Medium has launched TK, a free web writing application that puts an AI assistant directly inside the editor. A writer can type `@TK` with a request instead of moving to another browser tab, ask for editorial or headline feedback and retrieve material saved earlier in a project.
The name comes from the publishing placeholder “TK,” used to mark information that will be added later. Medium is applying the same idea to questions, missing details and draft development. The app can also connect to a user’s own agent through an MCP server or Claude skill so it can draw on stored projects and positions.
AI assistance in publishing remains contentious because suggestions can become the prose itself and text detectors are unreliable. TK lets authors attach notes explaining how models contributed, including prompts and source material. Medium presents that record as a step toward transparent and inspectable provenance rather than pretending the human-versus-machine boundary is always clear.
The app also includes a social layer for sharing early drafts and receiving human feedback. It imports and exports Markdown, although it is not itself a Markdown editor. Work is not encrypted because collaboration is part of the design, but access controls are planned. TK is available now on the web for Medium account holders, with a desktop application on the roadmap.