LangChain Updates & Release Notes

Changes since langchain-openai==1.2.1

release(openai): 1.2.2 (#37617)
chore(infra): bump langchain-tests floor to 1.1.9 (#37610)
test(openai): unbreak audio chat and Azure embedding integration tests (#37589)
fix(openai): guard httpx finalizers (#37570)
chore: bump langsmith from 0.8.4 to 0.8.5 in /libs/partners/openai (#37549)
chore: bump idna from 3.11 to 3.15 in /libs/partners/openai (#37548)
ci(infra): harden Dependabot version-bound preservation (#37510)
test(standard-tests): assert ls_model_name honors per-call model override (#37504)
fix(openai): source LLM context size from model profiles (#37489)
chore(core,langchain,openai): refresh stale OpenAI model references (#37487)
fix(openai): broaden condition for ContextOverflowError to accommodate other providers (#37457)
docs(openai): document base_url env var fallback chain (#37436)
chore: bump langsmith from 0.8.0 to 0.8.4 in /libs/partners/openai (#37416)
chore: bump langsmith from 0.7.31 to 0.8.0 in /libs/partners/openai (#37398)
chore(infra): merge v1.4 into master (#37350)
chore: bump urllib3 from 2.6.3 to 2.7.0 in /libs/partners/openai (#37330)
chore: bump langchain-core from 1.3.2 to 1.3.3 in /libs/partners/openai (#37266)
chore(docs): update x handle references (#37081)
chore(model-profiles): refresh model profile data (#37074)
chore(docs): update comment for chatopenai (#37034)
chore(model-profiles): refresh model profile data (#37015)

Original source

Changes since langchain-fireworks==1.3.1

• release(fireworks): 1.4.0 (#37582)
• feat(fireworks): migrate to fireworks-ai 1.x SDK (#37581)
• chore(model-profiles): refresh model profile data (#37574)
• chore: bump idna from 3.10 to 3.15 in /libs/partners/fireworks (#37527)
• ci(infra): harden Dependabot version-bound preservation (#37510)
• fix(fireworks): raise ContextOverflowError on prompt-too-long (#37458)
• chore: bump langsmith from 0.7.31 to 0.8.0 in /libs/partners/fireworks (#37404)
• chore: bump requests from 2.33.1 to 2.34.0 in /libs/partners/fireworks (#37355)
• chore: bump urllib3 from 2.6.3 to 2.7.0 in /libs/partners/fireworks (#37339)
• chore: bump langchain-core from 1.3.2 to 1.3.3 in /libs/partners/fireworks (#37279)

Original source

Changes since langchain-tests==1.1.7

• hotfix(standard-tests): set langchain-core version bounds (#37509)
• hotfix: bump lockfiles (#37508)
• release(standard-tests): 1.1.8 (#37507)
• test(standard-tests): assert ls_model_name honors per-call model override (#37504)
• chore(core,langchain,openai): refresh stale OpenAI model references (#37487)
• chore: bump langsmith from 0.7.31 to 0.8.0 in /libs/standard-tests (#37381)
• chore(infra): merge v1.4 into master (#37350)
• chore: bump urllib3 from 2.6.3 to 2.7.0 in /libs/standard-tests (#37324)
• chore: bump langchain-core from 1.3.2 to 1.3.3 in /libs/standard-tests (#37253)
• chore: bump types-pyyaml from 6.0.12.20250915 to 6.0.12.20260408 in /libs/standard-tests (#37125)
• chore(docs): update x handle references (#37081)

Original source

Changes since langchain-core==0.3.86

chore(infra): merge v1.4 into master (#37350)

chore: bump urllib3 from 2.6.3 to 2.7.0 in /libs/core (#37329)

fix(core): avoid eager pydantic.v1 import in @deprecated (#37308)

chore: bump mistune from 3.1.4 to 3.2.1 in /libs/core (#37237)

chore: bump jupyter-server from 2.17.0 to 2.18.0 in /libs/core (#37204)

release(core): 1.3.3 (#37198)

fix(core): set deprecation since to 1.3.3 to match release (#37200)

fix(core, langchain): harden load() against untrusted manifests (#37197)

chore: bump notebook from 7.5.0 to 7.5.6 in /libs/core (#37109)

chore: bump types-pyyaml from 6.0.12.20250915 to 6.0.12.20260408 in /libs/core (#37129)

fix(core): preserve structured inputs on tool runs in tracers (#37108)

release(perplexity): 1.2.0 (#37091)

chore(docs): update x handle references (#37081)

fix(core): make removal optional in warn_deprecated (#37056)

fix(core): validate batch_size in _batch and _abatch to prevent infinite loop (#36663)

chore(core): mark stream_v2/astream_v2 as beta (#36992)

release(core): 1.3.2 (#36990)

feat(core): add content-block-centric streaming (v2) (#36834)

release(core): 1.3.1 (#36972)

feat(core): allow _format_output to pass through list of ToolOutputMixin instances (#36963)

chore: bump nbconvert from 7.17.0 to 7.17.1 in /libs/core (#36923)

feat(core): Update inheritance behavior for tracer metadata for special keys (#36900)

chore: bump langsmith from 0.7.13 to 0.7.31 in /libs/core (#36813)

release(core): release 1.3.0 (#36851)

release(core): 1.3.0a3 (#36829)

chore(core): keep checkpoint_ns behavior in streaming metadata for backwards compat (#36828)

feat(core): Add chat model and LLM invocation params to traceable metadata (#36771)

fix(core): restore cloud metadata IPs and link-local range in SSRF policy (#36816)

chore(deps): bump pytest to 9.0.3 (#36801)

chore(core): harden private SSRF utilities (#36768)

fix(openai): handle content blocks without type key in responses api conversion (#36725)

chore: bump pytest from 9.0.2 to 9.0.3 in /libs/core (#36719)

release(core): 1.3.0.a2 (#36698)

fix(core): Use reference counting for storing inherited run trees to support garbage collection (#36660)

docs(core): nit (#36685)

release(core): 1.3.0a1 (#36656)

chore(core): reduce streaming metadata / perf (#36588)

release(core): release 1.2.28 (#36614)

fix(core): add more sanitization to templates (#36612)

release(core): 1.2.27 (#36586)

fix(core): handle symlinks in deprecated prompt save path (#36585)

chore: add comment explaining pygments>=2.20.0 (#36570)

release(core): 1.2.26 (#36511)

fix(core): add init validator and serialization mappings for Bedrock models (#34510)

feat(core): add ChatBaseten to serializable mapping (#36510)

chore(core): drop gpt-3.5-turbo from docstrings (#36497)

fix(core): correct parameter names in filter_messages docstring example (#36462)

release(core): 1.2.25 (#36473)

fix(core): harden check for txt files in deprecated prompt loading functions (#36471)

fix(core): fixed typos in the documentation (#36459)

release(core): 1.2.24 (#36434)

feat(core): impute placeholder filenames for OpenAI file inputs (#36433)

chore: pygments>=2.20.0 across all packages (CVE-2026-4539) (#36385)

fix(core): add "computer" to _WellKnownOpenAITools (#36261)

release(core): 1.2.23 (#36323)

revert: Revert "fix(core): trace invocation params in metadata" (#36322)

chore: bump requests from 2.32.5 to 2.33.0 in /libs/core (#36243)

release(core): 1.2.22 (#36201)

fix(core): validate paths in prompt.save and load_prompt, deprecate methods (#36200)

release(core): 1.2.21 (#36179)

fix(core,model-profiles): add missing ModelProfile fields, warn on schema drift (#36129)

chore(core): remove stale blockbuster allowlist for deleted context module (#36168)

ci: suppress pytest streaming output in CI (#36092)

release(core): 1.2.20 (#36085)

fix(core): trace invocation params in metadata (#36080)

feat: Add LangSmith integration metadata to create_agent and init_chat_model (#35810)

feat(core): harden anti-ssrf (#35960)

ci: avoid unnecessary dep installs in lint targets (#36046)

docs(core): document base_url in mermaid api (#35961)

chore: bump orjson from 3.11.5 to 3.11.6 in /libs/core (#35805)

chore: housekeeping (#35850)

release(core): 1.2.19 (#35832)

chore(core): move BaseCrossEncoder to langchain-core (#35809)

chore: bump tornado from 6.5.2 to 6.5.5 in /libs/core (#35775)

release(core): 1.2.18 (#35704)

fix(core): fix double backticks in deprecation docstring for alternative_import (#35658)

fix(core): preserve default_factory when generating tool call schema (#35550)

feat(openai): support tool search (#35582)

chore: bump the minor-and-patch group across 3 directories with 7 updates (#35605)

release(core): 1.2.17 (#35527)

fix(core): extract usage metadata from serialized tracer message outputs (#35526)

chore: bump the langchain-deps group across 3 directories with 7 updates (#35513)

chore: bump the langchain-deps group across 3 directories with 14 updates (#35441)

release(core): 1.2.16 (#35439)

fix(core): treat empty tool chunk ids as missing in merge (#35414)

fix(core): improve error message for non-JSON-serializable tool schemas (#34376)

fix(core): improve typing/docs for on_chat_model_start to clarify required positional args (#35324)

perf(core): defer specific langsmith imports to reduce import time (#35298)

revert: add ChatAnthropicBedrockWrapper (#35371)

release(core): 1.2.15 (#35367)

fix(anthropic): replace retired model IDs in tests and docstrings (#35365)

feat(anthropic): add ChatAnthropicBedrock wrapper (#35091)

style: fix some ruff noqa (#35321)

release(core): 1.2.14 (#35328)

chore(core): remove langserve from sys info util, add deepagents (#35325)

fix(core): fix merge_lists incorrectly merging parallel tool calls (#35281)

fix(core): accept int temperature in _get_ls_params for LangSmith tracing (#35302)

revert: accept integer temperature values in _get_ls_params (#35319)

fix(core): accept integer temperature values in _get_ls_params (#35317)

docs(core): update load note to be precise (#35309)

fix(core): prevent recursion error when args_schema is dict (#35260)

fix(core): preserve index and timestamp fields when merging (#34731)

docs(core): add security warnings and best practices for deserialization (#35282)

docs: fix docstring inaccuracies and update outdated LangSmith URLs (#35283)

fix(core): correct misleading jinja2 sandboxing comment (#35183)

chore: bump the langchain-deps group across 3 directories with 8 updates (#35257)

release(core): 1.2.13 (#35230)

docs(core): expanded get_lc_namespace docstring (#35229)

feat(openrouter): add langchain-openrouter provider package (#35211)

style: bump ruff version to 0.15 (#35042)

release(core): 1.2.12 (#35192)

fix(core): fix setting ChatGeneration.text (#35191)

release(core): 1.2.11 (#35144)

fix(openai): sanitize urls when counting tokens in images (#35143)

chore(core): clean up docstring mismatch and redundant logic in langchain-core (#35064)

fix(core): replace bare except with Exception in tracer (#35138)

release(core): 1.2.10 (#35136)

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)

feat(core): add ContextOverflowError, raise in anthropic and openai (#35099)

feat(model-profiles): add text_inputs and text_outputs (#35084)

feat(core): count tokens from tool schemas in count_tokens_approximately (#35098)

docs(core): add missing name docstring for RunnableSerializable (#35088)

release(core): 1.2.9 (#35025)

fix(core): adjust cap when scaling approximate token counts (#35017)

revert: precompile hex color regex pattern at module level (#35016)

chore: add make type target (#35015)

revert: "chore: add typing target in Makefile" (#35013)

chore: add typing target in Makefile (#35012)

fix(core): apply cap when scaling approximate token counts (#35005)

feat(core): allow scaling by reported usage when counting tokens approximately (#34996)

test(core): increase delta_time for flaky test (#34982)

chore: enrich pyproject.toml files (#34980)

release(core): 1.2.8 (#34975)

docs(core): add examples for pretty_repr, pretty_print (#34968)

docs(core): use proper admonition for get_buffer_string (#34967)

docs: add usage examples to core classes (#34841)

chore(core): fix docstring format (#34966)

chore(deps): bump the uv group across 20 directories with 3 updates (#34941)

docs: add example to create_message function docstring (#34851)

docs(core): clarify tool decorator argument and return type requirements (#34860)

fix(core): fix nested mustache variable extraction and update docs (#34872)

fix(core): allow base model annotations for empty model (#34932)

chore: upgrade urllib3 to 2.6.3 (#34940)

fix(core): prevent crash in ParrotFakeChatModel when messages list is empty (#34943)

fix(core): google docstring parsing with no arguments/reserved arguments (#34861)

test(core): add tests for approximate token counting with multimodal messages (#34898)

fix(core): replace Iterable with Iterator for block iteration (#34934)

fix(core): yield_blobs returns Iterator (#34935)

docs: Fix typo in Runnable description of async variants (#34905)

fix(core): raise outputparserexception for unknown tools (#34923)

docs(core): nit (#34914)

chore(core): nits (#34897)

feat(core): add multimodal support to count_tokens_approximately (#34883)

fix(core): fix typo 'use a a' -> 'use as a' in check_version.py (#34878)

style(core): lint (#34862)

feat(core): add XML format option for get_buffer_string (#34802)

chore(core): relax packaging constraints (#34832)

chore(deps-dev): bump setuptools from 67.8.0 to 78.1.1 in /libs/core in the uv group across 1 directory (#34825)

chore(core, langchain): add version consistency check pre-commit hooks (#34782)

docs(core): enhance docstring for RunnableConfig for clarity on total=False (#34756)

docs(core): clean up callbacks param descriptions (#34738)

fix(core): correctly guard against non-text-block types (#34729)

chore: update twitter URLs (#34736)

refactor(core): generalize comma_list utility to support any Iterable (#34714)

fix(core): add explicit tags parameter to sync LLMManagerMixin methods (#34722)

docs(core): enhance docstrings for ToolCall and ToolCallChunk (#34719)

fix(core): add tool_call_id to on_tool_error event data (#33731)

fix(core): improve error message for missing title in JSON schema functions (#34683)

fix(core): make yield_keys prefix keyword-only to match BaseStore (#34659)

chore(core): bump lock (#34695)

chore(core): improve types for RunnableLambda (#34539)

chore(core): improve types for StreamingRunnable (#34540)

style(core): fix some noqa escapes (#34675)

style: bump ruff version to 0.14.11 (#34674)

fix: remove relative imports (#34680)

release: langchain-core 1.2.7 (#34678)

fix: don't trace injected args only found in signature (#34670)

feat(core): add more file extensions to ignore in HTML link extraction (#34552)

refactor(core): improve docstrings for HTML link extraction utilities (#34550)

test(core): add edge case for empty examples in LengthBasedExampleSelector (#34641)

fix(core): fix strict schema generation for functions with optional args (#34599)

feat(core): support custom message separator in get_buffer_string() (#34569)

refactor(core): add warning for fallback GPT-2 tokenizer usage (#34621)

fix(core,langchain): use get_buffer_string for message summarization (#34607)

test(core): add tests for formatting utils and merge functions (#34511)

fix(core): strip message IDs from cache keys using model_copy (#33915)

fix(core): exclude injected args from tool schema (#34582)

refactor(core): select chunk_id via ranking and remove extra allocation (#34588)

release(core): 1.2.6 (#34586)

chore(core): Update LangChainTracer to use Pydantic v2 methods (#34541)

docs(core): add docstrings to internal helper functions (#34525)

docs(core): refresh content.py docstrings (#34546)

chore(deps): bump mypy to v1.19 and ruff to v1.14 (#34521)

refactor(core): fix some missing generic types (#31658)

style(core): add ruff RUF012 rule (#34492)

fix(core): support (message class, template) tuples in ChatPromptTemplate.from_messages (#33989)

test(core): add regression test for list-index $ref resolution (#34097)

fix(core): fix callback manager merge mixing handlers (#32028) (#33617)

style: add ruff ISC001 rule (#34493)

style(core): fix mypy no-any-return violations (#34204)

docs(core): image url docstring enhancement (#34488)

test(core): URL-encode bgColor parameter in mermaid.ink API calls (#34466)

style(core): fix some noqa: ARG rules (#34437)

fix(core): URL-encode bgColor in mermaid API calls (#34461)

perf(core): move origin type map to module level in function_calling.py (#34481)

style(core): add ruff rules TC (#34476)

perf(core): precompile hex color regex pattern at module level (#34480)

docs(core): update to indicate betas (#34457)

release(core): 1.2.5 (#34456)

fix(core): serialization patch (#34455)

fix(core): RunnablePick method return types (#34208)

fix(core): preserve Field(description=...) in @tool decorator (#34354)

fix(core): populate default args from tool's args_schema (#34399)

fix(core): use tool_calls instead of deprecated function_call in get_buffer_string (#34355)

feat(core): add PEP 702 deprecated attribute support to @deprecated (#34257)

fix(core): ensure tool_call_count is never null (#34431)

feat(core): automatically count and store meta for tool call count (#33756)

feat(core): add 'approximate' alias in place of count_tokens_approximately (#33045)

chore(core): fix some ruff preview rules (#34425)

release(core): 1.2.4 (#34429)

feat(core): add usage_metadata to metadata in LangChainTracer (#34414)

fix(core): defer persisting traces for iterator inputs (#34416)

chore(core): fix some docstrings (#34426)

release(core): 1.2.3 (#34421)

fix(core): allow unknown blocks in convert_to_openai_messages (#34420)

feat(infra): add CI check for out of date lockfiles (#34397)

chore(core): bump lockfile (#34392)

release(core): 1.2.2 (#34391)

fix(core): use get_type_hints for Python 3.14 TypedDict compatibility (#34390)

release(core): 1.2.1 (#34370)

fix(core): handle None arguments in parse_tool_call (#34242)

chore(core): fix some types related to ToolCallChunk (#34283)

release(core): 1.2 (#34319)

style(core): docs nit (#34312)

fix(core): widen openai tool/function conversion input type to Mapping (#34304)

chore(core): add admonitions around use of load (#34285)

feat(core,anthropic): extras on BaseTool (#34120)

release: langchain-core 1.1.3 (#34266)

fix(core): undo jinja2 restrictions (#34072)

fix: remove partial usage for retriever func + afunc (#34265)

release(core): 1.1.2 (#34253)

fix(core): pass tool_call_id to on_tool_start callback (#34235)

chore(core): improve typing of messages utils functions (#34225)

fix(core): prevent async task garbage collection (RUF006) (#34238)

chore(core): use anext and deprecate py_anext (#34211)

feat(core): support google maps grounding in genai block translator (#34244)

docs(core,groq,openai): nits for ref docs (#34243)

docs(core): improve style for refs (#34227)

docs(core): update StrOutputParser docstring (#34213)

release: langchain-core 1.1.1 (#34212)

feat: Use uuid7 for run ids (#34172)

fix: tool call id bug introduced w/ runtime injection (#34185)

chore: update test to be compatible with mem-optimized runtree (#34176)

docs(core): update docstrings in RunnableConfig, dereference_refs (#34131)

docs(anthropic,core,langchain): updates (#34106)

style(core,langchain,qdrant): fix some docstrings for refs (#34105)

fix(core): handle missing StructuredPrompt schema (#34096)

fix(core): ensure_ascii=False in PydanticOutputParser exception formatting (#34006)

fix(infra,core): nits (#34079)

style(core,langchain-classic,openai): fix griffe warnings (#34074)

chore(docs): fix a few refs syntax errors (#34044)

release(core): 1.1.0 (#34063)

feat(model-profiles): distribute data across packages (#34024)

release(core): 1.0.7 (#34036)

fix(core): fix validation for input variables in f-string templates, restrict functionality supported by jinja2, mustache templates (#34035)

release: langchain-core 1.0.6 (#34018)

chore: Support tool runtime injection when custom args schema is prov… (#33999)

feat(core): add proxy support for mermaid png rendering (#32400)

release(core): 1.0.5 (#33973)

fix(core): don't mask exceptions (#33959)

docs(core): add clarity to base token counting methods (#33958)

chore(core,infra): nits (#33954)

chore(core): fix some ruff TC rules (#33929)

chore: update README.md files (#33919)

test(core): add comprehensive tests for groq block translator (#33906)

revert(core): "applied secrets_map in load to plain string values" (#33913)

fix(core): applied secrets_map in load to plain string values (#33678)

release(core): 1.0.4 (#33886)

feat(core): support draw subgraph using pygraphviz (#32966)

fix(core): Fix tool name check in name_dict for PydanticToolsParser (#33479)

fix(core): Filter empty content blocks from formatted prompts (#32519)

fix(core): context preservation in shielded async callbacks (#32163)

fix(core): RunnablePick may not return a dict if keys is a string (#31321)

fix(core): fix Runnable parallel schema being empty when children runnable input schemas use TypedDict (#28196)

docs: fix typos in libs/core/langchain_core/utils/function_calling.py (#33873)

docs: fix typos in libs/core/tests/unit_tests/utils/test_strings.py (#33875)

docs: fix typos in libs/core/tests/unit_tests/indexing/test_hashed_document.py (#33874)

docs: fix typos in libs/core/tests/unit_tests/test_tools.py (#33876)

docs: fix typos in some files (#33867)

style: some cleanup (#33857)

chore: attribute package change versions (#33854)

fix(core): handle missing dependency version information (#33844)

chore: correct langchain-community references (#33827)

chore(core): add ruff rule PLR2004 (#33706)

chore(core): clean pyproject formatting (#33821)

docs(model-profiles): fix typo (#33820)

style: refs pass (#33813)

fix(core): add no colors check (#33780)

release(core): 1.0.3 (#33768)

style: misc refs work (#33771)

docs(core): improve tools module docstrings (#33755)

feat(core): mint langchain-model-profiles and add profile property to BaseChatModel (#33728)

chore: use model IDs, latest anthropic models (#33747)

release: core 1.0.2 and langchain 1.0.3 (#33736)

fix: filter out injected args from tracing (#33729)

style: more refs fixes (#33730)

fix(core): improve JSON get_format_instructions using Opik Agent Optimizer (#33718)

style(core): more cleanup all around (#33711)

style: more refs work (#33707)

fix(core): translate Google GenAI text blocks to v1 (#33699)

feat(langchain): export UsageMetadata (#33692)

fix: links (#33691)

fix(core): fix PydanticOutputParser's get_format_instructions for v1 models (#32479)

refactor(core): Minor refactor for code readability (#33674)

fix(infra): add emacs backup files to gitignore (#33675)

fix: update some links (#33686)

style(core): more refs work (#33664)

fix(core): make handling of schemas more defensive (#33660)

release(core): 1.0.1 (#33639)

feat(core): automatic set required to include all properties in strict mode (#32930)

docs(core): Updated docs for mustache_template_vars (#33481)

style: even more refs work (#33619)

style: more refs work (#33616)

style: more refs polishing (#33601)

ci(infra): test CodSpeed with Python 3.13 (#33599)

style(anthropic): use aliases for model names (#33590)

chore: update pyproject.toml url entries (#33587)

release(core): 1.0.0 (#33562)

fix(core): support for Python 3.14 (#33461)

docs: more fixes for refs (#33554)

release: joint rcs for core + langchain (#33549)

chore(langchain): allow injection of ToolRuntime and generic ToolRuntime[ContextT, StateT] (#33546)

chore: more sweeping (#33533)

release(core): 1.0.0rc2 (#33530)

docs(anthropic): update extended thinking docs and fix urls (#33525)

feat(core): support vertexai standard content (#33521)

style: more sweeping refs work (#33513)

style: more work for refs (#33508)

feat(core): include original block type in server tool results for google-genai (#33502)

release(core): 1.0.0rc1 (#33497)

chore(core): delete BaseMemory, move to langchain-classic (#33373)

docs: update package READMEs (#33488)

fix(core): propagate extras when aggregating tool calls in v1 content (#33494)

chore(core): delete items marked for removal in schemas.py (#33375)

fix(docs): Fix several typos and grammar (#33487)

chore(core): delete function_calling.py utils marked for removal (#33376)

chore(core): delete pydantic_v1/ (#33374)

feat(groq): support built-in tools in message content (#33459)

chore(core): delete get_relevant_documents (#33378)

style: llm -> model (#33423)

chore(langchain): remove arg types from docstrings (#33413)

style: fix tables, capitalization (#33417)

fix(core): handle parent/child mustache vars (#33345)

style: remove Defaults to None (#33404)

style: .. code-block:: admonition translations (#33400)

style: address Sphinx double-backtick snippet syntax (#33389)

chore(core): remove arg types from docstrings (#33388)

chore: update Sphinx links to markdown (#33386)

fix(core): override streaming callback if streaming attribute is set (#33351)

refactor(core): clean up sys_info.py (#33372)

style: remove more Optional syntax (#33371)

chore: drop UP045 (#33362)

refactor(core): remove keep-runtime-typing from pyproject.toml following dropping 3.9 (#33360)

style: monorepo pass for refs (#33359)

fix(core): don't print package if no version found (#33347)

chore: enrich pyproject.toml files with links to new references, others (#33343)

release(core): 1.0.0a8 (#33341)

fix(core): add back add_user_message and add_ai_message (#33340)

release(core): 1.0.0a7 (#33309)

fix(core,openai,anthropic): delegate to core implementation on invoke when streaming=True (#33308)

fix(core): fix string content when streaming output_version="v1" (#33261)

chore(infra): pdm -> hatchling (#33289)

style(core): drop python 39 linting target for 3.10 (#33286)

chore(core): docstring nits (#33285)

chore(core,langchain,langchain_v1)!: remove globals from langchain-v1, update globals in langchain-classic, langchain-core (#33251)

feat(core): add optional include_id param to convert_to_openai_messages function (#33242)

chore: delete deprecated items (#33192)

docs: v1 docs updates (#33173)

release: v1.0.0 (#32567)

Original source

Initial release
release(langchain): 1.3.0a2 (#37225)
release(langchain): 1.3.0a2 (#37224)
fix(langchain): ordered schema resolution — list replaces set so state_schema wins (#37223)
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 Sends (#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 READMEs (#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)

Original source

Changes since langchain-core==1.3.2

release(core): 1.3.3 (#37198)

fix(core): set deprecation since to 1.3.3 to match release (#37200)

fix(core, langchain): harden load() against untrusted manifests (#37197)

chore: bump notebook from 7.5.0 to 7.5.6 in /libs/core (#37109)

chore: bump types-pyyaml from 6.0.12.20250915 to 6.0.12.20260408 in /libs/core (#37129)

fix(core): preserve structured inputs on tool runs in tracers (#37108)

release(perplexity): 1.2.0 (#37091)

chore(docs): update x handle references (#37081)

fix(core): make removal optional in warn_deprecated (#37056)

fix(core): validate batch_size in _batch and _abatch to prevent infinite loop (#36663)

chore(core): mark stream_v2/astream_v2 as beta (#36992)

Original source