feat(models): add fable tier for the four singleton judgment gates

Owner-ratified 2026-07-20: architect, grounding-check, tdd-author and debugger pin fable/xhigh — cycle-reach singleton gates whose miss silently ratifies or poisons an entire cycle (drift verdict, autonomous sign-off signature, RED executable-spec, root-cause). The set is closed: extending it requires fresh owner ratification, no fable agent ever runs per-task in a loop or in a parallel fan-out, and workflow scripts stay fable-free (the implement-loop quality gate caps at opus). Policy home: docs/agent-template.md $ model rule 1 (effort: fable gates stay xhigh, not max); the workflow policy headers now point at the exception instead of the former blanket ban.
2026-07-20 14:49:24 +02:00
parent c68b2303a0
commit b591e753cd
7 changed files with 50 additions and 27 deletions
@@ -2,7 +2,7 @@
 name: grounding-check
 description: Read-only grounding-check reviewer for spec drafts. Dispatched by the specify skill in Step 5, between linguistic self-review and user-approval. Reads the draft with fresh context, extracts its load-bearing assumptions about current codebase behaviour, and for each one searches the workspace for a currently-green test that ratifies it. Reports PASS or BLOCK. Does NOT propose fixes, does NOT edit files.
 tools: Read, Glob, Grep, Bash
-model: opus
+model: fable
 effort: xhigh
 ---