Model roles

rematch makes model calls through omp, under named roles. It reads them from the profile’s config/roles.yml first, then from omp’s config.yml.

Roles

Role	Used for	Falls back to
rematch-editor	proposals, and the reflector	slow → default
rematch-classifier	labelling redirects	smol → tiny → default
rematch-solver	batch rollouts	default

There is no judge role. A reply from a different provider or model than the role names is a failed run, never a fallback (DESIGN §9).

In omp’s config.yml

~/.omp/agent/config.yml (the agent dir’s), with <repo>/.omp/config.yml as overlay:

modelRoles:
  rematch-editor: <provider>/<strongest model>
  rematch-classifier: <provider>/<fast model>

Per machine: roles.yml

With a profile, profile/config/roles.yml is read before config.yml:

editor:                       # rematch-editor; also classifier, solver, or any modelRoles key
  default: anthropic/claude-opus-5-5
  Vincent-M5M.local: openai/gpt-5     # this hostname only
classifier: fakeprov/small-model      # every machine

The shape is {<role>: <selector> | {default: <selector>, <hostname>: <selector>}}.

Check what resolved

rematch doctor --text           # role rematch-editor: … (via profile:rematch-editor)
rematch profile status --text   # this machine's roles

Improver files

The prompts and tables the binary uses are files you may edit too:

Files	editor.md, composer.md, reflector.md, classifier.md, lint.toml, domain_rules.toml, omp-no-tools.yml
Shipped in	the binary; written to ~/.rematch/improver/ on first run
On upgrade	refreshed only if the installed copy still matches the previously shipped hash (.shipped/<name>)
Override	REMATCH_IMPROVER=<dir> takes them from that directory instead
With a profile	an edited file syncs through profile/improver/

The system never amends them (D25).