Release 0.12.6

[github-actions]

Release readiness review (v0.12.5 -> TARGET 1619d46)

This is a release readiness report done by $final-release-review skill.

Diff

v0.12.5...1619d46

Release call:

🟢 GREEN LIGHT TO SHIP No concrete release-blocking regressions or breaking-versioning issues were found in v0.12.5...1619d465.

Scope summary:

• 49 files changed (+1352/-538); key areas touched: memory/session concurrency (src/agents/extensions/memory, src/agents/memory), MCP HTTP session handling (src/agents/mcp), tool execution concurrency (src/agents/run_internal), realtime defaults (src/agents/realtime), tests (notably tests/extensions/memory, tests/mcp, tests/realtime), docs/translations, and version bump to 0.12.6.

Risk assessment (ordered by impact):

1. Realtime default model switched to gpt-realtime-1.5

• Risk: 🟡 MODERATE. This is an intentional user-visible behavior change for callers relying on implicit realtime model defaults.
• Evidence: src/agents/realtime/openai_realtime.py introduces DEFAULT_REALTIME_MODEL = "gpt-realtime-1.5" and replaces prior "gpt-realtime" default; docs and tests were updated (docs/realtime/*.md, README.md, tests/realtime/test_openai_realtime.py).
• Files: src/agents/realtime/openai_realtime.py, tests/realtime/test_openai_realtime.py, docs/realtime/guide.md, docs/realtime/quickstart.md, README.md
• Action: Ensure release notes explicitly call out the default-model change; pass condition is an explicit upgrade note present in release notes/changelog.

2. High-concurrency SQLAlchemy session initialization path changed

• Risk: 🟢 LOW. Concurrency-sensitive code was substantially modified, but the diff adds broad regression coverage for first-write races, cross-loop usage, and cancellation behavior.
• Evidence: SQLAlchemySession now uses class-level per-table/threading locks and IntegrityError handling around parent-row creation; large targeted test expansion in tests/extensions/memory/test_sqlalchemy_session.py.
• Files: src/agents/extensions/memory/sqlalchemy_session.py, tests/extensions/memory/test_sqlalchemy_session.py
• Action: Run targeted memory concurrency tests; pass condition is green for uv run pytest -q tests/extensions/memory/test_sqlalchemy_session.py -k "concurrent or cancelled_waiter".

3. Function tool batch executor task-state race fix

• Risk: 🟢 LOW. Internal async task wiring changed to stabilize eager-task-factory behavior, and a dedicated regression test was added.
• Evidence: tool_execution.py now binds task_state before task creation and threads it through invoke/post-invoke flow; regression test added in tests/test_run_step_execution.py for eager task factory.
• Files: src/agents/run_internal/tool_execution.py, tests/test_run_step_execution.py
• Action: Run targeted executor regression test; pass condition is green for uv run pytest -q tests/test_run_step_execution.py -k eager_task_factory_tracks_state_safely.

Notes:

• Base tag was selected using local tags only (git tag -l 'v*' --sort=-v:refname | head -n1 → v0.12.5), per request.
• Target was current HEAD (1619d46505808f1607110f8740a9ed4f8b5bd7f4).
• Working tree is clean.
• Assumed CI verification coverage for this release candidate; no additional local verification suite was executed in this review.

[seratch]

Due to #2737, the next release will be 0.13