[bot] Support AgentScope 2.0 integration APIs

[AbhiPrasad]

Summary

The weekly dependency update PR #478 bumped the latest AgentScope matrix pin from agentscope==1.0.20 to agentscope==2.0.0. The current Braintrust AgentScope integration tests no longer run against 2.0.0 because several AgentScope APIs used by our integration tests and auto-instrumentation smoke script were removed or moved.

For PR #478, we restored the existing agentscope latest cassettes rather than committing a broken or partial re-record. This issue tracks adding explicit support for AgentScope 2.0.

Reproduction

On PR #478 / branch deps/weekly-update-2026-06-01, run:

cd py
nox -s "test_agentscope(latest)" -- --vcr-record=all

Observed with agentscope==2.0.0:

ImportError: cannot import name 'ReActAgent' from 'agentscope.agent'
ModuleNotFoundError: No module named 'agentscope.pipeline'
ImportError: cannot import name 'execute_python_code' from 'agentscope.tool'
ImportError: cannot import name 'AgentBase' from 'agentscope.agent'

Affected test/script locations:

• py/src/braintrust/integrations/agentscope/test_agentscope.py
  • _make_agent() imports ReActAgent from agentscope.agent
  • sequential pipeline test imports sequential_pipeline from agentscope.pipeline
  • tool-use test imports Toolkit / execute_python_code from agentscope.tool
• py/src/braintrust/integrations/auto_test_scripts/test_auto_agentscope.py
  • imports AgentBase and ReActAgent from agentscope.agent

Investigation plan

1. Review the AgentScope 2.0 migration guide / changelog and identify replacements for:

   • agentscope.agent.AgentBase
   • agentscope.agent.ReActAgent
   • agentscope.pipeline.sequential_pipeline
   • agentscope.tool.execute_python_code

2. Inspect AgentScope 2.0 package structure locally, e.g.:

   cd py
   nox -s "test_agentscope(latest)" -- --disable-vcr -k non_vcr_or_import_probe
   # or use the nox-created env / a scratch env to inspect:
   python - <<'PY'
   import agentscope, pkgutil
   print(agentscope.__version__)
   print([m.name for m in pkgutil.iter_modules(agentscope.__path__)])
   PY

3. Decide whether the Braintrust integration needs version-gated code paths:

   • keep AgentScope 1.x behavior working for the existing 1.0.0 matrix entry
   • add AgentScope 2.x wrappers / instrumentation paths where APIs have changed

4. Update tests to cover both versions in the nox matrix:

   • keep existing 1.x cassettes
   • re-record py/src/braintrust/integrations/agentscope/cassettes/latest/ once 2.0 support is implemented

5. Verify:

   cd py
   nox -s "test_agentscope(latest)"
   nox -s "test_agentscope(1.0.0)"

Notes

This is a major dependency bump (1.0.20 -> 2.0.0), so API breakage is expected. The immediate failure is at import time before cassette playback/recording can meaningfully validate provider response shape.