unique-search-proxy-sdk 2026.28.0.dev1

Async HTTP client for the Unique Search Proxy API

unique-search-proxy-sdk

Part of Unique Search Proxy · PyPI: unique-search-proxy-sdk

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1. What this package is

The SDK is the caller's HTTP client. Platform services (e.g. assistants-core) use it to reach the proxy pod at runtime — search, agent search, and crawl — without hand-crafting httpx calls or duplicating route paths.

It depends on core for request validation and typed errors. It does not include the FastAPI server.

Package	Question it answers
Core	What can be configured and what does a valid request/response look like?
Client	How are provider calls executed at runtime?
SDK (this)	How do callers reach the proxy over HTTP?

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2. Role in the system

The SDK implements Path B (runtime HTTP) from the system overview. Schema work (Path A) stays in core — the SDK does not expose deployment config or LLM call-schema endpoints.

flowchart LR
    Caller["Caller service"]
    SDK["unique_search_proxy_sdk"]
    Core["unique_search_proxy_core"]
    Proxy["unique_search_proxy_client"]

    Caller --> SDK
    SDK --> Core
    SDK -->|"httpx"| Proxy

Before a search call, the caller (or SDK) validates the payload against core request models. Non-2xx responses become the same ProxyError subclasses defined in core.

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3. Architecture

Two layers: a hand-written facade over OpenAPI-generated code.

flowchart TB
    subgraph sdk_pkg["unique_search_proxy_sdk"]
        Facade["UniqueSearchProxyClient"]
        SC["SearchClient"]
        ASC["AgentSearchClient"]
        CC["CrawlClient"]
        Transport["OpenapiTransport"]
        Gen["_generated/"]
        Conv["converters.py"]
        Err["errors.py"]
    end

    Core["unique_search_proxy_core"]
    Proxy["Proxy pod"]

    Facade --> SC & ASC & CC
    SC & ASC & CC --> Transport
    Transport --> Gen
    SC --> Conv --> Core
    Err --> Core
    Gen -->|"httpx AsyncClient"| Proxy

Layer	Path	Responsibility
Facade	client.py	UniqueSearchProxyClient — composes sub-clients, health(), ready()
Sub-clients	search_client.py, agent_search_client.py, crawl_client.py	Per-provider typed endpoints + compatibility dispatchers
Endpoint factory	_endpoint.py	async_post_endpoint / async_sse_endpoint (ParamSpec from core request models)
Transport	_transport.py, _http.py	Shared httpx lifecycle, base URL, timeout
Generated	_generated/	Route functions + attrs models from OpenAPI (do not edit)
Converters	converters.py	Core Pydantic models → generated SDK models
Errors	errors.py	Error envelope → core ProxyError subclasses

The client package is the source of truth for the HTTP contract. When routes change, regenerate _generated/ from unique_search_proxy_client/openapi.json.

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4. Usage

Each provider exposes a typed endpoint whose kwargs mirror the core *Request Pydantic model (via ParamSpec). Snake_case and camelCase aliases both work (fetch_size / fetchSize).

from unique_search_proxy_sdk import UniqueSearchProxyClient

async with UniqueSearchProxyClient("http://unique-search-proxy:2349") as client:
    await client.health()

    # Typed per-provider endpoints (preferred)
    result = await client.search.google(query="unique ag", gl="ch", fetch_size=10)
    brave = await client.search.brave(query="news", country="US", safesearch="strict")
    agent = await client.agent_search.bing(query="EU AI Act timeline", fetch_size=5)
    crawl = await client.crawl.basic(urls=["https://example.com"])

    # Compatibility dispatchers (engine/crawler string)
    result = await client.search.search("unique ag", engine="google", fetch_size=10)
    agent = await client.agent_search.search("query", engine="bing")
    crawl = await client.crawl.crawl(["https://example.com"], crawler="Basic")

    # Agent SSE streaming
    async for event in client.agent_search.bing_stream(query="query"):
        ...

    # Low-level: one generated function per route
    raw_client = client.openapi

Search payloads are validated through core's parse_search_request() before serialization. Agent and crawl clients follow the same pattern.

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5. API mapping

Facade method	HTTP
health()	GET /health
ready()	GET /ready
search.google(...) / .brave(...) / .perplexity(...)	POST /v1/search
search.search(...)	POST /v1/search (dispatcher)
agent_search.bing(...) / .vertexai(...)	POST /v1/agent-search
agent_search.bing_stream(...) / .vertexai_stream(...)	POST /v1/agent-search/stream (SSE)
agent_search.search(...) / .stream(...)	same routes (dispatchers)
crawl.basic(...) / .tavily(...) / .jina(...) / .firecrawl(...)	POST /v1/crawl
crawl.crawl(...)	POST /v1/crawl (dispatcher)
openapi	Low-level generated client (one function per route)

Endpoint payloads and provider ids → Client README.

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6. Error handling

Non-success responses with a proxy error envelope raise typed exceptions from core:

from unique_search_proxy_core import EngineNotConfiguredError, UpstreamError

ENGINE_NOT_CONFIGURED (503) includes missing_env_vars parsed from the error details list — useful for operators and LLM tool consumers.

Transport failures (non-JSON body, connection errors) raise UniqueSearchProxyClientError.

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7. Codegen workflow

Generated via openapi-python-client from the server's OpenAPI spec.

cd ../unique_search_proxy_client
uv sync
uv run python scripts/generate_sdk.py

Path	Role
unique_search_proxy_sdk/_generated/	Regenerated httpx client + attrs models
unique_search_proxy_client/openapi.json	Exported spec (codegen input)
unique_search_proxy_sdk/client.py	Hand-written facade (not regenerated)

Other codegen tools considered: OpenAPI Generator, datamodel-code-generator, Kiota — see git history in the client README if needed.

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8. Testing

Pass an injected httpx.AsyncClient with ASGITransport for in-process tests against create_app():

import httpx
from httpx import ASGITransport
from unique_search_proxy_client.web.app import create_app
from unique_search_proxy_sdk import UniqueSearchProxyClient

app = create_app()
async with httpx.AsyncClient(
    transport=ASGITransport(app=app),
    base_url="http://test",
) as http:
    async with UniqueSearchProxyClient("http://test", http_client=http) as client:
        ...

Run the app lifespan so the in-process HttpClientPool is initialised.

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9. Installation & development

cd unique_search_proxy_sdk
uv sync
uv run pytest
uv run ruff check .
uv run basedpyright

Depends on unique-search-proxy-core. Does not depend on unique-search-proxy at runtime (only as a dev dependency for integration tests).

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License

Proprietary — Unique AG