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Changelog

All notable changes to Agent Hypervisor will be documented in this file.

[2.0.0] — 2026-02-20

Added — Observability

  • Structured Event Bus (observability/event_bus.py) — append-only event store with typed events, pub/sub, and multi-index queries (by type, agent, session, time range)
  • Causal Trace IDs (observability/causal_trace.py) — distributed tracing with full spawn/delegation tree encoding (not just correlation IDs)

Added — Ring Improvements

  • Dynamic Ring Elevation (rings/elevation.py) — time-bounded privilege escalation (like sudo with TTL), auto-expiry, manual revocation
  • Ring Inheritance — child agents inherit parent ring - 1 (prevents privilege escalation via spawning)
  • Ring Breach Detector (rings/breach_detector.py) — sliding window anomaly scoring for ring call patterns, circuit breaker on HIGH/CRITICAL severity

Added — Liability Improvements

  • Fault Logging (liability/attribution.py) — Shapley-value inspired proportional fault scoring (replaces binary guilty/not-guilty)
  • Quarantine Manager (liability/quarantine.py) — read-only isolation before termination, forensic data preservation, auto-release with timeout
  • Persistent Liability Ledger (liability/ledger.py) — per-agent historical risk scoring, admission decisions (admit/probation/deny)

Added — Saga Improvements

  • Parallel Fan-Out (saga/fan_out.py) — concurrent branch execution with ALL_MUST_SUCCEED, MAJORITY_MUST_SUCCEED, ANY_MUST_SUCCEED policies
  • Execution Checkpoints (saga/checkpoint.py) — capture what goal was achieved (not just state), enabling partial replay without re-running completed effects
  • Declarative Saga DSL (saga/dsl.py) — define saga topology via dict/YAML with validation, fan-out support, and SagaStep conversion

Added — Session Improvements

  • Version Counters (session/vector_clock.py) — causal consistency enforcement, stale-write rejection, automatic merge on read
  • Resource Locks (session/intent_locks.py) — READ/WRITE/EXCLUSIVE lock declarations with contention detection and lock timeout prevention (wait-for graph)
  • Isolation Levels (session/isolation.py) — SNAPSHOT, READ_COMMITTED, SERIALIZABLE per saga (low-stakes sagas skip coordination cost)

Added — Security

  • Agent Rate Limiter (security/rate_limiter.py) — token bucket per agent per ring, configurable limits, automatic refill
  • Kill Switch (security/kill_switch.py) — graceful agent termination with in-flight saga step handoff to substitute agents

Changed

  • Package version bumped to 2.0.0
  • 58 public exports (up from 28)
  • 326 tests (up from 184)

[1.0.0] — 2026-02-20

Added

  • Core Hypervisor orchestrator with session lifecycle management
  • Shared Session Object (SSO) with VFS, snapshots, and consistency modes
  • 4-Ring Execution Model (Ring 0 Root → Ring 3 Sandbox) based on eff_score trust scores
  • Joint Liability Engine with sponsorship, bonding, and proportional penalty
  • Saga Orchestrator with step timeouts, retries, and reverse-order compensation
  • Audit-Logged Trail with delta capture, commitment engine, and ephemeral GC
  • Reversibility Registry for execute/undo API mapping with 4 reversibility levels
  • Transaction History Verifier for DID-based trust verification
  • Integration Adapters (Protocol-based, zero hard dependencies):
    • Nexus adapter — trust score resolution and caching
    • Verification adapter — behavioral drift detection with severity thresholds
    • IATP adapter — capability manifest parsing and trust hints
  • 184 tests (unit, integration, and scenario tests)
  • Performance benchmarks (268μs full pipeline)
  • Interactive demo (examples/demo.py) showcasing all 5 subsystems
  • Extracted from Agent OS as standalone package