aiobs 0.1.1

Minimal, extensible LLM observability SDK with OpenAI and Gemini support.

aiobs

A tiny, extensible observability layer for LLM calls. Add three lines around your code and get JSON traces for requests, responses, timings, and errors.

Supported Providers

• OpenAI — Chat Completions API (openai>=1.0)
• Google Gemini — Generate Content API (google-genai>=1.0)

Quick Install

# Core only
pip install aiobs

# With OpenAI support
pip install aiobs[openai]

# With Gemini support
pip install aiobs[gemini]

# With all providers
pip install aiobs[all]

Quick Start

from aiobs import observer

observer.observe()    # start a session and auto-instrument providers
# ... make your LLM calls (OpenAI, Gemini, etc.) ...
observer.end()        # end the session
observer.flush()      # write a single JSON file to disk

By default, events flush to ./llm_observability.json. Override with LLM_OBS_OUT=/path/to/file.json.

Provider Examples

OpenAI

from aiobs import observer
from openai import OpenAI

observer.observe()

client = OpenAI()
response = client.chat.completions.create(
    model="gpt-4o-mini",
    messages=[{"role": "user", "content": "Hello!"}]
)

observer.end()
observer.flush()

Google Gemini

from aiobs import observer
from google import genai

observer.observe()

client = genai.Client()
response = client.models.generate_content(
    model="gemini-2.0-flash",
    contents="Hello!"
)

observer.end()
observer.flush()

Function Tracing with @observe

Trace any function (sync or async) by decorating it with @observe:

from aiobs import observer, observe

@observe
def research(query: str) -> list:
    # your logic here
    return results

@observe(name="custom_name")
async def fetch_data(url: str) -> dict:
    # async logic here
    return data

observer.observe(session_name="my-pipeline")
research("What is an API?")
observer.end()
observer.flush()

Decorator Options

Option	Default	Description
name	function name	Custom display name for the traced function
capture_args	True	Whether to capture function arguments
capture_result	True	Whether to capture the return value

# Don't capture sensitive arguments
@observe(capture_args=False)
def login(username: str, password: str):
    ...

# Don't capture large return values
@observe(capture_result=False)
def get_large_dataset():
    ...

What Gets Captured

For each decorated function call:

• Function name and module
• Input arguments (args/kwargs)
• Return value
• Timing: start/end timestamps, duration_ms
• Errors: exception name and message if the call fails
• Callsite: file path, line number where the function was defined

Run the Examples

• Simple OpenAI example:

  python example/simple-chat-completion/chat.py
  

• Gemini example:

  python example/gemini/main.py
  

• Multi-file pipeline example:

  python -m example.pipeline.main "Explain vector databases to a backend engineer"
  

What Gets Captured (LLM Calls)

• Provider: openai or gemini
• API: e.g., chat.completions or models.generateContent
• Request: model, messages/contents, core parameters
• Response: text, model, token usage (when available)
• Timing: start/end timestamps, duration_ms
• Errors: exception name and message if the call fails
• Callsite: file path, line number, and function name where the API was called

Data Models

Internally, the SDK structures data with Pydantic models (v2):

• aiobs.Session – Session metadata
• aiobs.Event – LLM provider call event
• aiobs.FunctionEvent – Decorated function trace event
• aiobs.ObservedEvent (Event + session_id)
• aiobs.ObservedFunctionEvent (FunctionEvent + session_id)
• aiobs.ObservabilityExport (flush payload)

These are exported to allow downstream tooling to parse and validate the JSON output and to build integrations.

Extensibility

Providers are classes that implement a small abstract interface and install their own hooks.

• Base class: aiobs.BaseProvider
• Built-in: OpenAIProvider, GeminiProvider (auto-detected and installed if available)

Custom provider skeleton:

from aiobs import BaseProvider, observer

class MyProvider(BaseProvider):
    name = "my-provider"

    @classmethod
    def is_available(cls) -> bool:
        try:
            import my_sdk  # noqa: F401
            return True
        except Exception:
            return False

    def install(self, collector):
        # monkeypatch or add hooks into your SDK, then
        # call collector._record_event({ ... normalized payload ... })
        def unpatch():
            pass
        return unpatch

# Register before observe()
observer.register_provider(MyProvider())
observer.observe()

Architecture

• Core
  • Collector holds sessions/events and flushes a single JSON file.
  • aiobs.models.* define Pydantic schemas for sessions/events/export.
• Providers (N-layered)
  • providers/base.py: BaseProvider interface.
  • providers/openai/: OpenAI Chat Completions instrumentation.
  • providers/gemini/: Google Gemini Generate Content instrumentation.

Providers construct Pydantic request/response models and pass typed Event objects to the collector; only the collector serializes to JSON.

Docs

Sphinx documentation lives under docs/.

• Install docs deps:

  pip install aiobs[docs]
  

• Build HTML docs:

  python -m sphinx -b html docs docs/_build/html
  

• Open docs/_build/html/index.html in your browser.

GitHub Pages

• Docs auto-deploy from main via GitHub Actions.
• Site available at: https://neuralis-in.github.io/aiobs/