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- src/lib/assistant/prompts.ts: balanceSuggestionSchema + buildBalancePrompt (system message leads with the grounding constraint; restricts choices to the provided compendium candidates). - useEncounterAdvisor hook: builds context → picks system-correct candidates → asks the LLM (when configured) for a structured pick, validates + filters names to the candidate set, else falls back to the deterministic buildSuggestedEncounter. Apply adds the creatures transactionally via encountersRepo.mutate. - EncounterTipCard in the combat tracker: leads with the detected difficulty tendency (or the current difficulty), offers a one-click grounded suggestion (AI or deterministic) with propose→confirm Apply. prompts unit tests + e2e for both the deterministic apply flow and the AI path (stubbed provider); the AI test also confirms candidate-grounding (only shortlisted creatures survive). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>