Medium’s new TK app brings AI assistance directly into the writing process

Medium on Monday launched TK, a new writing app that places an AI assistant directly inside the editor. Users invoke it by typing "@TK" followed by a request, aiming to cut down on the tab-switching writers typically do while drafting.

The name is a piece of publishing jargon: "TK" is a placeholder used by journalists to mark information that still needs to be filled in, standing for "to come" — with a K instead of a C because the letter pair is rare in English, making it easy for proofreaders to spot. In Medium's app, the term takes on a new role, with the assistant helping users fill in those blanks.

Medium says the assistant can handle quick lookups that would otherwise interrupt a draft, such as how many days are in a given month, and can pull back in passages the user previously saved to the app while ideas were still forming. The company also says TK will ship with specific skills, including editorial feedback, headline feedback, and one that checks a draft against the style guide for Medium publications.

The launch arrives as publishing and literary circles are still grappling with AI's place in long-form prose. Multiple authors have lost book deals over suspicions they used AI to write, and literary awards have faced scrutiny over winners suspected of AI assistance. A related worry is that an assistant's editorial "suggestions" can end up becoming the text itself rather than reflecting the writer's own thinking — while the reliability of AI detection tools remains in question, since models were trained on human writing.

Medium nonetheless takes an affirmative stance, arguing that "artificial intelligence makes writing more important, not less" and that AI "has the power to amplify human intelligence and it uses the written word as a foundation." The company does concede that AI raises the risk of low-quality content and of blurring the line between human- and AI-written work; to address that, TK lets authors publish notes explaining transparently how AI was used in their writing.

What to watch is whether transparency notes satisfy publishers and award bodies, or whether readers and editors will still demand proof of human authorship — and whether an assistant that starts as a helper becomes, for some drafts, the primary author.

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