# Keep tool schemas clean with accurate parameter descriptions

> Fixed a formatting issue where tool parameter descriptions were incorrectly prefixed with (None) when no type annotation was present.

- Published: 2026-03-10
- Author: Agno Team
- Category: Changelog
- Canonical: https://agno-com-nine.vercel.app/articles/remove-spurious-none-prefix-from-tool-parameter-descriptions
- Markdown: https://agno-com-nine.vercel.app/articles/remove-spurious-none-prefix-from-tool-parameter-descriptions.md

Fixed a formatting issue where tool parameter descriptions were incorrectly prefixed with `(None)` when no type annotation was present. Parameter descriptions now render cleanly in all contexts — tool schemas, AgentOS views, and model prompts — without extraneous noise that could confuse the model or degrade tool call accuracy.

Details**:**

- Removes the `(None)` prefix from parameter descriptions that lack explicit type annotations
- Improves the quality and readability of generated tool schemas
- No changes required; the fix applies automatically to all tools