plexi-sdk 0.1.4

Python SDK for building Plexi apps via the PGAP v3 protocol

plexi-sdk

Python SDK v2 for building Plexi PGAP apps.

SDK v2 is the Python authoring API. PGAP v3 (pgap/3) is the host/app wire protocol the SDK speaks.

Full API reference: plexi_sdk/__init__.py and docs/sdk-v2.md.

Install For SDK Development

uv pip install -e ./sdk/python

Run from the repo root. uv creates .venv automatically if needed. Changes to sdk/python/plexi_sdk/ take effect immediately in that environment.

Apps running inside Plexi use the SDK copy injected by the host on PYTHONPATH; the editable install is for type checking, tests, and local development.

Verify the install:

source .venv/bin/activate
python3 -c "from plexi_sdk import App; print('ok')"

App Pattern

Normal apps implement view() and return a component tree:

from plexi_sdk import App
from plexi_sdk.ui import AppBar, Column, FooterKeys, Label, Spacer


class CounterApp(App):
    def on_init(self) -> None:
        self.count = self.state.get("count", 0)

    def view(self):
        return Column([
            AppBar("Counter"),
            Spacer(grow=True),
            Label(str(self.count), bold=True),
            Spacer(grow=True),
            FooterKeys([("+", "increment"), ("-", "decrement")]),
        ])

    def on_key(self, key: str, mods: dict) -> None:
        if key in ("plus", "equals"):
            self.count += 1
        elif key == "minus":
            self.count -= 1
        self.state.save({"count": self.count})
        self.emit.schedule_render()


CounterApp().run()

Use on_render(ctx) only for games, animations, realtime visualizations, or other pixel-control apps.

Keyboard Conventions

Keys arrive in on_key(self, key, mods) as lowercase canonical strings.

Physical key	key string
Enter / Return	"return"
Escape	"escape"
Backspace	"backspace"
Tab	"tab"
Space	"space"
Arrow keys	"up" / "down" / "left" / "right"

Use "return", not "Enter". Use "escape", not "Escape".

Common list bindings:

Key	Action
j / "down"	Move selection down
k / "up"	Move selection up
"return"	Open selected item
"escape"	Exit list or go back

State And Host I/O

self.state.get("key", default)
self.state.save({"key": value})
self.emit.schedule_render()
await self.emit.http_get(url)
await self.emit.secret_get("API_KEY")
await self.emit.ai_query("low", system, messages)

Declare capabilities in manifest.toml before using brokered host powers.