The Medium TK AI writing app launched Monday, Nov. 9, bringing an AI assistant directly into the writing editor. The free tool helps writers develop ideas, retrieve notes and receive feedback without switching between applications.
Medium designed TK as a private notebook for drafting, organizing research and improving written work. Writers can invoke its assistant by typing “@TK” followed by a question or instruction.
The company introduced the service in its official launch announcement. TK is accessible through the web at tk.xyz and is free for users with a Medium account.
How the Medium TK AI Writing App Works
TK places AI assistance inside the document rather than in a separate chatbot window. Writers can request information, locate previous notes or ask for editorial suggestions while drafting.
For example, someone preparing an article can ask TK to retrieve a paragraph written earlier. The assistant can also answer straightforward questions without requiring the writer to open another browser tab.
TK includes dedicated tools for editorial feedback and headline suggestions. It can also compare drafts against style guidelines used by Medium publications.
The app supports writing prompts based on previously saved material. This allows writers to revisit unfinished ideas and connect related notes.
Medium CEO Tony Stubblebine described TK as a tool intended to support human thinking rather than replace it. The company wants writers to remain responsible for their work while using AI for assistance.
TK Combines Note-Taking With AI Memory
Beyond drafting, TK provides tools for organizing information accumulated across multiple writing projects. Users can import existing Medium posts and Markdown documents.
Medium also supports importing material from note-taking services such as Bear and Obsidian. Writers can export individual notes or their complete archives in Markdown format.
TK can generate summaries of saved topics, tags and collections. These summaries include links to the original notes, helping users trace information back to its source.
The platform also supports connections to external AI agents through a Model Context Protocol server and a Claude skill. These integrations allow supported agents to access relevant information stored in TK.
Human collaboration is another feature. TK includes shared libraries where users can exchange drafts and provide feedback before publication.
Medium has introduced spaces for personal journaling, early manuscript feedback and book-writing projects. These communities give unfinished work an audience without requiring immediate public publication.
Medium Introduces AI Writing Transparency Features
TK arrives during an ongoing debate about AI-assisted authorship. Publishers increasingly face questions about where editorial assistance ends and machine-generated writing begins.
Medium is addressing that distinction through optional transparency features. TK allows writers to publish notes explaining how AI contributed to a document.
The company says these disclosures can include prompts and supporting source material. It aims to make the writing process easier for readers and editors to examine.
The issue has become especially sensitive in book publishing. Canadian publisher Boréal recently ended its relationship with novelist Thélyson Orélien following an investigation into alleged AI use. Orélien disputed claims that AI generated his prose.
Another controversy involved author Mia Ballard’s novel Shy Girl. Its planned publication was canceled following allegations concerning AI-generated text. Ballard denied knowingly using AI to write the book.
An analysis of the Ballard case raised concerns about AI detection results and whether authors can verify edits made by collaborators.
In July, a separate publishing deal involving Jerry Falade collapsed after his literary agents questioned the manuscript’s development history. Falade denied using AI to write the novel.
These disputes illustrate why documenting a manuscript’s development matters. However, voluntarily disclosing AI assistance does not establish whether every passage was written independently or is factually accurate.
AI Detection Raises Questions About Authorship
Publishers are also reconsidering how they evaluate work suspected of containing AI-generated passages. An October CNN report on AI detectors and literary prizes examined the growing scrutiny surrounding automated authorship assessments.
These concerns extend beyond publishing. An NPR report on AI in schools provides another perspective on the challenges facing educators and students.
Questions about attribution also extend to factual accuracy. The Atlantic previously examined AI-related writing controversies, including a book containing fabricated or misattributed quotations.
Medium’s approach emphasizes disclosure rather than treating every form of AI assistance as equivalent. TK provides tools for recording how a document was developed, although writers remain responsible for their published work.
TK Availability, Privacy and Future Plans
TK is free for anyone with a Medium account. The service supports web access and mobile note capture, while a native desktop application remains on its roadmap.
Medium says outside AI companies cannot train on users’ writing without permission. However, TK does not use end-to-end encryption because its design supports collaboration between people and AI agents.
Writers can control access permissions when sharing documents. The company also supports exporting notes in Markdown, allowing users to move their work elsewhere.
Other productivity developers are expanding AI assistance into everyday writing. TechAmerica recently covered Fireflies’ AI dictation feature, which helps users create formatted text across desktop applications.
Medium has not announced a paid subscription specifically for TK. Its initial release focuses on writing assistance, reusable notes and feedback from both AI systems and other writers.
The app’s central distinction is how it places AI within the writing process itself. Whether writers embrace that approach will depend partly on how well TK supports their work without obscuring authorship.
