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fix: forbid extra arguments in FastMCP tool arg models (#3067)#3068

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elbachir-salik:fix/argmodel-forbid-extra-3067
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fix: forbid extra arguments in FastMCP tool arg models (#3067)#3068
elbachir-salik wants to merge 3 commits into
modelcontextprotocol:mainfrom
elbachir-salik:fix/argmodel-forbid-extra-3067

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Closes #3067
ArgModelBase now uses extra="forbid" so unknown or misspelled tool arguments raise a validation error instead of being silently ignored.
Added a regression test confirming unknown args are rejected.

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No issues found across 10 files

Re-trigger cubic

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FastMCP tool argument models silently ignore unknown/misspelled arguments (extra=ignore default)

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