statewire
The Statewire protocol for Python: a Statewire host owns one JSON state dict, streams every change to attached clients as ops, and dispatches typed commands back. Part of harness-sdk, with harness-sdk and pinned.
Install
uv add statewire
Extras: uv add "statewire[langgraph]", uv add "statewire[orjson]".
Use
from fastapi import FastAPI
from pinned import PinnedHost, PinnedWorker
from statewire import Statewire, StatewireReject, command
class Counter(Statewire):
async def lifespan(self):
self.state = {"count": 0}
yield
@command
async def increment(self):
if self.state["count"] >= 10:
raise StatewireReject("the counter is full (max 10)")
self.state["count"] += 1
worker = PinnedWorker()
app = FastAPI()
app.include_router(worker)
app.include_router(PinnedHost(Counter, worker=worker, namespace="/threads"))
Protocols and documents
Connections negotiate date ranges through Statewire-Version and Statewire-Protocol. Protocols are additive and required by default. The server selects versions in syn; WebSockets use statewire.v1.
Each protocol owns its commands and its documents, and mints statement seqs in its own lane. Ephemeral subprotocols (Statewire.Subprotocol("interest", record="ephemeral")) restart their lane on every attach and carry per-attach documents mounted from handlers via ctx.attach. Python hosts support chained compatibility adapters.
See the protocol registration and migration guide.
Docs
- Get started: https://github.com/assistant-ui/harness-sdk/blob/main/apps/docs/app/statewire/docs/get-started/statewire/page.mdx
- Guide: https://github.com/assistant-ui/harness-sdk/blob/main/apps/docs/app/statewire/docs/guides/statewire/host/page.mdx
- Reference: https://github.com/assistant-ui/harness-sdk/blob/main/apps/docs/app/statewire/docs/reference/statewire-python/page.mdx
- Spec: https://github.com/assistant-ui/harness-sdk/blob/main/apps/docs/app/statewire/docs/spec/statewire-protocol/page.mdx
Lease context
client = StatewireClient.sse(url, context={"acme-chat": {"locale": "en"}})
client.set_context("acme-chat", {"locale": "de"})
Context is a full object per protocol and connection lease. The client restores its latest values on every new attachment, including a fresh hello on the same socket. Hosts validate candidates through validate_context and react through context_changed. Commands read their admission snapshot through ctx.context; later replacements do not alter queued commands. Context supports document datetime metadata, has a 64 KiB limit per entry, and consumes no command sequence numbers.
1 maintainer
Metadata
1 maintainer
Release files for statewire 0.19.0
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