Fast mcp and structured output #3841

Job	Run time
checks / pre-commit	33s
checks / readme-snippets	15s
checks / test (3.10, lowest-direct, ubuntu-latest)	48s
checks / test (3.10, highest, ubuntu-latest)	47s
checks / test (3.10, highest, windows-latest)	2m 7s
checks / test (3.12, lowest-direct, windows-latest)	3m 18s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.12, highest, ubuntu-latest)	54s
checks / test (3.11, highest, windows-latest)	2m 22s
checks / test (3.11, lowest-direct, windows-latest)	2m 34s
checks / test (3.12, lowest-direct, ubuntu-latest)	55s
checks / test (3.10, lowest-direct, windows-latest)	2m 7s
checks / test (3.12, highest, windows-latest)	3m 13s
checks / test (3.13, highest, ubuntu-latest)	48s
checks / test (3.11, highest, ubuntu-latest)	43s
checks / test (3.13, lowest-direct, ubuntu-latest)	47s
checks / test (3.13, highest, windows-latest)	2m 43s
checks / test (3.13, lowest-direct, windows-latest)	2m 25s
	28m 5s

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