TL;DR
Thorsten Meyer AI used Day 7 of its Built in Public series to present Threlmark, an open-source roadmap tool whose central data contract is a local JSON file. The confirmed pitch is that the kanban board, external tools and AI agents all read and write the same file, reducing dependence on a SaaS API.
Thorsten Meyer AI has presented Threlmark, an MIT-licensed, open-source roadmap tool built around a local JSON file instead of a hosted product database, in its Built in Public Day 7 of 19 dispatch, a design choice meant to make project plans readable and writable by users’ own tools and AI agents.
The dispatch says Threlmark’s roadmap lives as a plain JSON file on the user’s disk, while the kanban board is a visual layer over that file. The source material describes this as the product’s central idea: the file format, rather than a vendor API, acts as the shared contract between the app, other tools and automated agents.
According to Thorsten Meyer AI, this means programs that can read JSON can inspect the roadmap, and programs that can write JSON can update it. The dispatch frames the approach as a way to avoid API limits, vendor lock-in and dependence on a hosted roadmap database.
Threlmark is also described as a scored kanban system. Each item carries a priority score, allowing the board to rank work rather than present every card as equal. The dispatch links Threlmark to IdeaClyst, another product in the same 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 for teams and solo operators who want their planning data to remain portable. Many roadmap products store the plan in a vendor-controlled database and expose it through an API. Threlmark’s file-first model shifts that dependency to a local JSON structure that can be versioned, edited and inspected with common developer tools.
The design may also appeal to people building AI-assisted workflows. If agents and human users work against the same file, the roadmap can become a shared operating artifact rather than a status board that must be manually copied into prompts, tickets or spreadsheets. That benefit depends on safe review practices, since the source material warns that automated agent writes can introduce errors.
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IdeaClyst Feeds The Plan
The Threlmark dispatch is part of Thorsten Meyer AI’s Built in Public series, labeled Day 7 of 19. The source material places the product inside a larger “operator constellation” of 18 products, with Threlmark serving as the place where decisions become an ordered plan.
The relevant link in that chain is IdeaClyst to Threlmark. The dispatch says IdeaClyst produces council verdicts, while Threlmark turns those verdicts into scored items. The stated product thesis is local-first and provider-agnostic: the roadmap is a file on the user’s machine, and the contract is a format rather than a vendor service.
“disk is the contract”
— Thorsten Meyer AI dispatch
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Agent Edits Need Review
The source material does not provide a detailed public release timeline, installation steps, repository URL, schema specification or governance model for future changes to the JSON format. It also does not say how Threlmark handles simultaneous edits, file conflicts, validation failures or recovery from malformed agent-written data.
The dispatch says a full deep-dive covers internals, but those details are not included in the provided source. Until those mechanics are documented, the practical limits of multi-tool and agent-driven editing remain open questions.
local JSON roadmap tool
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Repository Details Come Next
Readers following the Built in Public series can expect the next step to be closer inspection of Threlmark’s internals, file shape and integration path. For now, the confirmed status is that the project is presented as open source under the MIT license at threlmark.com, with agent-written changes framed as edits that should be reviewed rather than accepted as facts.
scored kanban system software
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Key Questions
What is the news about Threlmark?
Thorsten Meyer AI has presented Threlmark as an open-source roadmap tool whose core data source is a local JSON file. The dispatch appeared as Day 7 of a 19-part Built in Public series.
What does “disk is the contract” mean here?
It means the roadmap file itself is the shared agreement between the app, other tools and agents. Instead of integrating through a SaaS API, tools interact with a known JSON structure on disk.
Is Threlmark only for developers?
The source material describes the product as simple by design and says any tool that can read or write JSON can interact with the roadmap. It does not provide enough detail to judge how accessible setup will be for non-technical users.
How does scoring work in Threlmark?
The dispatch says every roadmap item carries a priority score, turning the board into a ranked kanban rather than a flat list of tasks. The exact scoring method is not detailed in the provided source.
What risks are mentioned?
The source material warns that automated agents reading and writing the roadmap file may introduce errors. It says agent writes should be treated as changes to review, not facts to trust.
Source: Thorsten Meyer AI
