Cycles Python Client Examples

Runnable examples demonstrating how to integrate the runcycles client into real-world Python applications.

Prerequisites

1. A running Cycles server (see Deploy the Full Stack)
2. Set environment variables:

export CYCLES_BASE_URL="http://localhost:7878"
export CYCLES_API_KEY="your-api-key"   # create via Admin Server — see link above
export CYCLES_TENANT="acme"

3. Install the client:

pip install runcycles

Examples

File	Description	Extra Dependencies
basic_usage.py	Programmatic reserve → commit lifecycle	—
decorator_usage.py	@cycles decorator with estimates, caps, and metrics	—
async_usage.py	Async client and async decorator	—
openai_integration.py	Guard OpenAI chat completions with budget checks	openai
anthropic_integration.py	Guard Anthropic messages with per-tool budget tracking	anthropic
streaming_usage.py	stream_reservation() context manager with auto-commit	openai
fastapi_integration.py	FastAPI middleware, dependency injection, per-tenant budgets	fastapi, uvicorn
langchain_integration.py	LangChain callback handler for budget-aware agents	langchain, langchain-openai

Running

# Basic examples (only need a Cycles server)
python examples/basic_usage.py
python examples/decorator_usage.py
python examples/async_usage.py

# Integration examples (need additional API keys)
export OPENAI_API_KEY="sk-..."
python examples/openai_integration.py
python examples/streaming_usage.py

export ANTHROPIC_API_KEY="sk-ant-..."
python examples/anthropic_integration.py

# FastAPI (starts a server on port 8000)
pip install fastapi uvicorn
python examples/fastapi_integration.py

# LangChain
pip install langchain langchain-openai
python examples/langchain_integration.py