omnibase_core 0.39.0

ONEX Core Framework - Base classes and essential implementations

omnibase_core

Contract-driven execution layer for agent tools and workflows.

Install

uv add omnibase_core

Minimal Example

Every ONEX node starts as a contract-driven declaration with zero custom code:

from omnibase_core.nodes import NodeCompute

class NodeMyFeature(NodeCompute):
    pass  # All behavior driven by contract YAML

The contract YAML defines inputs, outputs, state transitions, and configuration:

name: node_my_feature
version: 1.0.0
type: COMPUTE
input_schema: MyInput
output_schema: MyOutput

When you need custom logic, opt in by overriding process():

class NodeMyFeature(NodeCompute):
    async def process(self, input_data):
        # Custom logic here
        return {"result": input_data.value * 2}

Why ONEX

Problem	ONEX Solution
Inconsistent tool I/O	Typed schemas (Pydantic + protocols)
Implicit state	Deterministic lifecycle with contract FSMs
Opaque failures	Structured errors with ModelOnexError
Framework lock-in	Framework-agnostic protocol design
Untestable tools	Pure nodes with injected dependencies

Key Features

• Four-node architecture: EFFECT (I/O), COMPUTE (transform), REDUCER (aggregate), ORCHESTRATOR (coordinate) -- details
• Contract-driven execution: YAML contracts define behavior; code is opt-in
• Protocol-driven DI: ModelONEXContainer for dependency injection
• Structured errors: ModelOnexError with proper error codes and traceability
• Event system: ModelEventEnvelope for event-driven communication
• 40+ mixins: Reusable behavior modules for common patterns
• Subcontracts: Declarative configuration for FSM, caching, routing, and more
• 12,000+ tests: Comprehensive test suite with strict type checking

Documentation

• Node Building Guide -- start here
• Architecture Overview
• Four-Node Architecture
• Subcontract Architecture
• Complete Documentation Index
• CLAUDE.md -- developer context and conventions

License

MIT