Mirascope

Mirascope — Clean LLM API Wrapper

Overview

Mirascope is a Python library that provides a clean, decorator-based interface to LLM APIs (OpenAI, Anthropic, Google, Groq, Cohere, etc.) with first-class Pydantic integration, streaming support, and automatic structured extraction. Its philosophy is to stay close to the provider APIs while eliminating boilerplate. Works with async, sync, streaming, and structured output with zero extra configuration.

GitHub: https://github.com/Mirascope/mirascope (1k+ stars)

When to Use

• Clean, minimal LLM wrapper without heavy framework overhead
• Provider-agnostic code that can switch between OpenAI/Anthropic/Groq
• Structured extraction with Pydantic without manual JSON parsing
• Streaming LLM responses in sync or async Python
• Function calling/tool use across multiple providers uniformly

Installation

pip install mirascope[openai]
# Or
pip install mirascope[anthropic]
pip install mirascope[google-generativeai]
pip install mirascope[groq]

Key Patterns / Usage

Basic Chat Completion

from mirascope.core import openai, prompt_template

@openai.call("gpt-4o-mini")
@prompt_template("What is the capital of {country}?")
def get_capital(country: str): ...

response = get_capital(country="France")
print(response.content)  # "The capital of France is Paris."

System Prompt + User Message

from mirascope.core import openai, Messages

@openai.call("gpt-4o-mini")
def summarize(text: str) -> Messages.Type:
    return [
        Messages.System("You are a concise summarizer. Reply in 1-2 sentences."),
        Messages.User(f"Summarize: {text}"),
    ]

result = summarize("Long article text here...")
print(result.content)

Anthropic Provider

from mirascope.core import anthropic

@anthropic.call("claude-3-5-haiku-20241022")
@prompt_template("Explain {concept} simply")
def explain(concept: str): ...

response = explain(concept="quantum entanglement")
print(response.content)

Structured Extraction with Pydantic

from mirascope.core import openai
from pydantic import BaseModel

class BookInfo(BaseModel):
    title: str
    author: str
    year: int
    genre: str

@openai.call("gpt-4o-mini", response_model=BookInfo)
@prompt_template("Extract book info: {text}")
def extract_book(text: str): ...

book = extract_book(text="The Great Gatsby by F. Scott Fitzgerald, published 1925, a literary classic.")
print(book.title)   # "The Great Gatsby"
print(book.year)    # 1925
print(type(book))   # 

Streaming

from mirascope.core import openai, prompt_template

@openai.call("gpt-4o-mini", stream=True)
@prompt_template("Write a short story about {topic}")
def stream_story(topic: str): ...

for chunk, _ in stream_story(topic="a robot learning to paint"):
    print(chunk.content, end="", flush=True)
print()

Async Support

import asyncio
from mirascope.core import openai, prompt_template

@openai.call("gpt-4o-mini")
@prompt_template("Translate '{text}' to {language}")
async def translate(text: str, language: str): ...

async def main():
    result = await translate(text="Hello world", language="Spanish")
    print(result.content)  # "Hola mundo"

asyncio.run(main())

Tool Use / Function Calling

from mirascope.core import openai, BaseTool

class SearchWeb(BaseTool):
    """Search the web for information."""
    query: str
    
    def call(self) -> str:
        return f"Search results for: {self.query}"

@openai.call("gpt-4o", tools=[SearchWeb])
@prompt_template("Answer: {question}")
def answer_with_tools(question: str): ...

response = answer_with_tools(question="What happened in AI news today?")
if response.tool:
    tool = response.tool
    result = tool.call()
    print(result)

Multi-Turn Conversation

from mirascope.core import openai, Messages
from mirascope.core.openai import OpenAIMessageParam

@openai.call("gpt-4o-mini")
def chat(history: list[OpenAIMessageParam], user_message: str) -> Messages.Type:
    return [
        *history,
        Messages.User(user_message),
    ]

history = []
while True:
    user_input = input("You: ")
    response = chat(history=history, user_message=user_input)
    print(f"AI: {response.content}")
    history += response.message_param_stack

Provider Switching

# Switch providers by changing the decorator — same function body
from mirascope.core import openai, anthropic, groq

# OpenAI
@openai.call("gpt-4o-mini")
@prompt_template("What is {x} + {y}?")
def add_openai(x: int, y: int): ...

# Anthropic
@anthropic.call("claude-3-5-haiku-20241022")
@prompt_template("What is {x} + {y}?")
def add_anthropic(x: int, y: int): ...

# Same logic, different provider

Common Pitfalls

• Provider-specific features: some features (extended thinking, Anthropic system prompts) need provider-specific handling
• Response model validation: Pydantic validation errors bubble up — add try/except for production
• Streaming + structured output: streaming with response_model is supported but returns partial objects; use carefully
• Tool call handling: always check response.tool before calling; it's None if model didn't call a tool
• History management: conversation history grows indefinitely; implement truncation for long conversations

Related Skills

• instructor — alternative for structured extraction (more retry logic)
• litellm-proxy — unified proxy with provider switching
• structured-output-extraction — general structured extraction patterns
• claude-api-skill — direct Anthropic SDK usage

GitNexus Index

tool: mirascope
category: llm-client
tier: library
interface: python-sdk
platform: cross-platform
stars: 1000+

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: UltronCore
• Source: UltronCore/claude-skill-vault
• License: MIT

Install and usage instructions live in the source repository linked above.