Dev MCP: Don't set empty params

[phillip-kruger]

fix #50316

@myfear - Can you test against this PR ? I could not recreate the issue, I tried in the test case, but that all works.

[myfear]

Dug a little deeper: cursor/cursor#3614
A spec violation by Cursor's JSON RPC implementation it seems.

Cursor sends: "parameters": "{}" (string)
Expected: "parameters": {} (object)

[phillip-kruger]

I can not recreate this with cursor:

Version: 1.7.17
VSCode Version: 1.99.3
Commit: 34881053400013f38e2354f1479c88c9067039a0
Date: 2025-09-29T03:10:26.099Z
Electron: 34.5.8
Chromium: 132.0.6834.210
Node.js: 20.19.1
V8: 13.2.152.41-electron.0
OS: Linux x64 6.16.8-200.fc42.x86_64

My cursor successfully fetched the tool list and successfully called method with and without parameterrs.

[myfear]

Still reliably can. Seems to be an ARM problem

Version: 1.7.17 (Universal)
VSCode Version: 1.99.3
Commit: 34881053400013f38e2354f1479c88c9067039a0
Date: 2025-09-29T03:10:26.099Z (1 day ago)
Electron: 34.5.8
Chromium: 132.0.6834.210
Node.js: 20.19.1
V8: 13.2.152.41-electron.0
OS: Darwin arm64 25.0.0

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