OpenCode Go and OpenCode Zen are flat-namespace model resellers — their
/v1/models returns bare IDs (deepseek-v4-flash, minimax-m2.7), and the
inference API rejects vendor-prefixed names with HTTP 401 'Model not
supported'. Two bugs fixed:
1. `switch_model` in hermes_cli/model_switch.py was silently switching the
user off opencode-go to native deepseek when they typed
`/model deepseek-v4-flash`. Step d found the model in opencode-go's live
catalog, but step e (detect_provider_for_model) still ran and matched
the bare name against deepseek's static catalog. Fix: track whether
the live catalog resolved it; skip step e when it did.
2. `normalize_model_for_provider` in hermes_cli/model_normalize.py only
stripped the exact `opencode-zen/` prefix, leaving arbitrary vendor
prefixes like `minimax/minimax-m2.7` (commonly copied from aggregator
slugs into fallback_model configs) intact — causing HTTP 401s when
the fallback chain activated. Fix: opencode-go/opencode-zen strip ANY
leading vendor prefix because their APIs are flat-namespace.
Tests: 11 new cases in tests/hermes_cli/test_opencode_go_flat_namespace.py
covering both normalization (prefix stripping, regression guards for
opencode-zen Claude hyphenation and openrouter vendor-prepending) and
switch_model (bare-name resolution on opencode-go's live catalog must
not trigger cross-provider hijack).
Reported by @Ufonik via Discord; Kimi K2.6 always worked because moonshotai
has no overlapping entry in a native provider's static catalog. Deepseek
and minimax failed because their v4/v2.7 names existed in the native
deepseek/minimax catalogs.
