Vespper

Vespper is a DOCX MCP server that lets AI agents read and edit Microsoft Word documents while preserving the original styling and formatting. It gives an agent three tools and hides the underlying OOXML structure, presenting a .docx file as HTML for reading and applying the agent's edits back as real Word tracked changes that a person can review and accept. Developers connect it through TypeScript or Python SDKs. A session is opened on a document, the agent is pointed at the hosted MCP endpoint, and any compatible framework such as the Vercel AI SDK or the OpenAI Agents SDK can then drive the edits, for example filling an NDA from the data in a spreadsheet. The vendor publishes benchmark results comparing it with a DOCX skill and an Office CLI MCP on cost, accuracy and latency, along with the methodology. Open source example projects include a Microsoft Word add in, an ONLYOFFICE plugin that proposes edits as suggestion cards, and a browser editor with a chat panel. It is intended for teams building legal, contract and document workflow products on top of agents. The company is backed by Y Combinator. Pricing is by edit volume. Free is $0 a month with 500 edits, one seat and a community Slack channel. Starter is $50 a month, at one cent per edit, with 5,000 edits, two seats and a dedicated Slack channel. Enterprise is custom, with custom edit volume, unlimited seats and white glove onboarding.