TL;DR
Thorsten Meyer AI published its Day 7 Built in Public dispatch on Threlmark, an open-source roadmap tool whose core contract is a plain JSON file stored on the user’s disk. The project frames that local file as the shared surface for the kanban board, outside tools and AI agents, while warning that agent-written changes still need review.
Thorsten Meyer AI has introduced Threlmark, an open-source roadmap tool that stores the plan as a plain JSON file on the user’s own disk, a design meant to let humans, tools and AI agents read and write the same project roadmap without depending on a hosted SaaS API.
The Day 7 Built in Public dispatch describes Threlmark’s central product decision as “disk is the contract.” According to the source material, the kanban board is a view over a local roadmap.json file, rather than the primary home of the data. The project is listed as open source under the MIT license and is associated with threlmark.com.
The dispatch says the roadmap file is intended to be readable by any software that can parse JSON and writable by tools or agents that follow the same structure. The claimed benefit is reduced dependency on vendor APIs, authentication flows, rate limits or service availability. Those are product claims from the author’s dispatch; independent adoption, maintenance plans and external integrations were not established in the provided material.
Threlmark is also described as a scored kanban board. Each item carries a priority score, which the dispatch says is meant to make ranking explicit and prevent every task from being treated as equally urgent. The source connects Threlmark to the author’s broader “operator portfolio,” saying verdicts from IdeaClyst can become scored roadmap items in Threlmark.
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.
Local Files Challenge SaaS Roadmaps
The announcement matters because roadmap tools often become systems of record for product decisions, priorities and planned work. When that data lives only behind a hosted product’s API, teams may depend on the vendor’s pricing, access rules, export support and continued operation. Threlmark’s premise is that the roadmap should remain usable even if the interface around it changes.
For developers, operators and AI-assisted workflows, a local JSON file can be easier to inspect, version, diff and automate than data stored only in a remote application. The dispatch frames this as interoperability by default: the file format, not a vendor account, is the integration point. That could appeal to users who want roadmap data to work with scripts, version control, local editors or multiple AI agents.
The same design also creates responsibilities. If agents can write directly to the file, users need review practices, backups and conflict handling. The source material explicitly warns that agent writes should be treated as changes to review, not facts to trust.
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Day Seven in a Product Series
Threlmark was presented as Day 7 in a 19-day Built in Public sequence from Thorsten Meyer AI. The dispatch places it inside what the author calls the “Decision Layer,” linking it to IdeaClyst, another product in the same portfolio.
In that framing, IdeaClyst produces verdicts about what is worth doing, while Threlmark turns those verdicts into an ordered plan. The dispatch describes the movement as “IdeaClyst → Threlmark,” with scored roadmap items serving as the handoff between decision-making and execution.
The post also states that the project follows local-first and provider-agnostic principles. Those are the author’s stated product goals, not independently verified market outcomes. The available source material does not include download counts, outside user reports, a public release history or a list of supported integrations.
“The roadmap is a plain JSON file on your disk.”
— Thorsten Meyer AI Day 7 dispatch
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Adoption and Sync Details Open
Several details remain unclear from the provided source material. The dispatch does not establish how Threlmark handles simultaneous edits, file conflicts, schema migrations, malformed agent writes or multi-device sync. Those issues matter for any tool that treats a local file as the shared contract among people and automation.
It is also unclear how much external use Threlmark has beyond the author’s portfolio, whether the repository has outside contributors, or which agents and tools already support the roadmap file shape. The MIT license status is stated in the source material, but readers would need the repository and license file to verify the exact terms.
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Repository Use Will Test Claims
The next test for Threlmark is whether users and agents can rely on the JSON contract in real workflows without losing clarity, creating edit conflicts or requiring a separate coordination layer. Public repository activity, examples of the file schema and working integrations would help show how the design performs outside the author’s own product series.
The Built in Public sequence is scheduled as a 19-part run, so further posts may clarify how Threlmark connects with the rest of the portfolio and whether its roadmap file becomes a stable interface for other tools.
Task management app with JSON import
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Key Questions
What is Threlmark?
Threlmark is described by Thorsten Meyer AI as an open-source scored kanban roadmap tool. Its roadmap data lives in a local JSON file, with the board acting as a view over that file.
What does “disk is the contract” mean?
It means the shared agreement between the app, outside tools and agents is the file on disk and its JSON structure. The source presents the file format as the integration point instead of a hosted API.
Is Threlmark a SaaS product?
The dispatch describes Threlmark as local-first and says there is no SaaS API for the roadmap contract. The provided material does not rule out future hosted services or companion tools.
Why use scores on roadmap items?
The source says scoring forces ranking, making trade-offs visible instead of treating all cards as equally high priority. That is the product rationale stated in the dispatch.
What should users watch before relying on it?
Users should look for details on schema stability, conflict handling, backups, agent-write review and repository activity. The dispatch warns that automated agent changes may contain errors and should be reviewed.
Source: Thorsten Meyer AI
