Fast mcp and structured output #3846

Job	Run time
checks / pre-commit	36s
checks / readme-snippets	11s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
checks / test (3.10, lowest-direct, windows-latest)	2m 7s
checks / test (3.10, highest, windows-latest)	2m 59s
checks / test (3.11, highest, ubuntu-latest)	46s
checks / test (3.10, highest, ubuntu-latest)	45s
checks / test (3.11, lowest-direct, ubuntu-latest)	41s
checks / test (3.11, highest, windows-latest)	2m 28s
checks / test (3.12, lowest-direct, windows-latest)	3m 39s
checks / test (3.11, lowest-direct, windows-latest)	2m 21s
checks / test (3.12, lowest-direct, ubuntu-latest)	46s
checks / test (3.13, lowest-direct, ubuntu-latest)	43s
checks / test (3.13, highest, ubuntu-latest)	47s
checks / test (3.12, highest, ubuntu-latest)	48s
checks / test (3.12, highest, windows-latest)	3m 14s
checks / test (3.13, lowest-direct, windows-latest)	2m 38s
checks / test (3.13, highest, windows-latest)	2m 19s
	28m 34s

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