Release 0.23.0

v0.23.0 Release Notes

This release focuses on reliability and correctness improvements: hardening the event/op contract, fixing schema composition edge cases, and eliminating performance hazards in the session journal.

Bug Fixes

Cyclic Journal Protection

The session journal's Fold operation could hang indefinitely if a cycle existed in the journal chain. chainFromHead is now bounded, preventing infinite loops in malformed or corrupted journal state.

Schema Composition Fix

Resolved an issue with schema composition (PR #133) that could produce incorrect or invalid schemas in certain edge cases.

Contract Hardening

Several correctness issues in the core Event/Op contract were addressed:

• Fixed announce/envelope handling
• Added a proper context-overflow error type
• Corrected ACP decode behavior
• Removed a dead diagnostics field that was causing confusion
• Improved MCP schema fidelity to better match the expected wire format

Improvements

Journal Performance — No-Copy Cost & LastUsage Derivation

Journal.Cost and Journal.LastUsage no longer allocate journal-sized copies when computing their results. Additionally, LastUsage's internal walk is now bounded, preventing unbounded traversal on large or pathological journals. This reduces memory pressure in agents with long-running sessions.

Commits

• Merge pull request #131 from jedwards1230/integration/contract-hardening (c702c40)
• Merge pull request #133 from jedwards1230/fix/119-schema-composition (a752b43)
• Merge pull request #121 from jedwards1230/perf/journal-no-copy (0ad5537)

Full Changelog: v0.22.0...v0.23.0