Marona SDK

Official developer SDK for building Marona-compatible apps, MCP servers, tool servers, skills, and workflows.

Use marona-sdk when you are building an app that exposes tools to Marona Hub. Use marona when you are building an application or interface that calls a Marona-compatible runtime.

The SDK helps your app expose the Marona standard automatically:

• GET /health
• GET /manifest
• GET /hub-registration
• POST /mcp/ using the official MCP Python SDK FastMCP
• tool outputs with status, success, message, content, content_type, presentation_hint, and context

Install

Python:

pip install marona-sdk

In requirements.txt:

marona-sdk

Import it as:

from marona_sdk import AgentApp, HostingConfig, success

Dart:

dart pub add marona_sdk
dart pub global activate marona_sdk

TypeScript:

npm install marona-sdk

1. Create An App

Every app needs a unique app ID, also called a slug. Examples:

• weather-mcp
• knowledge-mcp
• company-crm-mcp

from marona_sdk import AgentApp, success

agent_app = AgentApp(
    name="Weather Tools",
    slug="weather-mcp",
    description="Weather lookup tools for agents and AI interfaces.",
    category="Weather",
    visibility="public",
)

Use visibility="public" when the app should be discoverable in Hub. Use visibility="private" when the app is only for the owner's workspace.

Apps also declare where they can run:

agent_app = AgentApp(
    name="Knowledge Tools",
    slug="knowledge-mcp",
    description="Search company knowledge.",
    category="Knowledge",
    execution_modes=["online", "offline", "hybrid"],
    execution_targets=[
        {
            "mode": "offline",
            "type": "python_package",
            "package_url": "https://packages.example.com/knowledge-mcp-1.0.0.zip",
            "sha256": "<64-character-sha256>",
            "entrypoint": "marona_offline:call_tool",
            "runtime_contract": "marona:tool-component@1",
            "transport": "streamable_http",
            "endpoint": "/mcp",
            "port": 62750,
            "assets": ["knowledge-index", "document-cache"],
        }
    ],
)

execution_modes can be online, offline, or hybrid. execution_targets must use remote_mcp or marona_hosted for online execution and signed python_package, wasm, static_cache, or builtin targets for offline execution. Do not submit device-local runtime fields; Marona clients resolve those after an app is installed on a device or private network.

2. Add A Tool

@agent_app.tool(
    title="Get forecast",
    description="Return the weather forecast for a city.",
    input_schema={
        "type": "object",
        "properties": {
            "city": {"type": "string"},
        },
        "required": ["city"],
        "additionalProperties": False,
    },
)
def get_forecast(city: str) -> dict:
    return success(
        f"The forecast for {city} is sunny.",
        content=f"The forecast for {city} is sunny.",
        content_type="text",
        presentation_hint="display_as_provided",
        context="Display the forecast directly unless the user asks for another format.",
        data={"city": city, "condition": "sunny"},
    )

3. Run The Server

app = agent_app.create_fastapi_app()

Run locally:

uvicorn examples.hello_server:app --host 127.0.0.1 --port 62900

Inspect:

http://127.0.0.1:62900/health
http://127.0.0.1:62900/manifest
http://127.0.0.1:62900/hub-registration
http://127.0.0.1:62900/mcp/

4. Choose Hosting

Marona supports two hosting models.

Option A: self-hosted

You run the server yourself and register its public MCP URL in Marona Hub.

agent_app = AgentApp(
    name="Weather Tools",
    slug="weather-mcp",
    description="Weather lookup tools.",
    category="Weather",
    hosting=HostingConfig(mode="self_hosted"),
)

Your deployment is responsible for uptime, logs, scaling, secrets, storage, domains, and monitoring. Marona Hub can still list and review the app, and runtime users can discover it after approval.

Option B: Marona-hosted

For Marona-hosted apps, provide source from a repository or source archive. Marona builds and deploys it internally, then manages health, logs, metrics, secrets, regions, scaling, storage, and public URLs.

agent_app = AgentApp(
    name="Weather Tools",
    slug="weather-mcp",
    description="Weather lookup tools.",
    category="Weather",
    hosting=HostingConfig(
        mode="marona_hosted",
        source_type="repository",
        source_url="https://github.com/example/weather-mcp",
        version="1.0.0",
        runtime="python",
        region="africa-south-1",
        resource_class="shared-small",
        replicas=1,
        storage_gb=1,
        secrets={"OPENAI_API_KEY": "set-in-portal"},
        environment={"LOG_LEVEL": "info"},
        runtime_config={"port": 8000, "endpoint": "/mcp"},
    ),
)

Secret values are not exposed in /hub-registration; only configured secret names are shown. Developers do not need to manage hosting infrastructure. Use runtime config for MCP runtime settings such as port and endpoint.

5. Publish To Marona Hub

DeveloperHubClient is for developer workflow commands such as create, sync, submit, and hosted deployment setup.

from marona_sdk import DeveloperHubClient

client = DeveloperHubClient(
    hub_url="https://hub.marona.ai",
    token="DEVELOPER_PORTAL_TOKEN",
)

Apps, devices, bots, and user interfaces should use the separate marona runtime client package.

Create, sync, submit, then publish and deploy:

detail = await client.create_agent_app(agent_app.hub_registration(
    server_url="https://weather.example.com/mcp/",
    health_check_url="https://weather.example.com/health",
))
await client.sync_agent_app(detail["id"])
await client.submit_agent_app(detail["id"])

deployment = await client.create_hosted_deployment(
    detail["id"],
    source_type="repository",
    source_url="https://github.com/example/weather-mcp",
    runtime="python",
    region="africa-south-1",
    runtime_config={"port": 8000, "endpoint": "/mcp"},
    secrets={"OPENAI_API_KEY": "set-in-portal"},
)

Or use the CLI. This is a Marona Hub core deliverable for developers who want to build, publish, and deploy MCP apps without managing Hub API calls manually.

marona publish --registration app-registration.json --submit
marona deploy \
  --app-id app_123 \
  --source-url https://github.com/example/weather-mcp \
  --source-type repository \
  --version 1.0.0 \
  --region africa-south-1 \
  --runtime-config '{"port":8000,"endpoint":"/mcp"}'

Marona returns a deployment record with status, region, workload id, public URL, MCP URL, health URL, logs URL, and metrics URL. Admin activation provisions the workload and points the app’s live MCP endpoint at the hosted URL after health checks pass.

Standard Tool Results

All Marona-compatible tools should return the SDK result shape:

• status: machine-readable result status
• success: boolean result success flag
• message: short user-facing status line
• content: primary user-facing text or content
• content_type: provider-neutral content type, such as text, document, message, list, media, or search_results
• presentation_hint: provider-neutral usage hint, such as display_as_provided
• context: short guidance for interpreting the result

Provider-specific data should live under generic fields:

• data: one structured object
• items: a list of structured objects
• count: item count when items is used
• artifacts: generic artifact descriptors
• job: generic async job metadata

If a tool declares its own output_schema, the SDK merges these standard fields into that schema before exposing /manifest and /hub-registration.

Standard Tool Inputs For User Files

Tools that consume uploaded files should declare the SDK-standard attachments input property. The runtime injects the current conversation files into that array automatically.

from marona_sdk import standard_attachments_property

input_schema = {
    "type": "object",
    "properties": {
        "question": {"type": "string"},
        "attachments": standard_attachments_property(),
    },
    "required": [],
    "additionalProperties": False,
}

Each attachment can include artifact_id, filename, mime_type, kind, url, file_url, content_base64, content, and metadata.

Package Names

• Python developer SDK: marona-sdk, import marona_sdk
• Dart developer SDK: marona_sdk, import package:marona_sdk/marona_sdk.dart
• TypeScript developer SDK: marona-sdk, import from "marona-sdk"
• Runtime client SDKs: marona