kollabor-events 0.5.18

Event bus and hook system for Kollabor

kollabor-events

kollabor-events is Kollabor's event bus and hook foundation.

It provides the shared event models, hook registry, hook executor, event processor, permission models, ready-message aggregation, and small utility helpers used by the CLI, plugins, engine, agent runtime, and TUI.

Current Role

• Register and execute hooks for core and plugin-defined event types.
• Order hook execution by priority and preserve hook status/error metadata.
• Provide event, command, permission, and conversation data models.
• Store cross-package services on the event bus for loose coupling.
• Provide utility helpers for safe execution and nested dict access.

Architecture

Module	Responsibility
bus.py	EventBus, service registry, hook registration, event emission
models.py	event types, hooks, command definitions, UI models
registry.py	hook storage and enable/disable/status lookup
executor.py	hook execution, timeout/retry/error behavior
processor.py	event phase mapping and ordered processing
hook_adapter.py	sync/async hook compatibility
permissions_models.py / permissions_config.py	approval and risk models
data_models.py	conversation/session metadata models
ready_message.py	startup/ready message collection
dict_utils.py / error_utils.py	safe utility helpers

Hook Priorities

Priority	Value	Purpose
SYSTEM	1000	core lifecycle/system hooks
SECURITY	900	permission and policy hooks
PREPROCESSING	500	input/request transforms
LLM	100	LLM orchestration hooks
POSTPROCESSING	50	response/result transforms
DISPLAY	10	display/UI hooks

Usage

from kollabor_events import EventBus, EventType, Hook, HookPriority

bus = EventBus()


async def on_tool_pre(data, event):
    data["checked"] = True
    return data


await bus.register_hook(Hook(
    plugin_name="example",
    name="check_tool",
    event_type=EventType.TOOL_CALL_PRE,
    priority=HookPriority.SECURITY.value,
    callback=on_tool_pre,
))

result = await bus.emit_with_hooks(
    EventType.TOOL_CALL_PRE,
    {"tool_data": {"type": "terminal"}},
    source="example",
)

Known Gaps

• The event model is broad and shared across many packages; event ownership and schema expectations should be documented closer to each event type.
• String-based custom events are supported, but typed contracts are stronger for core events.
• Hook error/timeout behavior is configurable, so callers should test important security and lifecycle hooks under failure conditions.

Roadmap

Phase 1: Event contract docs

• Document core event payload schemas and expected mutation behavior.
• Add examples for common hook categories: security, display, LLM, and plugins.
• Link event types to the package that owns their primary behavior.

Phase 2: Safer extension points

• Add optional typed payload helpers for high-risk events.
• Expand tests for cancellation, timeout, retry, and hook ordering behavior.
• Make plugin-defined event naming conventions explicit.

Phase 3: Observability

• Improve hook status snapshots for diagnostics and UI display.
• Add structured hook execution traces for debugging event-heavy flows.

Development

Targeted validation examples:

python -m py_compile packages/kollabor-events/src/kollabor_events/*.py
python -m pytest tests/unit/test_hub_native_param_compat.py -q

Dependencies

None. This package is intentionally stdlib-only.

License

MIT