Hollow

v0.7.0: Event Kernel

What's new

EventBus (agents/events.py) — the foundational OS primitive for v0.7.0+

• Agents subscribe to glob-pattern event streams: task.*, agent.terminated, *
• 27 canonical event types spanning task lifecycle, agent lifecycle, budget, file I/O, memory, and signals
• Append-only event log (memory/event-log.json) — full audit trail, survives restarts
• TTL subscriptions: events stop delivering after expiry, subscriptions auto-removed
• Deadlock-safe: all emitters collect payloads inside their locks, emit outside
• Recursion-safe: _deliver_event bypasses send() to prevent message.received loops

Events emitted by subsystem

| Subsystem | Events |
|---|---|
| Scheduler | task.queued, task.started, task.completed, task.failed |
| Registry | agent.registered, agent.terminated, agent.suspended, agent.resumed, budget.warning, budget.exhausted |
| MessageBus | message.received |
| MemoryManager | decision.resolved, spec.activated |
| Server | file.written |

New API endpoints

• POST /events/subscribe — subscribe with glob pattern + optional TTL
• DELETE /events/subscriptions/{id} — cancel subscription
• GET /events/history — query log by time range and event type
• GET /events/subscriptions — list active subscriptions for caller

New MCP tools (48 total)

event_subscribe, event_unsubscribe, event_history

Bug fix

Token field mapping: Ollama returns tokens_prompt/tokens_response/total_duration_ms — scheduler was reading tokens_in/tokens_out/ms (all null since v0.6.0). Budget tracking and usage reporting now work correctly.

Tests

13 new integration tests in tests/integration/test_events.py — all real API, real Ollama inference, zero mocks. ~17.5s total runtime.