Two follow-ups from the independent review of #2538.
preflight.py
============
Today: `if per_model_env: required_env = list(per_model_env)` falls
through on `[]`, so a template entry that says "this model needs no
auth" (`required_env: []` — Ollama, llamafile, self-hosted OpenAI-
compat, anything where the SDK doesn't surface a key) is silently
overridden by the top-level fallback list. The template author cannot
express a zero-auth model without lying about its env requirements.
Fix: key off `"required_env" in entry` (key presence, not truthiness).
Missing key still falls back to top-level — that path is unchanged
and preserves "many templates list name/description per model without
enumerating env vars when auth is identical across the family". Empty
list now wins outright. Comment updated to call out the distinction.
test_preflight.py
=================
Renamed `test_per_model_match_with_no_required_env_falls_back_to_top_level`
to `…_no_required_env_KEY_…` and tightened its docstring to reflect
that it's the missing-KEY case only. Added new
`test_per_model_explicit_empty_required_env_means_no_auth` to pin the
new explicit-empty semantic.
test_config.py
==============
New `test_runtime_config_model_env_wins_over_explicit_yaml`. Pins the
intentional precedence inversion shipped in #2538 with both
MODEL_PROVIDER and runtime_config.model in YAML set — MODEL_PROVIDER
wins. Without this pin a future refactor could quietly restore the
old YAML-wins order and re-introduce Bug B.
77/77 targeted tests pass locally.
Closes#250 (review follow-up). Builds on merged #2538.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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