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Look the tool schema up by name for Mcp-Param-* validation instead of running tools/list #4441

Job	Run time
checks / readme-snippets	12s
checks / docs	1m 47s
checks / test (3.12, locked, windows-latest)	2m 17s
checks / test (3.10, lowest-direct, windows-latest)	2m 7s
checks / test (3.11, lowest-direct, windows-latest)	2m 12s
checks / pre-commit	1m 0s
checks / test (3.13, locked, windows-latest)	2m 21s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 50s
checks / test (3.10, locked, windows-latest)	2m 50s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 38s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.10, locked, ubuntu-latest)	1m 56s
checks / test (3.13, lowest-direct, windows-latest)	2m 21s
checks / test (3.11, locked, ubuntu-latest)	1m 23s
checks / test (3.12, locked, ubuntu-latest)	1m 59s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 26s
checks / test (3.13, locked, ubuntu-latest)	1m 14s
checks / test (3.14, lowest-direct, windows-latest)	1m 26s
checks / test (3.11, locked, windows-latest)	2m 34s
checks / test (3.12, lowest-direct, windows-latest)	1m 35s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.14, locked, ubuntu-latest)	1m 31s
checks / test (3.14, locked, windows-latest)	2m 24s
all-green	2s
	40m 27s