lime-sites-sdk

Accept AI agent login on your site backend — create a request, get a Core-signed passport over SSE, verify locally with JWKS.

from lime_sites import LimeSite

site = LimeSite()  # LIME_SITE_TOKEN — construct inside a running asyncio loop

@site.on_login
async def handle_login(request_id: str, passport: str | None) -> None:
    if passport is None:
        return  # expired
    verified = await site.verify_passport(passport, expected_request_id=request_id)
    # issue YOUR session cookie from verified.claims

req = await site.create_login_request()
# hand req.request_id to the agent worker → agent.login(request_id)

What the SDK handles: Site Token auth · login request · SSE passport delivery · JWKS verify · optional agent binding.

Docs: Read the Docs · lime.pics/docs · Platform

Installation

pip install lime-sites-sdk
export LIME_SITE_TOKEN=st_...   # from https://lime.pics — site portal

Requirements: Python 3.10+ · httpx · PyJWT · cryptography
Config: one secret — LIME_SITE_TOKEN (or site_token=). Never give Site Token to the agent.

Quick start (canonical) — FastAPI site login

from contextlib import asynccontextmanager

from fastapi import FastAPI
from lime_sites import InvalidPassportError, LimeSite

pending_logins: dict[str, object] = {}
site: LimeSite


@asynccontextmanager
async def lifespan(app: FastAPI):
    global site
    site = LimeSite()  # one LimeSite per process / site token

    @site.on_login
    async def handle_login(request_id: str, passport: str | None) -> None:
        if passport is None:
            pending_logins.pop(request_id, None)
            return
        try:
            verified = await site.verify_passport(
                passport,
                expected_request_id=request_id,
            )
        except InvalidPassportError:
            pending_logins.pop(request_id, None)
            return
        pending_logins[request_id] = verified.claims  # set YOUR session

    yield
    await site.aclose()


app = FastAPI(lifespan=lifespan)


@app.post("/login/start")
async def start_login() -> dict[str, str]:
    req = await site.create_login_request()
    return {"request_id": req.request_id}

Copy-paste: examples/fastapi-login/.

Agent worker (separate package): lime-agents-sdk → await agent.login(request_id).

Mental model

LimeSite
├── Site login (primary)   create_login_request · on_login · verify_passport
├── Agent binding          create_binding_request · verify_binding_passport
└── Lifecycle              aclose()

Site login ≠ agent binding. MCP Bearer (aud=mcp) is not verified here — use lime-mcp-server-sdk.

Rules that prevent foot-guns

Second scenario — Agent binding

Bind a LIME agent_id to a signed-in human via Connect (aud=lime-binding). No SSE.

req = await site.create_binding_request(redirect_uri="https://yoursite.example/bind/callback")
# persist req.binding_id ↔ user_id, redirect browser to req.connect_url
# callback: verify_binding_passport(passport) → claims["binding_id"] / claims["agent_id"]

Example: examples/binding/. Details in Read the Docs.

Minimal end-to-end loop

With both SDKs installed (lime-sites-sdk + lime-agents-sdk):

import asyncio

from lime_agents import LimeAgent
from lime_sites import LimeSite

async def main() -> None:
    received = asyncio.Event()
    box: dict[str, str] = {}

    site = LimeSite()

    @site.on_login
    async def handle_login(request_id: str, passport: str | None) -> None:
        if passport:
            box["jwt"] = passport
            received.set()

    req = await site.create_login_request()

    async with LimeAgent() as agent:
        await agent.login(req.request_id)

    await asyncio.wait_for(received.wait(), timeout=120)
    verified = await site.verify_passport(box["jwt"], expected_request_id=req.request_id)
    print(verified.claims)
    await site.aclose()

asyncio.run(main())

Example: examples/minimal-loop/.

API surface (summary)

Env: LIME_SITE_TOKEN (required unless constructor), LIME_API_BASE (optional).

Related packages

Examples

Contributing

git clone https://github.com/Mawyxx/lime-site-sdk.git
cd lime-site-sdk
pip install -e ".[dev]"
ruff check src tests
mypy src/lime_sites
pytest --cov=lime_sites --cov-fail-under=100

License

MIT — see LICENSE.