TL;DR
Thorsten Meyer AI introduced Threlmark in a Built in Public Day 7 dispatch as an MIT-licensed roadmap tool built around a local JSON file. The confirmed product pitch is that the kanban board, external tools and agents read and write the same file; claims about lower lock-in and easier interoperability remain tied to how the schema and release mature.
Thorsten Meyer AI has published a Built in Public Day 7 dispatch introducing Threlmark, an open-source MIT roadmap tool built around a plain JSON file on the user’s disk instead of a hosted database, a design choice the project says is meant to reduce vendor lock-in and make roadmaps readable by human tools and AI agents.
The dispatch describes Threlmark’s core contract as roadmap.json, a file the board reads from and writes to. The board is presented as a kanban view over that file, with other programs able to read or update the same JSON without relying on a SaaS API, SDK, webhook or authentication workflow.
According to the source material, the project is available through threlmark.com and is open source under the MIT license. The material also says Threlmark is part of Thorsten Meyer AI’s operator portfolio and the wider Decision Layer series, where IdeaClyst verdicts feed into Threlmark as ordered roadmap items.
The same dispatch says Threlmark uses a scored kanban model. Items carry priority scores, with examples shown for backlog, doing and done columns. The stated aim is to make ranking visible and to avoid a roadmap where all items are treated as equal priority.
Threlmark — disk is the contract
The roadmap is a plain JSON file on your disk. The board is just a view over it — and your tools and your agents read and write the same file directly.
Independent commentary, produced with AI assistance under human editorial oversight. The views are the author’s own and may change. Threlmark is open source under MIT, provided “as is” without warranty; see the repository LICENSE. Automated agents that read and write the roadmap file may introduce errors — treat agent writes as changes to review, not facts to trust. Product and company names are trademarks of their respective owners; mention does not imply endorsement.
Plain-File Roadmap Control
For builders and small teams, the pitch is about control over planning data. If the roadmap remains a plain file, the owner can place it under version control, inspect it in a text editor, move it between tools or build scripts around it. Those benefits depend on the JSON shape remaining stable enough for outside programs to use.
The agent-read/write angle also gives Threlmark a current software-development hook. Many teams are experimenting with AI assistants that can draft tickets, reorder work or act on decisions. Threlmark’s model treats the roadmap file as the shared surface for that work, while the source material warns that agent edits should be reviewed rather than accepted as facts.
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Built in Public Day Seven
The product is framed as Day 7 of a 19-part Built in Public series by Thorsten Meyer AI. The source material places Threlmark after IdeaClyst in a chain of tools: IdeaClyst produces verdicts, while Threlmark turns those verdicts into scored work items.
The dispatch ties the product to three recurring principles in the portfolio: local-first operation, provider-agnostic tooling and non-developer build simplicity. It also includes a standard disclaimer that views are the author’s own, that Threlmark is provided as is under MIT terms, and that product names mentioned belong to their owners.
“disk is the contract”
— Thorsten Meyer AI dispatch
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Schema and Adoption Gaps
The supplied material does not give a repository URL, version number, installation steps, release tag, schema documentation or compatibility guarantees. It is also not clear how Threlmark handles simultaneous edits, malformed JSON, merge conflicts, access controls, backups or validation of agent-written changes.
Adoption is also unknown. The source positions the tool as part of a broader operator system, but it does not provide user numbers, outside contributors, issue activity or examples of third-party integrations already using the roadmap file.
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Release Details Still Ahead
Readers tracking the project should watch for the public repository, schema reference, installation path and examples showing agents or external tools safely updating roadmap.json. Those materials would show whether the file contract is stable enough for broader use beyond the Built in Public series.
The next milestone in the series is not specified in the supplied material, beyond Threlmark being identified as Day 7 of 19. Later posts may clarify how the roadmap file connects to other tools in the portfolio and whether the project is intended for standalone use.
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Key Questions
What is Threlmark?
Threlmark is described by Thorsten Meyer AI as an open-source MIT roadmap tool. Its kanban board reads and writes a local JSON file rather than storing the roadmap behind a hosted service API.
What does disk is the contract mean?
The phrase means the roadmap file itself is treated as the shared agreement between the app, external tools and agents. Any compatible program could read or write the JSON file if it follows the expected shape.
Is Threlmark already available?
The supplied material says Threlmark is open source under MIT and points readers to threlmark.com. It does not include a repository URL, version number or installation instructions.
How does scoring work in the roadmap?
The dispatch says each roadmap item carries a priority score. That score is meant to turn the board from a flat list of tasks into an ordered plan where trade-offs are visible.
What should users be cautious about?
The source material warns that automated agent writes can introduce errors. Users should treat those edits as proposed changes to review, especially until schema rules, validation behavior and collaboration handling are clearer.
Source: Thorsten Meyer AI
