orxhestra 0.0.3

Multi-Agent Orchestration Framework for Python

Multi-agent orchestration framework for Python.

Compose multi-agent AI systems with async event streaming, agent hierarchies, and built-in support for MCP and A2A protocols.

Quickstart

pip install orxhestra
# or
uv add orxhestra

from orxhestra import LlmAgent, Runner, InMemorySessionService

agent = LlmAgent(
    name="assistant",
    model="gpt-5.4",
    instructions="You are a helpful assistant.",
)

runner = Runner(agent=agent, session_service=InMemorySessionService())
response = await runner.run(user_id="user1", session_id="s1", new_message="Hello!")

for event in response:
    print(event.content)

[!TIP] For full documentation, guides, and API reference, visit orxhestra.com.

Features

• Agent ensemble - LLM, ReAct, Sequential, Parallel, and Loop agents
• Event streaming - Async event-driven architecture with real-time streaming
• Composer - Conduct entire agent orchestras declaratively with YAML
• Tools - Function tools, filesystem tools, agent-as-tool, shell, and long-running tool support
• Planners - Choreograph task execution with PlanReAct and TaskPlanner strategies
• Skills - Reusable, composable agent repertoires
• MCP - Model Context Protocol integration for tool servers
• A2A - Agent-to-Agent protocol for cross-service harmonization
• Memory - Pluggable memory stores for persistent agent context
• Tracing - Built-in support for Langfuse, LangSmith, and custom callbacks

Agents at a glance

Agent	Description
LlmAgent	Chat model agent with tools, instructions, and structured output
ReActAgent	Reasoning + acting loop with automatic tool use
SequentialAgent	Runs sub-agents in order
ParallelAgent	Runs sub-agents concurrently
LoopAgent	Repeats a sub-agent until exit condition
A2AAgent	Connects to remote agents via A2A protocol

Composer

Define entire agent orchestras in a single YAML file — no Python wiring needed. Compose LLM agents, loops, pipelines, tools, and review cycles declaratively. The example below builds a coding agent that plans, implements with filesystem + shell access, and self-reviews in a loop:

defaults:
  model:
    provider: openai
    name: gpt-5.4

tools:
  exit:
    builtin: "exit_loop"
  filesystem:
    builtin: "filesystem"
  shell:
    builtin: "shell"

agents:
  planner:
    type: llm
    description: "Plans the implementation steps for the coder agent."
    instructions: |
      Output a numbered list of concrete steps the coder
      should execute. Each step must be an actionable file
      operation or shell command.

  coder:
    type: llm
    description: "Implements code changes with filesystem and shell access."
    instructions: |
      Follow the plan from the previous step exactly.
      Use filesystem tools to create files and shell to
      run commands. Never ask the user to do anything.
    tools:
      - filesystem
      - shell

  reviewer:
    type: llm
    description: "Reviews changes and approves or requests fixes."
    instructions: |
      Check files exist and look correct. If done, call
      exit_loop. Otherwise describe what needs fixing.
    tools:
      - exit

  dev_loop:
    type: loop
    agents: [coder, reviewer]
    max_iterations: 10

  coordinator:
    type: sequential
    agents: [planner, dev_loop]

main_agent: coordinator

runner:
  app_name: coding-agent
  session_service: memory

orxhestra compose.yaml

Docker

docker run -e OPENAI_API_KEY=$OPENAI_API_KEY \
  -v ./compose.yaml:/app/compose.yaml \
  nicolaimtlassen/orxhestra

Documentation

• Getting Started - Installation and first agent
• Agents - Agent types and configuration
• Tools - Built-in and custom tools
• Composer - YAML-based agent composition
• Integrations - MCP and A2A setup

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Acknowledgments

This project is built on the shoulders of several outstanding open-source projects and research efforts:

• LangChain
• Google Agent Development Kit (ADK)
• LangGraph
• Model Context Protocol (MCP)
• Agent-to-Agent Protocol (A2A)

Special thanks to the open-source AI community for pushing the boundaries of what's possible with agent frameworks.