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

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