Medium announced TK this week in a launch post by CEO Tony Stubblebine. The company describes it as a private, agentic notebook for writing and thinking.
Medium says the first version of TK includes a designed writing experience, daily prompts, a mobile app, mobile widgets for capturing voice and text, instant import of previous Medium writing, and imports from tools such as Bear and Obsidian. The company also says TK can import and export Markdown, including an entire archive.
The AI features are built into the writing flow. Medium says TK ships with AI skills for editorial feedback, headline feedback and matching a draft with the style guides of Medium publications. It can also summarize a search, topic, tag or Library into a wiki-style page, and it ships with an MCP server and a Claude skill so an AI agent can work with accessible TK material.
Availability details are slightly uneven. The Verge reported that TK is available free on web, Android and iOS, while TechCrunch reported web availability at launch and described a desktop app as on the roadmap. Google Play lists an Android app from A Medium Corporation, updated on Nov. 4, 2026. Medium’s own launch post says the first version has a mobile app and mobile widgets, and separately says it does not yet have a native desktop app.
Private blogging changes the publishing default
The Verge reported that Stubblebine sees TK as part of a wider response to shrinking referral traffic from search engines and chatbots.
Medium’s traditional product starts with publication: a story goes out to readers, followers, search engines and paying members depending on settings and distribution. TK starts earlier, with shared Libraries built around a topic or project where members can read, react and comment. The Verge described examples such as book projects, recipe sharing and poetry drafts visible only to the people in the group.
Medium’s launch post says TK ships with three open Libraries: Public Journal, Get Feedback on Your Writing, and Write a Book. The company’s larger claim is that writing improves when feedback comes before public performance. That may appeal to writing circles, newsletter operators, teams drafting knowledge-base material and creators who want comments from a small group before sending work to a public audience.
For publishers and small teams, the change is not only social. A private library connected to an assistant can turn old notes, half-finished drafts and group feedback into reusable context. It can also concentrate more unpublished material inside one cloud service, which makes access control, export quality and AI permissions more than minor settings.
AI is built into the draft, not bolted onto publication
TechCrunch focused on TK’s in-editor assistant, which can be called with “@TK.” Medium says a writer can use it in the middle of a draft to ask for information or pull from earlier writing, instead of switching to another tool.
The useful part, if it works well, is retrieval. A writer does not have to remember which note contained a half-finished idea. The risk is the same one attached to any AI-assisted notebook: the assistant’s summary, memory or source use needs to be checked before the output becomes a public article, client deliverable or business document.
Medium’s rules for AI-assisted writing
Medium’s AI policy, updated Nov. 11, 2026, says AI-generated writing is not allowed to be paywalled in the Partner Program. It also says undisclosed AI-generated writing receives Network Only distribution and is not eligible for wider distribution. Medium requires disclosure when a story incorporates AI assistance and says undisclosed AI-assisted text is restricted to the author’s network. It excludes tools such as outlining and spelling, grammar or fact checkers from its definition of AI-generated writing. AI-generated images need identifying captions.
TK’s provenance feature is relevant in that context. Medium says TK allows notes to be published with transparency about what was human-written and what was AI-written, including prompting and source material. The policy and the product are not the same thing, but they point in the same direction: AI assistance is being accepted as part of the writing process while disclosure and distribution rules become more visible.
For site owners and content teams, the publishing lesson is familiar. AI can support outlines, research organization and editing, but weak automated output can still damage trust and search performance. Tech Help Canada has covered that tradeoff in its guide to AI-generated content and search-quality risk.
Private does not mean secret
Medium makes several privacy and control claims about TK. In its launch post, the company says no AI company trains on writing or uses it without permission, and that users set access-control permissions for how and when writing is shared. Google Play’s data safety section, based on developer declarations, says the Android app shares no data with third parties, may collect personal info, files and docs, and app activity, and encrypts data in transit.
Those claims need to be read narrowly. TechCrunch reported that TK relies on access controls for collaboration. Medium’s launch post and the Google Play listing do not establish that notes are end-to-end encrypted. In-transit encryption, private sharing and end-to-end encryption are different technical promises. A non-public notebook may be fine for drafts, journals or writing groups while still being a poor fit for passwords, legal files, health information, unreleased financial material or confidential client work.
What to watch next
TK is early enough that the next few product decisions will define whether it becomes a serious writing workspace or a companion tool for Medium users. Four areas are worth watching.
- Access and pricing: The Verge and TechCrunch report TK is free, but product access, AI limits and plan details can change after launch.
- Portability: Medium says TK imports and exports Markdown, including entire archives. The practical test is whether exports preserve structure, links and context well enough to leave later.
- Provenance: TK’s AI transparency claims will matter more if notes move from private libraries into public Medium posts.
- Security expectations: Writers and teams will need to decide whether access controls are enough for their material or whether end-to-end encryption is required.
Medium’s own shorthand is that TK is the gym and Medium is the stage. TK is a bet that the next version of blogging may depend less on search traffic and more on small groups, stored knowledge and controlled access.
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