René's URL Explorer Experiment


Title: Changelog - Docs by LangChain

Open Graph Title: Changelog - Docs by LangChain

X Title: Changelog - Docs by LangChain

Description: Log of updates and improvements to our Python packages

Open Graph Description: Log of updates and improvements to our Python packages

X Description: Log of updates and improvements to our Python packages

Opengraph URL: https://docs.langchain.com/oss/python/releases/changelog

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Links:

/llms.txthttps://docs.langchain.com/llms.txt
Skip to main contenthttps://docs.langchain.com/oss/python/releases/changelog#content-area
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Errorshttps://docs.langchain.com/oss/python/common-errors
Versioninghttps://docs.langchain.com/oss/python/versioning
Changeloghttps://docs.langchain.com/oss/python/releases/changelog
Release policyhttps://docs.langchain.com/oss/python/release-policy
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​https://docs.langchain.com/oss/python/releases/changelog#oct-22-2026
​https://docs.langchain.com/oss/python/releases/changelog#langchain-core-v1-7-0
event streaminghttps://docs.langchain.com/oss/python/langchain/event-streaming
​https://docs.langchain.com/oss/python/releases/changelog#upgrade-clients-before-the-server
Agent Serverhttps://docs.langchain.com/langsmith/agent-server
​https://docs.langchain.com/oss/python/releases/changelog#breaking-changes
​https://docs.langchain.com/oss/python/releases/changelog#oct-14-2026
​https://docs.langchain.com/oss/python/releases/changelog#langchain-v1-4-6
​https://docs.langchain.com/oss/python/releases/changelog#features
Read the response schemahttps://docs.langchain.com/oss/python/langchain/human-in-the-loop#read-the-response-schema
Correct an invalid answerhttps://docs.langchain.com/oss/python/langchain/human-in-the-loop#correct-an-invalid-answer
Pause once per tool callhttps://docs.langchain.com/oss/python/langchain/human-in-the-loop#pause-once-per-tool-call
human-in-the-loop overviewhttps://docs.langchain.com/oss/python/concepts/human-in-the-loop
​https://docs.langchain.com/oss/python/releases/changelog#sep-1-2026
​https://docs.langchain.com/oss/python/releases/changelog#langchain-v1-4-0
FastMCPhttps://gofastmcp.com
​https://docs.langchain.com/oss/python/releases/changelog#features-2
multiple servershttps://docs.langchain.com/oss/python/langchain/mcp/connections#multiple-servers
MCP overviewhttps://docs.langchain.com/oss/python/langchain/mcp
Elicitationhttps://docs.langchain.com/oss/python/langchain/mcp/tools#elicitation
per-user authenticationhttps://docs.langchain.com/oss/python/langchain/mcp/auth#per-user-authentication
Authenticationhttps://docs.langchain.com/oss/python/langchain/mcp/auth
gating destructive tools behind approvalhttps://docs.langchain.com/oss/python/langchain/mcp/tools#human-in-the-loop
Tool metadatahttps://docs.langchain.com/oss/python/langchain/mcp/tools#tool-metadata
​https://docs.langchain.com/oss/python/releases/changelog#migrating
migration guidehttps://docs.langchain.com/oss/python/migrate/langchain-mcp-adapters
​https://docs.langchain.com/oss/python/releases/changelog#jul-24-2026
​https://docs.langchain.com/oss/python/releases/changelog#deepagents-v0-7-0
revamped evaluation suitehttps://www.langchain.com/blog/how-we-benchmark-deep-agents
​https://docs.langchain.com/oss/python/releases/changelog#optimizations
#4859https://github.com/langchain-ai/deepagents/pull/4859
#4979https://github.com/langchain-ai/deepagents/pull/4979
#5009https://github.com/langchain-ai/deepagents/pull/5009
​https://docs.langchain.com/oss/python/releases/changelog#features-3
Override a default middleware instancehttps://docs.langchain.com/oss/python/deepagents/customization#middleware
#4251https://github.com/langchain-ai/deepagents/pull/4251
deletehttps://docs.langchain.com/oss/python/deepagents/tools#built-in-harness-tools
#3659https://github.com/langchain-ai/deepagents/pull/3659
#3851https://github.com/langchain-ai/deepagents/pull/3851
#4109https://github.com/langchain-ai/deepagents/pull/4109
tool allowlisthttps://docs.langchain.com/oss/python/deepagents/overview#virtual-filesystem-access
#4325https://github.com/langchain-ai/deepagents/pull/4325
#4698https://github.com/langchain-ai/deepagents/pull/4698
#4540https://github.com/langchain-ai/deepagents/pull/4540
#4063https://github.com/langchain-ai/deepagents/pull/4063
#4570https://github.com/langchain-ai/deepagents/pull/4570
#4706https://github.com/langchain-ai/deepagents/pull/4706
#4108https://github.com/langchain-ai/deepagents/issues/4108
#4598https://github.com/langchain-ai/deepagents/pull/4598
#4192https://github.com/langchain-ai/deepagents/pull/4192
#4455https://github.com/langchain-ai/deepagents/pull/4455
​https://docs.langchain.com/oss/python/releases/changelog#breaking-changes-2
#4929https://github.com/langchain-ai/deepagents/pull/4929
#4541https://github.com/langchain-ai/deepagents/pull/4541
#4561https://github.com/langchain-ai/deepagents/pull/4561
​https://docs.langchain.com/oss/python/releases/changelog#may-12-2026
​https://docs.langchain.com/oss/python/releases/changelog#deepagents-v0-6-0
CodeInterpreterMiddlewarehttps://docs.langchain.com/oss/python/deepagents/interpreters
event streaminghttps://docs.langchain.com/oss/python/deepagents/event-streaming
DeltaChannelhttps://docs.langchain.com/oss/python/langgraph/pregel#deltachannel
bloghttps://www.langchain.com/blog/delta-channels-evolving-agent-runtime
delta-channel-dump recovery scripthttps://github.com/langchain-ai/langgraph/tree/main/examples/delta-channel-dump
Version compatibility and channel changeshttps://docs.langchain.com/oss/python/langgraph/pregel#version-compatibility-and-rollbacks
Harness profileshttps://docs.langchain.com/oss/python/deepagents/profiles
ContextHubBackendhttps://docs.langchain.com/oss/python/deepagents/backends#contexthubbackend
bloghttps://www.langchain.com/blog/introducing-context-hub
​https://docs.langchain.com/oss/python/releases/changelog#may-12-2026-2
​https://docs.langchain.com/oss/python/releases/changelog#langchain-v1-3-0
event streaminghttps://docs.langchain.com/oss/python/langchain/event-streaming
​https://docs.langchain.com/oss/python/releases/changelog#may-12-2026-3
​https://docs.langchain.com/oss/python/releases/changelog#langgraph-v1-2-0
DeltaChannelhttps://docs.langchain.com/oss/python/langgraph/pregel#deltachannel
Per-node timeoutshttps://docs.langchain.com/oss/python/langgraph/fault-tolerance#timeouts
add_nodehttps://reference.langchain.com/python/langgraph/graph/state/StateGraph/add_node
TimeoutPolicyhttps://reference.langchain.com/python/langgraph/types/TimeoutPolicy
NodeTimeoutErrorhttps://reference.langchain.com/python/langgraph/errors/NodeTimeoutError
Node-level error handlershttps://docs.langchain.com/oss/python/langgraph/fault-tolerance#error-handling
add_nodehttps://reference.langchain.com/python/langgraph/graph/state/StateGraph/add_node
NodeErrorhttps://reference.langchain.com/python/langgraph/errors/NodeError
Commandhttps://reference.langchain.com/python/langgraph/types/Command
Graceful shutdownhttps://docs.langchain.com/oss/python/langgraph/fault-tolerance#graceful-shutdown
RunControlhttps://reference.langchain.com/python/langgraph/runtime/RunControl
​https://docs.langchain.com/oss/python/releases/changelog#apr-7-2026
​https://docs.langchain.com/oss/python/releases/changelog#deepagents-v0-5-0
Async subagentshttps://docs.langchain.com/oss/python/deepagents/async-subagents
LangSmith Deploymenthttps://docs.langchain.com/langsmith/deployment
backend protocolhttps://github.com/langchain-ai/deepagents/blob/main/libs/deepagents/deepagents/backends/protocol.py
State and Store backendshttps://docs.langchain.com/oss/python/deepagents/backends
​https://docs.langchain.com/oss/python/releases/changelog#mar-10-2026
​https://docs.langchain.com/oss/python/releases/changelog#langgraph-v1-1-0
streaming docshttps://docs.langchain.com/oss/python/langgraph/streaming#stream-output-format-v2
invoke docshttps://docs.langchain.com/oss/python/langgraph/streaming#v2-invoke-format
​https://docs.langchain.com/oss/python/releases/changelog#feb-10-2026
​https://docs.langchain.com/oss/python/releases/changelog#deepagents-v0-4-0
langchain-modalhttps://pypi.org/project/langchain-modal/
langchain-daytonahttps://pypi.org/project/langchain-daytona/
langchain-runloophttps://pypi.org/project/langchain-runloop/
sandboxes guidehttps://docs.langchain.com/oss/python/deepagents/sandboxes
data analysis tutorialhttps://docs.langchain.com/oss/python/deepagents/data-analysis
conversation history summarizationhttps://docs.langchain.com/oss/python/deepagents/context-engineering#summarization
ContextOverflowErrorhttps://reference.langchain.com/python/langchain-core/exceptions/ContextOverflowError
​https://docs.langchain.com/oss/python/releases/changelog#dec-15-2025
​https://docs.langchain.com/oss/python/releases/changelog#langchain-v1-2-0
create_agenthttps://docs.langchain.com/oss/python/langchain/agents
extrashttps://reference.langchain.com/python/langchain/tools
toolshttps://docs.langchain.com/oss/python/langchain/tools
programmatic tool callinghttps://docs.langchain.com/oss/python/integrations/chat/anthropic#programmatic-tool-calling
tool searchhttps://docs.langchain.com/oss/python/integrations/chat/anthropic#tool-search
Anthropichttps://docs.langchain.com/oss/python/integrations/chat/anthropic#built-in-tools
OpenAIhttps://docs.langchain.com/oss/python/integrations/chat/openai#responses-api
ProviderStrategyhttps://docs.langchain.com/oss/python/langchain/structured-output#provider-strategy
​https://docs.langchain.com/oss/python/releases/changelog#dec-8-2025
​https://docs.langchain.com/oss/python/releases/changelog#langchain-google-genai-v4-0-0
release notes and migration guidehttps://github.com/langchain-ai/langchain-google/discussions/1422
​https://docs.langchain.com/oss/python/releases/changelog#nov-25-2025
​https://docs.langchain.com/oss/python/releases/changelog#langchain-v1-1-0
Model profileshttps://docs.langchain.com/oss/python/langchain/models#model-profiles
models.devhttps://models.dev
Summarization middlewarehttps://docs.langchain.com/oss/python/langchain/middleware/built-in#summarization
Structured outputhttps://docs.langchain.com/oss/python/langchain/structured-output
SystemMessage for create_agenthttps://docs.langchain.com/oss/python/langchain/middleware/custom#dynamic-prompt
Model retry middlewarehttps://docs.langchain.com/oss/python/langchain/middleware/built-in#model-retry
Content moderation middlewarehttps://docs.langchain.com/oss/python/integrations/middleware/openai#content-moderation
​https://docs.langchain.com/oss/python/releases/changelog#oct-20-2025
​https://docs.langchain.com/oss/python/releases/changelog#v1-0-0
​https://docs.langchain.com/oss/python/releases/changelog#langchain
Release noteshttps://docs.langchain.com/oss/python/releases/langchain-v1
Migration guidehttps://docs.langchain.com/oss/python/migrate/langchain-v1
​https://docs.langchain.com/oss/python/releases/changelog#langgraph
Release noteshttps://docs.langchain.com/oss/python/releases/langgraph-v1
Migration guidehttps://docs.langchain.com/oss/python/migrate/langgraph-v1
open an issuehttps://github.com/langchain-ai/docs/issues/new?template=01-langchain.yml
go to the archived contenthttps://github.com/langchain-ai/langchain/tree/v0.3/docs/docs
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file an issuehttps://github.com/langchain-ai/docs/issues/new/choose
VersioningPrevioushttps://docs.langchain.com/oss/python/versioning
What's new in LangChain v1Nexthttps://docs.langchain.com/oss/python/releases/langchain-v1
Docs by LangChain home pagehttps://docs.langchain.com/
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