- No No-gos section. The pitch template asks for one — it is what keeps the appetite honest.
Problem
The configuration system landed in cycle 37 (pitch-370009, #1391). Using it
turned up three things that were wrong with the driver around it, which OngChia
filed on 24.08.2026 as issue-79be09, issue-28b2f7 and issue-f89c58:
do_prep_adv was a DriverConfig parameter although it is not a choice: it
is required whenever tracer advection is on, so the user had to keep two
settings consistent by hand.- Output came out one time step early and never included the initial condition,
because the monitor asked whether the next step was an output step rather
than the current one.
- The CLI could read only ICON-generated JSON namelists, had no tests, and
exposed
enable_output and output_mode as options that could silently
override the YAML driver configuration.
None of this reached the cycle-38 betting table, where OngChia appears only as
support on other people's rows. It is nonetheless what he worked on during the
cycle, so it is written here as a bet of its own.
Appetite
Two weeks. Three bounded fixes against a config system that is already built.
Solution
One PR per issue, each described in the issue it answers.
Rabbit holes
The CLI rework (#1466) is the only one of the three that is not a contained fix:
it removes the legacy JSON path and moves the f90-to-yaml conversion out to
scripts, so it changes how everyone invokes the driver.
No-gos
Progress