feat(third_party): add AG2 multi-agent framework integration

[faridun-ag2]

Summary

• Add AG2 (formerly AutoGen) as a third-party integration with three notebooks demonstrating multi-agent patterns with Claude
• AG2 is an open-source multi-agent framework with 500K+ monthly PyPI downloads and 4,300+ GitHub stars
• All notebooks tested and executed with outputs preserved

Notebooks

1. Basic_Multi_Agent_Chat — Two-agent conversation with Claude using AssistantAgent and UserProxyAgent
2. Tool_Use_With_Agents — Function calling with AG2's decorator-based tool registration
3. GroupChat_Orchestration — Multiple specialized Claude agents (Researcher, Writer, Reviewer) collaborating in a managed GroupChat

Test plan

• All three notebooks execute top-to-bottom without errors via jupyter nbconvert --execute
• uv run python scripts/validate_notebooks.py passes
• uv run ruff check and uv run ruff format --check clean
• uv run python scripts/validate_authors_sorted.py passes
• Registry entries and author entry added

[faridun-ag2]

Hi @PedramNavid @montanalow 👋

Would appreciate your review on this PR — it adds AG2 (formerly AutoGen) as a third-party integration with three notebooks covering multi-agent patterns with Claude.

Thanks!

[nidhishgajjar]

Orb Code Review (powered by GLM 5.1 on Orb Cloud)

New third-party cookbook: AG2 (formerly AutoGen) multi-agent framework integration with Claude — three notebooks covering basic chat, tool use, and GroupChat orchestration.

Observations

1. Comprehensive coverage (Positive)
Three notebooks that progressively build complexity:

• Basic two-agent conversation
• Tool use with decorator-based registration
• GroupChat with multiple specialized agents

2. Output includes error in first cell (Medium)

"text": ["/Users/faridunm/Documents/WORK/AG2/Opensource/claude-cookbooks/.venv/bin/python: No module named pip
"]

The first notebook's output cell shows a No module named pip error. While this doesn't affect functionality, it suggests the notebook was tested in an environment where pip wasn't available in the venv. Consider clearing this output before merge.

3. Full file path in output (Low)
The error reveals the author's local path (/Users/faridunm/...). Clear outputs before merging to avoid leaking local paths.

4. Good configuration examples (Positive)
The notebooks show proper AG2 config list setup for Anthropic:

config_list = [{"model": "claude-sonnet-4-6", "api_key": os.environ.get("ANTHROPIC_API_KEY")}]

5. README.md missing (Note)
Other third-party directories (Dewey, SimpleFunctions) include a README.md. The AG2 directory doesn't have one. Consider adding for consistency.

Summary

Solid multi-notebook integration. Clean the error output from the first notebook and consider adding a README for consistency.

Assessment: approve (with minor cleanup suggestions)