Fast mcp and structured output #3898

Job	Run time
checks / readme-snippets	13s
checks / test (3.11, lowest-direct, ubuntu-latest)	47s
checks / test (3.10, highest, windows-latest)	2m 29s
checks / test (3.10, highest, ubuntu-latest)	46s
checks / test (3.11, lowest-direct, windows-latest)	2m 38s
checks / test (3.13, lowest-direct, windows-latest)	2m 44s
checks / test (3.12, highest, windows-latest)	3m 23s
checks / test (3.12, highest, ubuntu-latest)	51s
checks / test (3.12, lowest-direct, windows-latest)	3m 26s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / pre-commit	37s
checks / test (3.11, highest, windows-latest)	2m 45s
checks / test (3.11, highest, ubuntu-latest)	46s
checks / test (3.13, highest, windows-latest)	2m 54s
checks / test (3.10, lowest-direct, ubuntu-latest)	44s
checks / test (3.13, highest, ubuntu-latest)	45s
checks / test (3.10, lowest-direct, windows-latest)	2m 11s
checks / test (3.12, lowest-direct, ubuntu-latest)	49s
	29m 33s

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