Summary

• Replace the nested tool-call count marker with a neutral compass icon and minimum-width count slot.
• Tune the nested marker spacing, color, and icon weight so it aligns with reasoning/tool status rows.
• Add a browser-dev /nested-preview mock command for visual review of nested tool rows.

Validation

• npm run typecheck
• npm run check:css
• pnpm exec tsx src/__tests__/typography-overflow-contract.test.ts

Cache Impact

• No provider-visible prompt, tool schema, or request serialization changes.