.opencode/models/models.yaml is now the ONE file humans edit to assign a
model to an agent. tools/sync_models.py regenerates every derived surface
— the .opencode/models/*.txt files, opencode.json's `agent` block, and
each non-tier agent's .md `model:` frontmatter — so an assignment cannot
drift across surfaces. `--check` verifies with no writes and is enforced
in CI by test_model_registry_in_sync_with_manifest.
Hardened after adversarial review:
- Deletes orphan <agent>.txt files left behind when an override is
dropped from the manifest. The dispatcher's resolver reads
<agent>.txt before default.txt, so a stale file would silently pin
the old model. Tier .txt files are left to sync_tier_models.py.
- Rejects a manifest key that does not name a real agent (no matching
.opencode/agents/<name>.md) instead of silently appending a bogus
opencode.json entry and leaving the real agent on the default model.
- Validates the regenerated opencode.json BEFORE writing it, so a bad
render aborts cleanly instead of corrupting the file on disk.
Tier-ladder agents (task-implementor-tier-*) remain governed separately
by tiers.yaml + sync_tier_models.py and are passed through untouched.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
drew
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