marona 0.5.2

Unified AI runtime and MCP/Skill gateway for online, hybrid, and offline applications.

marona

Unified AI runtime and MCP/Skill gateway for Python.

pip install marona

Marona has three request concepts:

• mode: where execution is allowed: online, hybrid, or offline.
• model: the model handling this request.
• input: the user's text, image, document, or mixed request.

Apps, Skills, discovery, identity, permissions, approvals, service connections, and MCP execution stay inside the same Marona runtime.

1. Configure Access

MARONA_API_KEY authenticates your application with Marona.

export MARONA_API_KEY="mrn_live_..."
export OPENAI_API_KEY="..."          # Only for openai/...
export ANTHROPIC_API_KEY="..."       # Only for anthropic/...
export GEMINI_API_KEY="..."          # Only for gemini/...
export LITELLM_API_BASE="https://llm.example.com"
export LITELLM_API_KEY="..."
export OLLAMA_API_BASE="http://127.0.0.1:11434"

2. Send A Request

import asyncio
import os
from marona import Marona


async def main():
    identity_token = os.environ["MARONA_IDENTITY_TOKEN"]

    async with Marona(
        api_key=os.environ["MARONA_API_KEY"],
        mode="online",
    ) as marona:
        await marona.sync(interface="api", identity_token=identity_token)

        response = await marona.client(
            model="marona/default",
            input=[{"role": "user", "content": "What is my group fund?"}],
            interface="api",
            identity_token=identity_token,
        )
        print(response.text)


asyncio.run(main())

3. Images And Documents

response = await marona.client(
    model="openai/gpt-4o",
    input=[
        {
            "role": "developer",
            "content": "Keep answers clear and concise.",
        },
        {
            "role": "user",
            "content": [
                {"type": "input_text", "text": "Compare the image and report."},
                {"type": "input_image", "image_url": "https://example.com/match.jpg"},
                {
                    "type": "input_file",
                    "filename": "report.pdf",
                    "file_data": "data:application/pdf;base64,...",
                    "detail": "high",
                },
            ],
        },
    ],
    interface="api",
    identity_token=identity_token,
)

4. Change Models

The request shape does not change:

model="marona/default"
model="openai/gpt-4o"
model="anthropic/claude-sonnet-4"
model="gemini/gemini-2.5-pro"
model="ollama/llama3.2"
model="litellm/local-llama"
model="office/company-assistant"
model="local/gemma-4-e2b"

Known providers need no registration. Register only custom access or an in-process model:

async def office_native_adapter(request):
    result = await office_sdk.generate(request)
    return {"choices": [{"message": {"role": "assistant", "content": result.text}}]}


marona.models.register(
    name="office/company-assistant",
    provider="custom",
    endpoint="https://models.office.example/v1",
    model="company-assistant-v2",
    api_key=os.environ["OFFICE_MODEL_API_KEY"],
    adapter=office_native_adapter,
)

marona.models.register(
    name="local/gemma-4-e2b",
    executor=gemma_executor,
    context_window=2048,
    max_output_tokens=128,
)

Registration configures access. Select the model on each client(...) or message(...) request. models.use(...) is deprecated.

5. Use Marona Tools In Any Agent

Connect Apps, governed Skills, or both after creating Marona with an API key:

tools = await marona.hub.connect(
    ["sda-books", "zimsec"],
    skills=["create-group-fund"],
    adapter="tools",
)

Give tools to your agent framework. When it returns a tool call, execute the matching descriptor through Marona:

result = await marona.tools.execute(
    selected_tool,
    tool_arguments,
    identity_token=identity_token,
    conversation_id="conversation-1",
    model="openai/gpt-4o",
)

When a Skill returns status="planned", call it again only after the user approves, passing {"request": "Yes", "approved": True}.

App tools execute their MCP target. Skill tools execute through Marona's governed runtime. Internal Skill steps and Skill-managed raw capabilities are not exported to the external agent.

6. Publish A Skill

Every workflow entry uses step(); type selects reasoning, approval, or App execution.

from marona.skills import skill, step


@skill(
    name="create-group-fund",
    description="Create a group fund after explicit user approval.",
    governs=["group-fund.create_group"],
)
def create_group_fund():
    request = step(
        id="understand-request",
        type="reasoning",
        instruction="Extract the group name and currency.",
        inputs={"message": "{{ context.user_message }}"},
        outputs={"name": "string", "currency": "string"},
    )
    permission = step(
        id="confirm-create",
        type="approval",
        message=f"Create '{request.name}' in {request.currency}?",
        outputs={"approved": "boolean"},
    )
    return step(
        id="create-group",
        type="app",
        app="group-fund",
        capability="group-fund.create_group",
        instruction="Create the approved group.",
        condition=permission.approved,
        inputs={"name": request.name, "currency": request.currency},
        outputs={"group_id": "string", "name": "string"},
    )


marona.skills.publish(create_group_fund, version="1.0.0")

Mode Rules

• online: network models and online MCP targets are allowed.
• hybrid: try the selected local/private model, then use Edge fallback.
• offline: use cached data, a local model, and installed offline-capable targets only.

Changing model never changes App, Skill, permission, approval, or MCP rules.