Jadpo is experimental and not ready for production. These docs follow the compiler's main branch as of 30 Oct 2026. What's built · Install 0.1.0
jadpo
Reference: Project layout and modules

Project layout and modules · rule

toolchain.version_newer

Project is on a later Jadpo line.

Area 1, Project layout and modules; not declinable; the next step is usually the human's.

app.jadpo names the Jadpo release line the project is written for. The installed jadpo runs that line's release for you (Which jadpo runs); a jadpo on an earlier line that can't, because it was told to run everything itself (JADPO_TOOLCHAIN=local) or couldn't fetch the release, refuses the project with this error alone, rather than misread what a later version added:

example
application {    jadpo: "99.0"}
text
error: This project needs Jadpo 99.0 --> app.jadpo:2:12  |2 |     jadpo: "99.0"  |            ^^^^^^ later than this jadpo  reason: `jadpo:` names the release line the project is written for, 99.0, which is later than this jadpo's (`jadpo --version` shows it), so it stops here rather than misread what a later version added.  next: Run it with Jadpo 99.0, which the installed `jadpo` fetches unless `JADPO_TOOLCHAIN` is `local` (human)  rule: toolchain.version_newer  help: https://jadpo.dev/docs/errors/toolchain.version_newercheck failed: 1 error, 1 file

When the installed jadpo couldn't fetch the release, its reason starts with why, and its next step fits: run again once github.com can be reached; name a published line; set XDG_CACHE_HOME when there is no cache folder; or, for a download that failed its SHA-256 or attestation check, run again to fetch it afresh, then install the newest jadpo, whose trusted root may be newer, if it fails the same way. When GitHub's API refuses for its hourly limit, it says so and to run again in an hour.

Markdown for agents: /docs/errors/toolchain.version_newer.md.Built from Jadpo main at a707efb.