Medium launched a new application on Monday called TK. It places an AI assistant directly inside the writing editor so users can type “@TK” followed by a request to get immediate help.
In traditional publishing, TK is a placeholder for information to be added later. The abbreviation stands for “to come,” but the company uses the letter K rather than C because the “tk” combination is rare in English. This makes the marker stand out clearly during proofreading.
Medium’s version of the tool attempts to fill those blanks automatically. The assistant can answer quick factual questions, such as the number of days in a specific month. It can also retrieve previously saved notes from the user’s account to flesh out ideas.
The company states TK will include specific skills for editorial feedback and headline suggestions. These features aim to match a draft against the style guide for a specific Medium publication.
This integration of AI at the early stages of writing could prove controversial. The publishing and literary sectors have been grappling with the role of artificial intelligence in creating long-form prose. Several authors have lost book deals after suspicions arose that they used AI to write their work. Literary awards have also faced scrutiny after winners were suspected of using such assistance.
Writers have long used automated tools for proofreading and light grammatical edits. However, there is growing concern that an AI assistant’s suggestions can become the final text, rather than reflecting the writer’s own thoughts.
Questions also surround the reliability of AI detection tools. Because these models were trained on human writing, it is difficult to determine when something was written with AI assistance versus written entirely by a human.
TK leans into this debate by suggesting these nuances will ultimately no longer matter. The company celebrates what AI can bring to writing, stating that “artificial intelligence makes writing more important, not less.” It proclaims that AI is a technology with the power to amplify human intelligence and that it uses the written word as a foundation.
Medium concedes that AI raises the possibility of low-quality content and blurs the line between human-written and AI-written text. To address this, TK allows authors to publish notes that transparently explain how AI was used in their work.
“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,” Medium explained in a blog post about the launch.
Beyond writing assistance, TK helps users remember and organise previous work. It suggests writing prompts and can optionally connect to a user’s own AI agent through TK’s MCP server or a Claude skill. This allows the app to better understand projects, positions, and other ideas stored in the agent’s memory.
The new app incorporates human feedback in a social layer, allowing writers to share early drafts with others and receive comments.
At launch, TK is available on the web, but a desktop app is on the roadmap. The application can import and export Markdown, but it is not a Markdown app itself. Writing in TK is not encrypted because the app is designed for collaboration, though users can set access control permissions on their work.
Medium says TK will be a free tool for those with a Medium account.
What it means
Users can now ask for facts, retrieve past notes, and get style checks without leaving the editor. The tool explicitly flags AI usage in the final publication to maintain transparency. The feature is currently free for existing accounts and will not be encrypted, which is a trade-off for its collaborative design.
