[Release] openai/openai-agents-python v0.12.3: v0.12.3

OpenAI Agents Python v0.12.3 release includes two critical bug fixes: handling inner MCP tool cancellations as tool errors and serializing streamable-HTTP MCP requests per session. The release also includes documentation updates and minor typo corrections. Two new contributors joined the project with their first contributions.

Key Points

• •Fixed inner MCP tool cancellations to be properly handled as tool errors instead of unhandled exceptions
• •Resolved streamable-HTTP MCP request serialization issues by implementing per-session serialization
• •Updated translated documentation pages to maintain consistency across language versions
• •Corrected minor typos in provider comments and test naming conventions
• •Welcomed new contributors @luojiyin1987 and @elainegan-openai to the project
• •Maintained backward compatibility while improving error handling and request management
• •Focus on MCP (Model Context Protocol) tool reliability and session management improvements

Concepts