FIXES.md

Fixes Applied

Import Path Update (2025-01-27)

Issue: ModuleNotFoundError: No module named 'langchain.schema'

Root Cause: LangChain reorganized imports in v0.3+. The langchain.schema module was moved to langchain_core.messages.

Fix Applied:

• Updated all workflow files to use from langchain_core.messages import HumanMessage, SystemMessage
• Added langchain-core>=0.3.0 to dependencies in pyproject.toml

Files Modified:

• src/amber/workflows/on_demand.py
• src/amber/workflows/background.py
• src/amber/workflows/scheduled.py
• src/amber/workflows/webhook.py
• pyproject.toml

Python Version Constraint (2025-01-27)

Issue: Pydantic v1 compatibility warning with Python 3.14

Root Cause: LangChain dependencies use Pydantic v1 which isn't fully compatible with Python 3.14+

Fix Applied:

• Added Python version constraint: requires-python = ">=3.11,<3.14"
• This ensures installation on Python 3.11, 3.12, or 3.13

Files Modified:

• pyproject.toml

Testing After Fixes

# Reinstall dependencies
pip install -e .

# Test service starts without errors
python -m amber.service

Expected output:

{"event": "Starting Amber LangGraph service", ...}
{"event": "PostgreSQL checkpointer initialized", ...}
{"event": "Supervisor graph compiled", ...}

Service should start on http://localhost:8000