June 2026 monthly summary for docker/cagent focused on reliability and observability of sub-session workflows. Delivered Sub-session Transcript Persistence and Error Handling, ensuring transcripts are persisted and debugging information is preserved when sub-sessions encounter errors. This prevents transcripts from being dropped mid-stream and guarantees that parent records capture the complete sub-session activity for auditing and debugging. Key achievements: - Implemented unconditional persistence of sub-session data on error paths for both forward and background agent flows (runForwarding and runCollecting), so transcripts are recorded even when errors occur. Commits include 86ce1eddefd101cf3b6f1813e42fe92973b8cb0f and 4bac1e60ad84a31a34de855178d398ebcc563dd7. - Fixed error-path handling to ensure SubSession events and transcripts are emitted and stored, eliminating silent data loss and improving parent session visibility. - Added targeted tests (e.g., TestTransferTaskPersistsSubSessionOnError and TestRunAgentPersistsSubSessionOnError) to validate persistence behavior under failure conditions. - Completed cross-path consistency: parent tool results now reflect actual sub-agent work, improving observability and post-mortem clarity. Overall impact and accomplishments: - Significantly improved reliability of multi-agent sessions and debuggability; reduced time to diagnose failures and improved auditability of session histories. - Business value realized through fewer data gaps, better-root-cause analysis, and stronger confidence in automated workflows. Technologies/skills demonstrated: - Go runtime changes, concurrency and channel handling, and event-driven persistence patterns (PersistenceObserver). - Testing with mocks to validate error-path behavior and data retention across sub-sessions. - Observability improvements enabling richer session analytics and operational insights.