Key facts
- Medium said TK lets users call the AI assistant by typing "@TK" followed by a request or prompt.
- Medium said TK will ship with skills for editorial feedback, headline feedback and matching drafts to publication style guides.
- Medium said TK lets authors publish notes explaining how AI was used in their writing.
- Medium said TK can optionally connect to a user's own AI agent through its MCP server or Claude skill.
- Medium said TK is free for those with a Medium account and is available on the web at launch.
- Medium said TK writing is not encrypted but users can set access control permissions on their work.
Online publishing platform Medium launched a writing app called TK on November 9, 2026, bringing an AI assistant into the editor itself. Users call the assistant by typing "@TK" followed by a request or prompt, the company said.
Medium said TK will ship with skills for editorial feedback, headline feedback and matching a draft to the style guide of Medium publications. The app can also pull in writing a user previously saved while developing ideas, and it suggests writing prompts and helps organize earlier work.
TK can optionally connect to a user's own AI agent through the app's MCP server or Claude skill, so the app can draw on projects and positions stored in that agent's memory, Medium said. A social layer lets writers share early drafts with others for feedback.
Medium said TK is available on the web at launch, with a desktop app on its roadmap. The app imports and exports Markdown but is not itself a Markdown app, and writing in TK is not encrypted because the app is designed for collaboration, though users can set access control permissions.
Medium said TK will be free for those with a Medium account. The company is profitable, according to the report.
Addressing concern about AI's role in long-form prose, Medium said TK lets authors publish notes that explain how AI was used. In a blog post about the launch, Medium said: "This is a start of what we believe is required to publish in the AI era, which is to make the provenance of writing clear, transparent, and inspectable, right down to the prompting and source material." The company also said "artificial intelligence makes writing more important, not less."