Fix/langgraph concurrent requests and tool name none - #1396
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ranst91 merged 5 commits intoApr 1, 2026
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When an agent is called as a tool, LangChain's ToolMessage.name is Optional and defaults to None. Passing it directly to ToolCallStartEvent causes a Pydantic validation error since tool_call_name must be a string. Fall back to event["name"] which always carries the tool name.
…oint LangGraphAgent stores per-request state in self.active_run, an instance variable mutated throughout each run(). Sharing one instance across concurrent requests causes state corruption and out-of-order STEP_STARTED/STEP_FINISHED events on the client. Add clone() to LangGraphAgent and call it per request in the endpoint helper so each request gets isolated state while sharing the compiled graph.
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Python Preview PackagesVersion
Install with uvAdd the TestPyPI index to your [[tool.uv.index]]
name = "testpypi"
url = "https://test.pypi.org/simple/"
explicit = trueThen install the packages you need: # Core SDK
uv add 'ag-ui-protocol==0.0.0.dev1775057640' --index testpypi
# Integrations (each already depends on the matching ag-ui-protocol preview)
uv add 'ag-ui-langgraph==0.0.0.dev1775057640' --index testpypi
uv add 'ag-ui-crewai==0.0.0.dev1775057640' --index testpypi
# NOTE: ag-ui-agent-spec depends on pyagentspec (git-only, not on PyPI).
# You will need to install pyagentspec separately from its git repo.
uv add 'ag-ui-agent-spec==0.0.0.dev1775057640' --index testpypi
uv add 'ag_ui_adk==0.0.0.dev1775057640' --index testpypi
uv add 'ag_ui_strands==0.0.0.dev1775057640' --index testpypiInstall with pippip install \
--index-url https://test.pypi.org/simple/ \
--extra-index-url https://pypi.org/simple/ \
ag-ui-protocol==0.0.0.dev1775057640
Commit: bcebf4a |
@ag-ui/a2a-middleware
@ag-ui/a2ui-middleware
@ag-ui/mcp-apps-middleware
@ag-ui/middleware-starter
@ag-ui/a2a
@ag-ui/adk
@ag-ui/ag2
@ag-ui/agno
@ag-ui/aws-strands
@ag-ui/claude-agent-sdk
@ag-ui/crewai
@ag-ui/langchain
@ag-ui/langgraph
@ag-ui/langroid
@ag-ui/llamaindex
@ag-ui/mastra
@ag-ui/pydantic-ai
@ag-ui/server-starter
@ag-ui/server-starter-all-features
@ag-ui/vercel-ai-sdk
create-ag-ui-app
@ag-ui/client
@ag-ui/core
@ag-ui/encoder
@ag-ui/proto
commit: |
tylerslaton
approved these changes
Apr 1, 2026
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Fixes CopilotKit/CopilotKit#3552