #33152 ) fix(langchain): handle gpt-5 model name in init_chat_model ( #33148 ) fix(langchain): add context_management to Anthropic chat model init ( #33150 ) fix(langchain): fix response action for HITL ( #33131 ) chore(langchain_v1): move tool node to tools namespace ( #33132 ) docs: more standardization ( #33124 ) docs: standardize .. code-block directive usage ( #33122 ) docs: correct ported over directives ( #33121 ) chore: bump ruff version to 0.13 ( #33043 ) chore: bump locks ( #33114 ) release(langchain): v1.0.0a9 ( #33098 ) fix(langchain): extra arg for anthropic caching, __end__ -> end for jump_to ( #33097 ) fix(langchain_v1): version equality check ( #33095 ) release(langchain): 1.0.0a8 ( #33090 ) feat(langchain): improvements to anthropic prompt caching ( #33058 ) style: repo linting pass ( #33089 ) fix(langchain): need to inject all state for tools registered by middleware ( #33087 ) chore(langchain): renaming for HITL ( #33067 ) chore(langchain): simplifying HITL condition ( #33065 ) fix(langchain_v1): only interrupt if at least one ToolConfig value is True ( #33064 ) feat(langchain): new decorator pattern for dynamically generated middleware ( #33053 ) fix(langchain): HITL bug causing dupe interrupt ( #33052 ) chore: update pyproject.toml files, remove codespell ( #33028 ) release(langchain): 1.0.0a6 ( #33024 ) fix(langchain): use state schema as input schema to middleware nodes ( #33023 ) feat(langchain): dynamic system prompt middleware ( #33006 ) feat(langchain): improved HITL patterns ( #32996 ) chore: restore commented out optional deps ( #32971 ) chore: bump mypy version to 1.18 ( #32914 ) release(langchain): v1.0.0a5 ( #32917 ) fix(langchain): use messages from model request ( #32908 ) fix(core): resolve mermaid node id collisions when special chars are used ( #32857 ) revert: "chore: remove ruff target-version" ( #32895 ) chore: remove ruff target-version ( #32880 ) chore(docs): update package README s ( #32869 ) feat(langchain): support PEP604 ( | union) in tool node error handlers ( #32861 ) chore(langchain): add ruff rule E501 in langchain_v1 ( #32812 ) chore(langchain): add ruff rule UP007 in langchain_v1 ( #32811 ) chore(langchain): enable ruff docstring-code-format in langchain_v1 ( #32855 ) chore(core): enable ruff docstring-code-format ( #32834 ) feat(langchain): middleware support in create_agent ( #32828 ) fix(langchain): fix mypy versions in langchain_v1 ( #32816 ) chore(langchain): cleanup langchain_v1 mypy config ( #32809 ) chore(langchain): add ruff rules D for langchain_v1 ( #32808 ) fix(langchain): update init version ( #32793 ) release(langchain): v1.0.0a3 ( #32791 ) chore(langchain): rename create_react_agent -> create_agent ( #32789 ) chore(langchain): remove upper bound at v1 for core ( #32737 ) chore(langchain): also bump text splitters ( #32722 ) chore(langchain): use latest core ( #32720 ) chore(langchain): revert back to static versioning for now ( #32719 ) release(langchain): v1.0.0a1 ( #32718 ) feat(langchain): revamped create_react_agent ( #32705 ) chore(langchain): remove untested chains for first alpha ( #32710 ) chore(langchain): drop Python 3.9 to prep for v1 ( #32704 ) chore: adress pytest-asyncio deprecation warnings + other nits ( #32696 ) chore: update references to use the latest version of Claude-3.5 Sonnet ( #32594 ) docs: update outdated README.md content ( #32540 ) fix(tests): add anthropic_proxy to configurable test parameters (for v1) chore: formatting across codebase ( #32466 ) feat(openai): minimal and verbosity ( #32455 ) feat(langchain): add stuff and map reduce chains ( #32333 ) fix: use new Google model names in examples ( #32288 ) fix: update bar_model to use the correct model version claude-3-7-sonnet-20250219 ( #32284 ) refactor: remove references to unsupported model claude-3-sonnet-20240229 ( #32281 ) fix: formatting issues in docstrings ( #32265 ) feat(docs): improve devx, fix Makefile targets ( #32237 ) chore(langchain_v1): clean anything uncertain ( #32228 ) feat(langchain): v1 scaffolding ( #32166 )