linkworld-sdk 0.4.0

Build apps for the Linkworld Open App Platform

linkworld-sdk

Python SDK for building apps on the Linkworld Open App Platform.

Status: 0.x alpha. Phase 2 of the open-platform rollout. Decorator API is stable; production runtime (MCP-based dispatch) lands with platform Milestone 5. Until then, run apps in local mode to develop against the SDK, then deploy once the platform side is online.

Install

pip install linkworld-sdk

60-second tour

from linkworld_sdk import App

app = App.from_manifest("linkworld.app.yaml")

@app.on_inbound
async def handle(ctx, env):
    await ctx.tools.call(
        "email_send",
        to="[e-mail]",
        subject="Inbound!",
        body=f"From {env.user_id}: {env.message_text}",
    )

if __name__ == "__main__":
    app.run()

The matching manifest:

apiVersion: linkworld.ai/v2
app_id: my-app
version: 0.1.0
name: My App
required_scopes: [mail.send]
runtime:
  image: ghcr.io/your-org/my-app:0.1.0
lifecycle:
  on_inbound: true

Local development

LINKWORLD_LOCAL=1 python main.py

This starts a trigger HTTP server you can curl to simulate any platform event. Tools are mocked — ctx.tools.call(...) records the call and returns whatever you wired with MockTools.

See examples/hello-world/ for a runnable walkthrough.

Testing your app

import pytest
from linkworld_sdk.testing import TestClient
from my_app import app

@pytest.fixture
def client():
    return TestClient(app)

async def test_echo(client):
    client.tools.set_response("email_send", {"sent": True})
    await client.simulate_inbound(
        tenant_id="t1", user_id="u1", message_text="hello"
    )
    assert client.tools.calls[0][0] == "email_send"
    assert client.tools.calls[0][1]["body"] == "From u1: hello"

Decorator API

Decorator	Receives	When
@app.on_inbound	(ctx, env)	Tenant got an inbound message and opted into fan-out
@app.on_install	(ctx)	Tenant activated the app
@app.on_uninstall	(ctx)	Tenant deactivated the app
@app.on_user_added	(ctx, user)	New user joined the tenant
@app.on_schedule(name)	(ctx)	Cron entry from lifecycle.schedules[name] fires
@app.tool(name, ...)	(ctx, **args)	Custom tool exposed to tenant agents

Every handler receives a Context:

ctx.tenant_id        # UUID of the tenant
ctx.user_id          # UUID of the originating user, or None
ctx.app_id           # this app's slug
ctx.event_type       # 'inbound', 'schedule', 'install', etc.
ctx.tools            # ctx.tools.call("tool_name", **args)
ctx.secrets          # await ctx.secrets.get("KEY")
ctx.logger           # structlog-compatible logger

Manifest schema

The full schema lives at packages/sdk-spec/manifest-v2.schema.yaml. Validate locally with linkworld_sdk.load_manifest("linkworld.app.yaml").

License

MIT — see LICENSE.