Cache tool parameter inputs locally for ease of repetitive testing of same tool

[pamelafox]

Is your feature request related to a problem? Please describe.

A common way that I use the MCP dev inspector is for repetitive testing of a tool with the same values. Currently I have to re-fill in the tool input parameters each time the server re-connects, which gets annoying after many reloads.

Describe the solution you'd like

I suggest using localStorage to remember the tool input parameter values. The localStorage key could be a hash of the server + toolname + input parameter names.

Describe alternatives you've considered

• sessionStorage: not persistent enough
• local database: too much setup, inspector already uses localStorage

Additional context

I don't think you'd fill up localStorage with the keys, but if you were worried about that, you could set an expiration using my lscache library:
https://github.com/pamelafox/lscache

[matteo8p]

Hey! I put up a PR here
https://github.com/modelcontextprotocol/inspector/pull/646/files

[pamelafox]

Awesome, thanks for that! The code looks good to me.