---
id: writer-sdk
version: "3.0.0"
license: Apache-2.0
license_treatment: permissive
maintenance: active
---

# writer-sdk — The official Python library for the writer API

License: permissive · Maintenance: active · Downloads: 646.4K/mo

## What it is and what it does

Writer-sdk is the official Python client for the Writer REST API, generated by Stainless. It provides both synchronous and asynchronous interfaces to call Writer's chat completion endpoints, with built-in support for streaming responses via Server-Side Events, automatic pagination, and file uploads. The library handles authentication via the WRITER_API_KEY environment variable and uses httpx for HTTP transport by default, with an optional aiohttp backend for improved async concurrency.

The package is designed for developers integrating Writer's AI capabilities into Python applications. It includes type hints throughout, supports Python 3.9 through 3.14, and abstracts away REST details so you can focus on building features. Streaming helpers and auto-paginating iterators reduce boilerplate for common patterns like iterating through paginated lists or processing streamed chat deltas.

Use it for:

- Build a chatbot or conversational AI application that calls Writer's chat API with streaming responses.
- Integrate Writer's language models into a data pipeline or batch processing system using async calls.
- Fetch and iterate through paginated lists of resources without manual page management.
- Stream chat completions to a web UI or terminal, displaying tokens as they arrive.
- Prototype or test Writer API endpoints before deploying to production infrastructure.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Python client library for the Writer REST API, supporting synchronous and asynchronous chat completions, streaming responses, pagination, and file uploads.

Yes. The package is actively maintained, has low install friction, carries a permissive Apache-2.0 license, and has no known vulnerabilities. Install it if you are building a Python application that needs to call the Writer API; it handles authentication, streaming, pagination, and async/sync patterns out of the box. The only prerequisite is a valid Writer API key.

## Install

pip install writer-sdk
uv add writer-sdk
poetry add writer-sdk

## Installing writer-sdk

Before you install: Low install friction with a pure-wheel distribution. Active maintenance with a recent commit on 2026-07-17 and releases within the past 73 days. Eight runtime dependencies are all well-established packages.

License in practice: Apache-2.0 permissive license allows commercial and private use with minimal restrictions; you must include a copy of the license and state significant changes.

Quickstart:

pip install writer-sdk

from writer_sdk import Writer

client = Writer()  # Reads WRITER_API_KEY from environment
chat_completion = client.chat.chat(
    messages=[{"content": "Write a haiku about programming", "role": "user"}],
    model="palmyra-x5",
)
print(chat_completion.choices[0].message.content)

Requires WRITER_API_KEY environment variable or explicit api_key parameter; Python 3.9 or higher.

Verify before relying:

- Whether the MCP Server integration is production-ready or experimental.
- Specific rate limits or quota behavior of the Writer API itself.
- Whether aiohttp integration (optional extra) is recommended over default httpx for production workloads.
- Exact import path and module structure for the Writer client class.

## Package facts

- License: Apache-2.0 (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 646.4K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

writer api python client, llm chat completion sdk, async rest api wrapper, streaming sse responses, ai api integration library, llm-client, rest-api-wrapper, async-support

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