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Llama Stack Client Python API library
The Llama Stack Client Python library provides convenient access to the Llama Stack Client REST API from any Python 3.7+ application. The library includes type definitions for all request params and response fields, and offers both synchronous and asynchronous clients powered by httpx.
It is generated with Stainless.
Documentation
For starting up a Llama Stack server, please checkout our guides in our llama-stack repo.
The REST API documentation can be found on our llama-stack OpenAPI spec. The full API of this library can be found in api.md.
You can find more example apps with client SDKs to talk with the Llama Stack server in our llama-stack-apps repo.
Installation
pip install llama-stack-client
Usage
The full API of this library can be found in api.md. You may find basic client examples in the /examples folder.
from llama_stack_client import LlamaStackClient
from llama_stack_client.types import UserMessage
client = LlamaStackClient(
base_url=f"http://{host}:{port}",
)
response = client.inference.chat_completion(
messages=[
UserMessage(
content="hello world, write me a 2 sentence poem about the moon",
role="user",
),
],
model="Llama3.1-8B-Instruct",
stream=False,
)
print(response)
Async usage
Simply import AsyncLlamaStackClient
instead of LlamaStackClient
and use await
with each API call:
import asyncio
from llama_stack_client import AsyncLlamaStackClient
client = AsyncLlamaStackClient(
# defaults to "production".
environment="sandbox",
)
async def main() -> None:
session = await client.agents.sessions.create(
agent_id="agent_id",
session_name="session_name",
)
print(session.session_id)
asyncio.run(main())
Functionality between the synchronous and asynchronous clients is otherwise identical.
Using types
Nested request parameters are TypedDicts. Responses are Pydantic models which also provide helper methods for things like:
- Serializing back into JSON,
model.to_json()
- Converting to a dictionary,
model.to_dict()
Typed requests and responses provide autocomplete and documentation within your editor. If you would like to see type errors in VS Code to help catch bugs earlier, set python.analysis.typeCheckingMode
to basic
.
Handling errors
When the library is unable to connect to the API (for example, due to network connection problems or a timeout), a subclass of llama_stack_client.APIConnectionError
is raised.
When the API returns a non-success status code (that is, 4xx or 5xx
response), a subclass of llama_stack_client.APIStatusError
is raised, containing status_code
and response
properties.
All errors inherit from llama_stack_client.APIError
.
import llama_stack_client
from llama_stack_client import LlamaStackClient
client = LlamaStackClient()
try:
client.agents.sessions.create(
agent_id="agent_id",
session_name="session_name",
)
except llama_stack_client.APIConnectionError as e:
print("The server could not be reached")
print(e.__cause__) # an underlying Exception, likely raised within httpx.
except llama_stack_client.RateLimitError as e:
print("A 429 status code was received; we should back off a bit.")
except llama_stack_client.APIStatusError as e:
print("Another non-200-range status code was received")
print(e.status_code)
print(e.response)
Error codes are as followed:
Status Code | Error Type |
---|---|
400 | BadRequestError |
401 | AuthenticationError |
403 | PermissionDeniedError |
404 | NotFoundError |
422 | UnprocessableEntityError |
429 | RateLimitError |
>=500 | InternalServerError |
N/A | APIConnectionError |
Retries
Certain errors are automatically retried 2 times by default, with a short exponential backoff. Connection errors (for example, due to a network connectivity problem), 408 Request Timeout, 409 Conflict, 429 Rate Limit, and >=500 Internal errors are all retried by default.
You can use the max_retries
option to configure or disable retry settings:
from llama_stack_client import LlamaStackClient
# Configure the default for all requests:
client = LlamaStackClient(
# default is 2
max_retries=0,
)
# Or, configure per-request:
client.with_options(max_retries=5).agents.sessions.create(
agent_id="agent_id",
session_name="session_name",
)
Timeouts
By default requests time out after 1 minute. You can configure this with a timeout
option,
which accepts a float or an httpx.Timeout
object:
from llama_stack_client import LlamaStackClient
# Configure the default for all requests:
client = LlamaStackClient(
# 20 seconds (default is 1 minute)
timeout=20.0,
)
# More granular control:
client = LlamaStackClient(
timeout=httpx.Timeout(60.0, read=5.0, write=10.0, connect=2.0),
)
# Override per-request:
client.with_options(timeout=5.0).agents.sessions.create(
agent_id="agent_id",
session_name="session_name",
)
On timeout, an APITimeoutError
is thrown.
Note that requests that time out are retried twice by default.
Advanced
Logging
We use the standard library logging
module.
You can enable logging by setting the environment variable LLAMA_STACK_CLIENT_LOG
to debug
.
$ export LLAMA_STACK_CLIENT_LOG=debug
How to tell whether None
means null
or missing
In an API response, a field may be explicitly null
, or missing entirely; in either case, its value is None
in this library. You can differentiate the two cases with .model_fields_set
:
if response.my_field is None:
if 'my_field' not in response.model_fields_set:
print('Got json like {}, without a "my_field" key present at all.')
else:
print('Got json like {"my_field": null}.')
Accessing raw response data (e.g. headers)
The "raw" Response object can be accessed by prefixing .with_raw_response.
to any HTTP method call, e.g.,
from llama_stack_client import LlamaStackClient
client = LlamaStackClient()
response = client.agents.sessions.with_raw_response.create(
agent_id="agent_id",
session_name="session_name",
)
print(response.headers.get('X-My-Header'))
session = response.parse() # get the object that `agents.sessions.create()` would have returned
print(session.session_id)
These methods return an APIResponse
object.
The async client returns an AsyncAPIResponse
with the same structure, the only difference being await
able methods for reading the response content.
.with_streaming_response
The above interface eagerly reads the full response body when you make the request, which may not always be what you want.
To stream the response body, use .with_streaming_response
instead, which requires a context manager and only reads the response body once you call .read()
, .text()
, .json()
, .iter_bytes()
, .iter_text()
, .iter_lines()
or .parse()
. In the async client, these are async methods.
with client.agents.sessions.with_streaming_response.create(
agent_id="agent_id",
session_name="session_name",
) as response:
print(response.headers.get("X-My-Header"))
for line in response.iter_lines():
print(line)
The context manager is required so that the response will reliably be closed.
Making custom/undocumented requests
This library is typed for convenient access to the documented API.
If you need to access undocumented endpoints, params, or response properties, the library can still be used.
Undocumented endpoints
To make requests to undocumented endpoints, you can make requests using client.get
, client.post
, and other
http verbs. Options on the client will be respected (such as retries) will be respected when making this
request.
import httpx
response = client.post(
"/foo",
cast_to=httpx.Response,
body={"my_param": True},
)
print(response.headers.get("x-foo"))
Undocumented request params
If you want to explicitly send an extra param, you can do so with the extra_query
, extra_body
, and extra_headers
request
options.
Undocumented response properties
To access undocumented response properties, you can access the extra fields like response.unknown_prop
. You
can also get all the extra fields on the Pydantic model as a dict with
response.model_extra
.
Configuring the HTTP client
You can directly override the httpx client to customize it for your use case, including:
- Support for proxies
- Custom transports
- Additional advanced functionality
from llama_stack_client import LlamaStackClient, DefaultHttpxClient
client = LlamaStackClient(
# Or use the `LLAMA_STACK_CLIENT_BASE_URL` env var
base_url="http://my.test.server.example.com:8083",
http_client=DefaultHttpxClient(
proxies="http://my.test.proxy.example.com",
transport=httpx.HTTPTransport(local_address="0.0.0.0"),
),
)
You can also customize the client on a per-request basis by using with_options()
:
client.with_options(http_client=DefaultHttpxClient(...))
Managing HTTP resources
By default the library closes underlying HTTP connections whenever the client is garbage collected. You can manually close the client using the .close()
method if desired, or with a context manager that closes when exiting.
Versioning
This package generally follows SemVer conventions, though certain backwards-incompatible changes may be released as minor versions:
- Changes that only affect static types, without breaking runtime behavior.
- Changes to library internals which are technically public but not intended or documented for external use. (Please open a GitHub issue to let us know if you are relying on such internals).
- Changes that we do not expect to impact the vast majority of users in practice.
We take backwards-compatibility seriously and work hard to ensure you can rely on a smooth upgrade experience.
We are keen for your feedback; please open an issue with questions, bugs, or suggestions.
Determining the installed version
If you've upgraded to the latest version but aren't seeing any new features you were expecting then your python environment is likely still using an older version.
You can determine the version that is being used at runtime with:
import llama_stack_client
print(llama_stack_client.__version__)
Requirements
Python 3.7 or higher.