Key points
- Medium launched TK on Monday, an AI writing app where users type "@TK" plus a request inside the editor to get help.
- TK ships with skills for editorial feedback, headline feedback and matching drafts to Medium publication style guides.
- Authors can publish notes explaining how AI was used; the app can also connect to a user's own agent via an MCP server or Claude skill.
- TK is web-only at launch, with a desktop app on the roadmap, and is free for anyone with a Medium account.
Why it matters for marketers: Medium is building AI disclosure into the drafting tool itself, a model content teams can borrow as readers and publishers push for clearer proof of how AI shaped a piece.
Medium has launched TK, a new writing app that places an AI assistant inside the editor. Users call it by typing "@TK" followed by a request, for example a quick fact lookup that would otherwise mean switching tabs. It can also pull in earlier notes saved in the app, suggest writing prompts and help organize past work.
The app includes skills for editorial feedback and headline feedback, and can check a draft against the style guide of a Medium publication. It can optionally connect to a user's own AI agent through an MCP server or Claude skill, so it can draw on projects and positions stored in that agent's memory. A social layer lets writers share early drafts and collect human feedback.
The launch lands amid debate in publishing over AI in long-form writing. TechCrunch notes that some authors have lost book deals over suspected AI use, and that AI detection tools are of uncertain reliability. Medium's answer is transparency: authors can attach notes describing how AI was used. The company calls this a start toward making the provenance of writing "clear, transparent, and inspectable."
For marketers and content teams, the useful part is the disclosure model. Teams that publish AI-assisted work may soon face questions from readers, clients or platforms about process, and a built-in record of prompts and source material is easier than reconstructing it later. The style-guide matching also points to AI feedback tied to house rules rather than generic edits.
TK is web-only for now, with a desktop app planned. It imports and exports Markdown, but writing in it is not encrypted because the app is built for collaboration; users can set access permissions. Teams handling sensitive drafts should weigh that before adopting it. Medium says the tool is free for account holders.
Sources
This brief is our own summary. Read the full reporting at the source.