Fast mcp and structured output #4014

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	30s
checks / test (3.11, lowest-direct, ubuntu-latest)	47s
checks / test (3.12, highest, windows-latest)	4m 14s
checks / test (3.12, highest, ubuntu-latest)	55s
checks / test (3.10, lowest-direct, ubuntu-latest)	47s
checks / test (3.11, highest, ubuntu-latest)	48s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.12, lowest-direct, windows-latest)	3m 18s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 11s
checks / test (3.11, highest, windows-latest)	2m 28s
checks / test (3.13, highest, windows-latest)	2m 21s
checks / test (3.11, lowest-direct, windows-latest)	2m 29s
checks / test (3.10, highest, windows-latest)	3m 5s
checks / test (3.10, highest, ubuntu-latest)	45s
checks / test (3.13, lowest-direct, ubuntu-latest)	42s
checks / test (3.14, highest, ubuntu-latest)	1m 8s
checks / test (3.10, lowest-direct, windows-latest)	2m 10s
checks / test (3.14, lowest-direct, windows-latest)	2m 16s
checks / test (3.13, lowest-direct, windows-latest)	2m 53s
checks / test (3.13, highest, ubuntu-latest)	46s
checks / test (3.14, highest, windows-latest)	2m 13s
	36m 47s

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