feat: add support for Langchain 1.0 by ogabrielluiz · Pull Request #11114 · langflow-ai/langflow

ogabrielluiz · 2025-12-19T16:43:41Z

Summary

Upgrades to LangChain 1.0 ecosystem (langchain ~=1.2.0, langchain-core ~=1.2.3, langchain-community ~=0.4.1). All langchain-* integration packages updated to versions compatible with langchain-core 1.0+.

Previously Blocked Dependencies (All Resolved)

cuga (~=0.2.9) - Updated to 0.2.9 which supports langchain 1.0
mlx / mlx-vlm - Resolved: opencv-python 4.13+ supports numpy>=2
nv-ingest - Resolved in nv-ingest 26.1.1 (removed openai dependency)

Other Notable Changes

elasticsearch bumped to >=8.19.0 (required by langchain-elasticsearch 1.0.0)
google-api-python-client bumped to >=2.161.0 (required by langchain-google-community 3.0+)
pyarrow bumped to >=19.0.1 (required by langchain-google-vertexai 3.0+)

Closes #10734

- langchain ~=1.2.0 - langchain-core ~=1.2.3 - langchain-community ~=0.4.1 Updated all langchain-* integration packages to versions compatible with langchain-core 1.0+.

coderabbitai · 2025-12-19T16:43:50Z

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Walkthrough

The pull request upgrades LangChain to v1.2.0 across the project. Core changes include updating pyproject.toml dependencies to v1.x with compatible version ranges, introducing langchain-classic v1.0.0 for backward compatibility, and updating all affected imports from langchain.* to langchain_classic.* modules. Additional dependencies are also updated to compatible ranges.

Changes

Cohort / File(s)	Summary
Root dependency manifest `pyproject.toml`	Upgrades langchain from 0.3.23 (exact) to ~~=1.2.0; updates multiple langchain- packages from exact pins to compatible ranges (~~= or >=); updates elasticsearch 8.16.0 → >=8.19.0, google-api-python-client 2.154.0 → >=2.161.0, pyarrow 19.0.0 → >=19.0.1; removes cuga dependency; updates nv-ingest pairs to >=26.1.0; shifts version policy from exact pins to compatible ranges.
Backend base dependencies `src/backend/base/pyproject.toml`	Upgrades langchain family packages: langchain ~=0.3.21 → ~=1.2.0, langchain-community >=0.3.0,<1.0.0 → ~=0.4.1, langchain-core >=0.3.45,<1.0.0 → ~=1.2.3, langchain-experimental >=0.3.0,<1.0.0 → ~=0.4.1, langchain-ibm >=0.3.8,<1.0.0 → ~=1.0.2, langchain-chroma >=0.1.4,<1.0.0 → ~=0.2.6.
LFX dependencies `src/lfx/pyproject.toml`	Upgrades langchain ~=0.3.23 → ~=1.2.0, langchain-core >=0.3.66,<1.0.0 → ~~=1.2.3; adds new dependency langchain-classic~~=1.0.0; updates langchain-openai >=0.3.0,<1.0.0 → >=1.1.6,<2.0.0, langchain-community >=0.3.0,<1.0.0 → >=0.4.1,<1.0.0.
Agent import updates `src/lfx/src/lfx/base/agents/agent.py`, `src/lfx/src/lfx/base/agents/altk_base_agent.py`, `src/lfx/src/lfx/base/agents/utils.py`	Updates imports to use langchain_classic.* modules instead of langchain.* (e.g., langchain.agents → langchain_classic.agents, langchain.agents.agent_toolkits → langchain_classic.agents.agent_toolkits). No functional logic changes.
Component import updates `src/lfx/src/lfx/components/langchain_utilities/json_agent.py`, `src/lfx/src/lfx/components/langchain_utilities/openapi.py`, `src/lfx/src/lfx/components/langchain_utilities/runnable_executor.py`, `src/lfx/src/lfx/components/langchain_utilities/sql.py`, `src/lfx/src/lfx/components/langchain_utilities/vector_store_router.py`	Updates AgentExecutor and related imports from langchain.agents to langchain_classic.agents; updates VectorStoreRouterToolkit imports to use langchain_classic paths. No control flow modifications.
Callback and typing updates `src/lfx/src/lfx/base/agents/callback.py`, `src/lfx/src/lfx/field_typing/constants.py`	Moves AsyncCallbackHandler import from langchain.callbacks.base to langchain_core.callbacks.base; updates LANGCHAIN_IMPORT_STRING constant and safe imports to reference langchain_classic.* modules.
Service dependency optimization `src/lfx/src/lfx/services/deps.py`	Moves InvalidRequestError import from top-level to conditional exception handling block inside session_scope(); preserves rollback behavior.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 7 | ❌ 2

❌ Failed checks (1 error, 1 warning)

Check name	Status	Explanation	Resolution
Test Coverage For New Implementations	❌ Error	PR modifies 16 source files for LangChain 1.0 upgrade using langchain_classic imports but lacks dedicated tests validating the import migration and compatibility.	Add tests for langchain_classic import migration including unit tests for module imports, regression tests for agent components, integration tests for utilities, and field_typing validation.
Test File Naming And Structure	⚠️ Warning	PR modifies 14 Python source files changing imports from langchain.* to langchain_classic.* or langchain_core.* but existing test files were not updated or validated to verify compatibility with new import paths.	Run test suite with updated imports and update any failing tests to use new langchain_classic or langchain_core import paths to verify LangChain 1.0 migration compatibility.

✅ Passed checks (7 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The pull request successfully implements the core requirement from `#10734` to upgrade langchain to version > 1.0 (upgraded to ~1.2.0) and ensures compatibility with LangChain 1.0 ecosystem.
Out of Scope Changes check	✅ Passed	All changes are directly related to the LangChain 1.0 upgrade objective. Import refactoring (langchain → langchain_classic), dependency version updates, and integration compatibility adjustments are within scope.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Test Quality And Coverage	✅ Passed	LangChain 1.0 migration PR with dependency updates and import refactoring, plus lazy import optimization in session_scope(). Existing test suite extensively covers affected code through async context manager tests in fixtures and agent component tests.
Excessive Mock Usage Warning	✅ Passed	PR contains only dependency updates and import refactoring with no test file modifications, making mock usage check not applicable.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title "feat: add support for Langchain 1.0" clearly and concisely describes the main objective of the changeset—upgrading the codebase to support LangChain 1.0 by updating dependencies and refactoring imports across multiple files.

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edwinjosechittilappilly · 2025-12-19T17:03:57Z

@ogabrielluiz I agree. Also will this have deprecated functions in Agent Execution?

LangChain 1.0 removed AgentExecutor and related classes to langchain-classic. This adds the dependency to maintain backward compatibility.

- Move AgentExecutor, agent creators from langchain to langchain_classic - Move AsyncCallbackHandler from langchain.callbacks to langchain_core.callbacks - Move Chain, BaseChatMemory from langchain to langchain_classic - Update LANGCHAIN_IMPORT_STRING for code generation

LangChain 1.0 no longer includes sqlalchemy as a transitive dependency. Move the import inside the function where it's used to avoid import errors when sqlalchemy is not installed.

ogabrielluiz · 2025-12-21T20:12:53Z

@ogabrielluiz I agree. Also will this have deprecated functions in Agent Execution?

I think we can keep them on this PR then start moving things to legacy and update the Agent to either use our agent or create_agent.

- Uncomment nv-ingest-api and nv-ingest-client, update to >=26.1.0 (no longer has openai version conflict) - Bump datasets from <4.0.0 to <5.0.0 to allow fsspec>=2025.5.1 required by nv-ingest - Update mlx-vlm TODO comment with accurate blocking reason

nv-ingest 26.1.1 removes the openai dependency, resolving the conflict with langchain-openai>=1.0.0 (which requires openai>=1.109.1). Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

opencv-python 4.13+ now supports numpy>=2, resolving the conflict with langchain-aws>=1.0.0 (which requires numpy>=2.2 on Python 3.12+). Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Update lfx integration deps to langchain 1.0 compatible versions. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

# Conflicts: # src/backend/base/langflow/api/v1/knowledge_bases.py # src/backend/base/langflow/initial_setup/starter_projects/Basic Prompt Chaining.json # src/backend/base/langflow/initial_setup/starter_projects/Basic Prompting.json # src/backend/base/langflow/initial_setup/starter_projects/Blog Writer.json # src/backend/base/langflow/initial_setup/starter_projects/Custom Component Generator.json # src/backend/base/langflow/initial_setup/starter_projects/Document Q&A.json # src/backend/base/langflow/initial_setup/starter_projects/Financial Report Parser.json # src/backend/base/langflow/initial_setup/starter_projects/Hybrid Search RAG.json # src/backend/base/langflow/initial_setup/starter_projects/Image Sentiment Analysis.json # src/backend/base/langflow/initial_setup/starter_projects/Instagram Copywriter.json # src/backend/base/langflow/initial_setup/starter_projects/Invoice Summarizer.json # src/backend/base/langflow/initial_setup/starter_projects/Knowledge Ingestion.json # src/backend/base/langflow/initial_setup/starter_projects/Knowledge Retrieval.json # src/backend/base/langflow/initial_setup/starter_projects/Market Research.json # src/backend/base/langflow/initial_setup/starter_projects/Meeting Summary.json # src/backend/base/langflow/initial_setup/starter_projects/Memory Chatbot.json # src/backend/base/langflow/initial_setup/starter_projects/News Aggregator.json # src/backend/base/langflow/initial_setup/starter_projects/Nvidia Remix.json # src/backend/base/langflow/initial_setup/starter_projects/Pokédex Agent.json # src/backend/base/langflow/initial_setup/starter_projects/Portfolio Website Code Generator.json # src/backend/base/langflow/initial_setup/starter_projects/Price Deal Finder.json # src/backend/base/langflow/initial_setup/starter_projects/Research Agent.json # src/backend/base/langflow/initial_setup/starter_projects/Research Translation Loop.json # src/backend/base/langflow/initial_setup/starter_projects/SEO Keyword Generator.json # src/backend/base/langflow/initial_setup/starter_projects/SaaS Pricing.json # src/backend/base/langflow/initial_setup/starter_projects/Search agent.json # src/backend/base/langflow/initial_setup/starter_projects/Sequential Tasks Agents.json # src/backend/base/langflow/initial_setup/starter_projects/Simple Agent.json # src/backend/base/langflow/initial_setup/starter_projects/Social Media Agent.json # src/backend/base/langflow/initial_setup/starter_projects/Text Sentiment Analysis.json # src/backend/base/langflow/initial_setup/starter_projects/Travel Planning Agents.json # src/backend/base/langflow/initial_setup/starter_projects/Twitter Thread Generator.json # src/backend/base/langflow/initial_setup/starter_projects/Vector Store RAG.json # src/backend/base/langflow/initial_setup/starter_projects/Youtube Analysis.json # src/backend/base/pyproject.toml # src/lfx/src/lfx/_assets/component_index.json # src/lfx/src/lfx/_assets/stable_hash_history.json # src/lfx/src/lfx/components/langchain_utilities/openai_tools.py # src/lfx/src/lfx/components/langchain_utilities/tool_calling.py # src/lfx/src/lfx/components/langchain_utilities/xml_agent.py # uv.lock

…ect JSON files

… compatibility

jordanrfrazier

Ran a few flows fine. Probably just needs extensive QA to make sure everything functions as normal now

before it was attempting to pull release-notes as letters are alphanumerically after numbers when we sort -V then grab tail now we only look at branch names that follow the pattern '^release-[0-9]+\.[0-9]+\.[0-9]+$'

add-back-svg

…onents Old flows using removed langchain imports (e.g. langchain.memory, langchain.schema, langchain.chains) now resolve via langchain_classic at two levels: module-level for entirely removed modules, and attribute-level for removed attributes in modules that still exist in langchain 1.0. New langchain 1.0 imports are never affected since fallbacks only trigger on import failure.

erichare

LGTM!

feat: upgrade to LangChain 1.0

a54db5b

- langchain ~=1.2.0 - langchain-core ~=1.2.3 - langchain-community ~=0.4.1 Updated all langchain-* integration packages to versions compatible with langchain-core 1.0+.

github-actions Bot added community Pull Request from an external contributor enhancement New feature or request labels Dec 19, 2025

ogabrielluiz added 4 commits December 19, 2025 16:05

feat(lfx): add langchain-classic dependency for legacy agent classes

7b158eb

LangChain 1.0 removed AgentExecutor and related classes to langchain-classic. This adds the dependency to maintain backward compatibility.

fix(lfx): make sqlalchemy import lazy in session_scope

abc6a55

LangChain 1.0 no longer includes sqlalchemy as a transitive dependency. Move the import inside the function where it's used to avoid import errors when sqlalchemy is not installed.

chore: update uv.lock for langchain-classic

0a2f571

github-actions Bot added enhancement New feature or request and removed enhancement New feature or request labels Dec 19, 2025

ogabrielluiz removed the community Pull Request from an external contributor label Dec 21, 2025

Cristhianzl force-pushed the main branch from 16c748b to e13d33e Compare January 7, 2026 19:17

github-actions Bot added enhancement New feature or request and removed enhancement New feature or request labels Jan 12, 2026

chore: update nv-ingest to 26.1.1

6d4f156

nv-ingest 26.1.1 removes the openai dependency, resolving the conflict with langchain-openai>=1.0.0 (which requires openai>=1.109.1). Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

github-actions Bot added enhancement New feature or request and removed enhancement New feature or request labels Jan 19, 2026

feat: enable mlx and mlx-vlm dependencies for langchain 1.0

e054b98

opencv-python 4.13+ now supports numpy>=2, resolving the conflict with langchain-aws>=1.0.0 (which requires numpy>=2.2 on Python 3.12+). Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

github-actions Bot added enhancement New feature or request and removed enhancement New feature or request labels Jan 19, 2026

Merge branch 'main' into feat/langchain-1.0

be46a6a

Update lfx integration deps to langchain 1.0 compatible versions. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ogabrielluiz and others added 4 commits February 19, 2026 17:06

Merge branch 'main' into feat/langchain-1.0

180b05d

[autofix.ci] apply automated fixes

a6c33e0

fix: update google dependency version to 0.4.0

78b4408

[autofix.ci] apply automated fixes

0070d13

codeflash-ai Bot mentioned this pull request Feb 19, 2026

⚡️ Speed up method LangFuseTracer.end_trace by 13% in PR #11114 (feat/langchain-1.0) #11832

Closed

ogabrielluiz and others added 5 commits March 9, 2026 14:41

fix: update langchain_core version to 1.2.17 in multiple starter proj…

de286a5

…ect JSON files

[autofix.ci] apply automated fixes

cba6e8c

[autofix.ci] apply automated fixes (attempt 2/3)

4e612e2

fix: update deprecated langchain imports to langchain_classic for 1.0…

b7360b0

… compatibility

jordanrfrazier approved these changes Mar 10, 2026

View reviewed changes

Comment thread src/backend/base/pyproject.toml

ogabrielluiz and others added 8 commits March 10, 2026 11:05

fix: align langchain-chroma version in optional chroma dependency group

e882ca6

fix: nightly now properly gets 1.9.0 branch (#12215)

8665ae1

before it was attempting to pull release-notes as letters are alphanumerically after numbers when we sort -V then grab tail now we only look at branch names that follow the pattern '^release-[0-9]+\.[0-9]+\.[0-9]+$'

docs: add search icon (#12216)

cacb54d

add-back-svg

Merge release-1.9.0 into feat/langchain-1.0

31a1cd2

[autofix.ci] apply automated fixes

5af20c6

[autofix.ci] apply automated fixes (attempt 2/3)

a5ddc26

Merge main into feat/langchain-1.0

b2dc29d

erichare approved these changes Mar 19, 2026

View reviewed changes

ogabrielluiz and others added 7 commits March 19, 2026 13:19

Merge branch 'release-1.9.0' into feat/langchain-1.0

228800d

Merge branch 'release-1.9.0' into feat/langchain-1.0

0a7b267

urllib parse module import bug

6872989

Update component_index.json

a82919a

[autofix.ci] apply automated fixes

6bcd9d1

chore: rebuild component index

e3e967d

[autofix.ci] apply automated fixes

d07ec19

severfire mentioned this pull request Apr 20, 2026

perf: Enhance Gunicorn preload functionality for Langflow #12778

Merged

This was referenced Apr 24, 2026

Qdrant component not respecting dimension of connected embedding model #12824

Closed

Uplift Langchain version > 1.0 #10734

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feat: add support for Langchain 1.0#11114

feat: add support for Langchain 1.0#11114
ogabrielluiz merged 66 commits into
release-1.9.0from
feat/langchain-1.0

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Summary

Previously Blocked Dependencies (All Resolved)

Other Notable Changes

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ogabrielluiz commented Dec 19, 2025 •

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