fix: fix function param type

[Benjmmi]

Description

PR for the issue #2669

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[Benjmmi]

I think this issue needs to be fixed in playwright/mcp, where there is type: ["string", "null"]. I looked into it and understand that type can be any type, and null means it’s optional—I don’t think we need to handle it. However, the type can be:

• ["string", "null"]
• ["string","integer", "null"]
  ...

[fengju0213]

@Benjmmi thanks for this pr！everything looks good，we just need to place the test files in the tests folder instead of examples

[Benjmmi]

@fengju0213 okok, moved test file to test dir, finished

[fengju0213]

everything looks good ，thanks @Benjmmi ！ I made some minor changes in your PR.
then we can merge it

[waleedalzarooni]

LGTM

[Benjmmi]

@fengju0213 Thank you for the revisions; I have already merge it.