diff --git a/agents/AGENTS-claude.md b/agents/AGENTS-claude.md
index b2a48b3..2be0f12 100644
--- a/agents/AGENTS-claude.md
+++ b/agents/AGENTS-claude.md
@@ -41,21 +41,27 @@ Prefix every `Agent` prompt with one of:
 - `[TIER: STANDARD]` — focused implementation logic; minimal preamble
 - `[TIER: DEEP]` — complex reasoning; must conclude with a summary
 
-### Model selection (override only when needed)
+### Model selection (relative to the parent, no fixed names)
 
 Resolution order: explicit `model` param → agent type frontmatter → parent
 inheritance. (`fork` always runs on the parent model; an override is ignored.)
+Model names shift (Opus was the top tier when this was written; Fable and
+Mythos sit above it now), so think in tiers, not names:
 
 0. **Self-hosted backend (a SessionStart hook says so when `ANTHROPIC_BASE_URL`
-   points at the vLLM gateway): never pass `model`.** Aliases like `sonnet`
-   do not exist there; every subagent inherits the one available model.
-1. **Don't override specialized agent types** (`Explore`, `Plan`, etc.) — their frontmatter is tuned. Leave `model` off.
-2. **For `general-purpose` under an expensive parent (Opus/Fable): set `model: sonnet`** — don't pay top rates for routine subagent work.
-3. **`opus`** for research, recommendation, trade-off and judgement work
-   (also blinded eval judges) and when isolated context *and* reasoning beyond
-   the parent's inline capacity are both needed. For "how should X look"
-   questions discuss options first, do not build.
-4. **`model: haiku`** only for mechanical tasks: bulk classification, format conversion, summarizing pre-filtered text. Code-semantic work → Sonnet.
+   points at the vLLM gateway): never pass `model`.** Aliases do not exist
+   there; every subagent inherits the one available model.
+1. **Specialized agent types** (`Explore`, `Plan`, …) keep their frontmatter
+   model. Leave `model` off.
+2. **Routine `general-purpose` work** (mechanical edits, bulk lookups,
+   verification runs): one tier below the parent, today `sonnet`. Don't pay
+   top rates for routine work.
+3. **Judgement work** (research, recommendation, trade-off, review, blinded
+   eval judges): the parent's tier, so pass no `model` and let it inherit.
+   For "how should X look" questions discuss options first, do not build.
+4. **`haiku`** only for purely mechanical tasks: bulk classification, format
+   conversion, summarizing pre-filtered text. Code-semantic work is at least
+   `sonnet`.
 
 ### Context hygiene