LangGraph Upgrade to Fix tools_condition Import

[StamKavid]

Issue Description

The application is encountering an import error when trying to use tools_condition from langgraph.prebuilt:

ImportError: cannot import name 'tools_condition' from 'langgraph.prebuilt' (unknown location)

Root Cause

The tools_condition function was introduced in LangGraph version 0.6.x, but the current dependency constraint allows for older versions that don't include this function.

Current State

• Current dependency: langgraph>=0.2.70 (in pyproject.toml)
• Required version: langgraph>=0.6.3
• Error location: Import statements using from langgraph.prebuilt import tools_condition

Solution

Update the LangGraph dependency version constraint in pyproject.toml:

# Before
langgraph>=0.2.70

# After  
langgraph>=0.6.3

Steps to Implement

• Update pyproject.toml with new version constraint
• Run uv lock to update the lock file
• Run uv sync to install the updated packages
• Test that tools_condition can be imported successfully
• Verify all existing LangGraph functionality still works
• Update any code that might be affected by API changes

Testing Checklist

• Import test: from langgraph.prebuilt import tools_condition
• Backend starts without import errors
• All existing LangGraph workflows continue to function
• Docker build succeeds with new dependencies

Files to Modify

• philoagents-api/pyproject.toml (line 13)

Migration Notes

LangGraph 0.6.x may include breaking changes. Review the LangGraph changelog for any API changes that might affect existing code.

Related Issues

• Dependency management
• Import errors
• Backend startup failures

Priority

High - This blocks the application from starting correctly.

[ag-mout]

Hi @StamKavid!

I found a workaround by launching the langgraph dev with uv run, like this:

uv run --with "langgraph-cli[inmem]==0.1.70" langgraph dev

This will install the required package version without updating the other langgraph packages, causing dependency issues.

Then you can open it using the link provided in the CLI:
https://smith.langchain.com/studio/?baseUrl=http://127.0.0.1:2024