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. 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