WRITER

All functionality related to WRITER

This page covers how to use the WRITER ecosystem within LangChain. For further information see Writer docs. Palmyra is a Large Language Model (LLM) developed by WRITER.

The Writer API is powered by a diverse set of Palmyra sub-models with different capabilities and price points.

Installation and Setup

Install the integration package with

pip

pip install langchain-writer

Get a WRITER API key and set it as an environment variable (WRITER_API_KEY)

Chat model

from langchain_writer import ChatWriter

See details.

PDF Parser

from langchain_writer.pdf_parser import PDFParser

Deprecation notice: The parse PDF tool is deprecated and will be removed on December 22, 2025.

Migration path: We plan to introduce a prebuilt PDF parsing tool for chat completions that will provide similar functionality. This tool will work similarly to other prebuilt tools. We will provide more details about this alternative when it becomes available.

See details.

Tools calling

Functions

Support of basic function calls defined via dicts, Pydantic, python functions etc.

Graphs

from langchain_writer.tools import GraphTool

See details.

Web search tool

from langchain_writer.tools import WebSearchTool

See details.

Translation tool

from langchain_writer.tools import TranslationTool

See details.

---

Edit the source of this page on GitHub.

Connect these docs programmatically to Claude, VSCode, and more via MCP for real-time answers.