[enhancement] Keep MCP tool property descriptions visible when inputs are filled

[shapkarin]

Problem

Tool property descriptions are rendered as input placeholders so they are hidden when an input has a default value or has been manually filled.

Why this matters

• It’s useful to see them while debugging even when a field has a value.
• The inputSchema tells an MCP client or agent how to call a tool correctly.
• Field descriptions are important because they explain to agent what each argument is for.

How to reproduce:

1. When a property has a default value, only the value itself is visible:

2. We have to remove the value to see the description:

Evn

MCP Inspector v0.21.2

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related issue #1389