agent-webkit-server

Server-side toolkit for exposing the Claude Agent SDK over HTTP+SSE. One Python package; bundled adapters cover the common deployment shapes.

Install

pip install agent-webkit-server                # core only
pip install "agent-webkit-server[fastapi]"     # + FastAPI HTTP adapter
pip install "agent-webkit-server[postgres]"    # + PgSessionStore
pip install "agent-webkit-server[fastapi,postgres]"

Core

Framework-agnostic primitives — no FastAPI, no asyncpg until you opt in.

from agent_webkit_server import PROTOCOL_VERSION
from agent_webkit_server.session import SessionRegistry, SessionConfig
from agent_webkit_server.event_log import EventLog
from agent_webkit_server.sdk_bridge import (
    PermissionRouter,
    build_can_use_tool,
    translate_sdk_messages,
)

These pieces are what you'd otherwise reimplement: per-session inbound queue + receive-loop, append-only event log with multi-subscriber fan-out, permission/AskUserQuestion correlation router, the can_use_tool wiring, and the SDK→wire-event translator.

FastAPI adapter

from agent_webkit_server.adapters.fastapi import create_app
from agent_webkit_server.auth import AuthConfig

app = create_app(auth=AuthConfig.from_env())

Exposes:

• POST /sessions
• GET /sessions/{id}/stream (SSE, with Last-Event-ID resume)
• POST /sessions/{id}/input (every inbound message type)
• DELETE /sessions/{id}

Postgres adapter (PgSessionStore)

Plug into the SDK directly via ClaudeAgentOptions(session_store=...):

from claude_agent_sdk import ClaudeAgentOptions, ClaudeSDKClient
from agent_webkit_server.adapters.pg_session_store import PgSessionStore

store = await PgSessionStore.connect("postgresql://...")
options = ClaudeAgentOptions(session_store=store, resume=session_id)
client = ClaudeSDKClient(options=options)

Passes the SDK's published run_session_store_conformance suite plus adapter-specific contracts (uuid idempotency, concurrent-append serialization, multi-tenant isolation).

Wire protocol

Documented in docs/wire-protocol.md. The Pydantic models in agent_webkit_server.models are the canonical schema.