Plan D from docs/superpowers/plans/2026-05-19-post-slm-unlock.md
(static portion; dynamic bandit-driven promotion deferred to D-2).
Routing previously let tier ordering (CLI > local > API) dominate
selection — Opus, in tier 3, would lose to a tier-1 CLI agent for
SecurityReview even though Opus is empirically stronger at that task.
This change introduces explicit per-arm overrides:
[[arms]]
id = "anthropic/claude-opus-4-7"
strengths = ["security_review", "planning"]
cost_weight = 0.3
Strengths gate cross-tier promotion: arms matching task.Type bypass
the tier loop and compete with each other directly. Promotion is a
preference, not a pin — if no strength-tagged arm is feasible
(backoff, pool capacity, tool support), selection falls through to
the default tier order.
CostWeight linearly dampens the cost penalty in scoreArm via
effectiveCost = 1 + CostWeight * (cost - 1)
CostWeight=1.0 (or unset) preserves current behavior; lower values
trade cheapness for quality. The earlier draft used cost^CostWeight
which inverts direction for sub-1 local-arm costs (raising a
fraction <1 to a fractional power makes it bigger, not smaller); a
monotonicity regression test prevents that drift.
- internal/router/arm.go: Strengths []TaskType, CostWeight float64,
HasStrength(), ResolvedCostWeight() (zero → 1.0).
- internal/router/selector.go: scoreArm strength bonus const
(strengthScoreBonus = 0.15) + linear cost dampening; selectBest
cross-tier promotion before tier loop.
- internal/router/router.go: ArmOverride type + ApplyArmOverrides()
returns unknown IDs; unknown strength names skipped with per-name
warning via slog.
- internal/router/task.go: ParseTaskTypeStrict() returns ok bool;
ParseTaskType now delegates so the two switches stay in sync.
- internal/config/config.go: ArmConfig + [[arms]] TOML wiring.
- cmd/gnoma/main.go: applies overrides after all initial arms
register; logs a warning when an [[arms]] id has no matching
registered arm.
Tests cover: predicate helpers, scoring direction across two arms,
linear-formula monotonicity on both sides of cost=1, cross-tier
promotion, empty-Strengths preserves tier order, promoted arm in
backoff falls through via full Router.Select path, observed-quality
tiebreak between two strength-tagged arms, ApplyArmOverrides happy
path + unknown-ID reporting + unknown-strength skipping.
vikingowl
0aabd19906