TL;DR
Threlmark has presented an open-source roadmap tool built around a local JSON file rather than a hosted database or SaaS API. The project says the file serves as the shared contract for the UI, external tools and automated agents, while priority scores turn roadmap items into a ranked kanban board.
Threlmark has been presented as an MIT-licensed, open-source roadmap tool that stores the plan itself in a plain JSON file on the user’s disk, a design choice meant to let humans, tools and automated agents read and update the same roadmap without depending on a hosted API.
The Thorsten Meyer AI Built in Public dispatch describes Threlmark’s central rule as “disk is the contract.” In the project’s model, the kanban board is a view over a local file rather than the source of truth. The source says the roadmap file can be read by other tools and written to by agents because the integration point is the JSON structure itself.
The article says Threlmark is available at threlmark.com and is open source under the MIT license. It presents the project as part of a broader 19-day product series and identifies this installment as Day 7. The source also says Threlmark sits in a “decision layer” alongside IdeaClyst, with IdeaClyst producing verdicts that can become scored items on the roadmap.
Threlmark is described as a scored kanban system. According to the source material, each item carries a priority score so the board is not only a list of work but an ordered plan. The source frames that scoring model as a way to make trade-offs visible when multiple projects compete for attention.
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 Replace SaaS Dependence
The stated value of Threlmark is control over operational planning data. If the roadmap is stored as a user-owned text file, teams are less exposed to vendor pricing changes, API limits, account access issues or product shutdowns. That matters for readers who rely on roadmaps as working records rather than presentation artifacts.
The design also speaks to agent-based workflows. The source says automated agents can read, act on and write to the same roadmap file that the UI uses. That could make Threlmark useful for teams experimenting with AI-assisted planning, provided those agent writes are reviewed before they are treated as reliable changes.
The project’s priority scoring adds another practical claim: ranked cards can reduce vague priority labels. The source argues that a board where every item is high priority has no real priorities. In Threlmark’s model, each item must be placed in relation to other work.
open source JSON roadmap tool
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Day Seven Of Product Series
The Threlmark dispatch is part of Thorsten Meyer AI’s Built in Public series, labeled Day 7 of 19. The source describes an “operator constellation” of 18 products built on a local-first and provider-agnostic foundation. Threlmark is positioned as the place where decisions become an ordered plan.
The relevant prior link in the source material is IdeaClyst, described as a council-like decision product whose verdicts feed Threlmark. The source frames the connection as “IdeaClyst → Threlmark”: one product evaluates what may be worth building, while Threlmark records and ranks the work.
The source includes a disclaimer that the commentary was produced with AI assistance under human editorial oversight. It also states that Threlmark is provided “as is” without warranty under the repository license.
“disk is the contract”
— Thorsten Meyer AI Built in Public dispatch
Agile Project Management with Kanban (Developer Best Practices)
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Adoption And Implementation Details
The source material does not state how many users or contributors Threlmark has, whether the repository is production-ready, or which operating systems and workflows have been tested. It also does not provide benchmarks, security details, sync behavior or conflict-handling rules for cases where multiple tools or agents edit the same file.
It is also not clear from the provided material how strict the JSON schema is, whether validation tools are included, or how Threlmark handles corrupted files and competing writes. Those details will matter if the tool is used in multi-person or agent-heavy planning workflows.
local JSON file project tracker
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Repository And Schema Tests
The next milestone for readers is direct inspection of the Threlmark site and repository, including the file schema, license, install path and examples of agent edits. If the project continues through the Built in Public series, later dispatches may show whether Threlmark remains a standalone local tool or becomes a planning layer used across the wider product portfolio.
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Key Questions
What is Threlmark?
Threlmark is described as an open-source roadmap and scored kanban tool that uses a local JSON file as the source of truth for the roadmap.
What does “disk is the contract” mean?
It means the shared agreement between the UI, tools and agents is the file on disk and its JSON shape, rather than a vendor API or hosted database.
Is Threlmark a SaaS product?
The source material says the roadmap lives on the user’s disk and says there is no SaaS API for the roadmap contract. It points readers to threlmark.com and describes the project as MIT-licensed open source.
Can automated agents update the roadmap?
According to the source, agents can read and write the same roadmap file. The source also warns that agent writes may contain errors and should be reviewed as changes, not trusted as facts.
What remains unknown about Threlmark?
The provided source does not confirm adoption numbers, release status, conflict handling, schema validation, sync features or production testing details.
Source: Thorsten Meyer AI
