Fast mcp and structured output #3779

Job	Run time
checks / pre-commit	37s
checks / readme-snippets	10s
checks / test (3.10, lowest-direct, ubuntu-latest)	43s
checks / test (3.10, lowest-direct, windows-latest)	2m 2s
checks / test (3.11, lowest-direct, windows-latest)	2m 26s
checks / test (3.10, highest, windows-latest)	2m 6s
checks / test (3.11, highest, ubuntu-latest)	44s
checks / test (3.11, highest, windows-latest)	2m 13s
checks / test (3.11, lowest-direct, ubuntu-latest)	45s
checks / test (3.12, lowest-direct, windows-latest)	2m 53s
checks / test (3.10, highest, ubuntu-latest)	46s
checks / test (3.12, lowest-direct, ubuntu-latest)	44s
checks / test (3.12, highest, windows-latest)	2m 55s
checks / test (3.12, highest, ubuntu-latest)	45s
checks / test (3.13, lowest-direct, ubuntu-latest)	46s
checks / test (3.13, lowest-direct, windows-latest)	2m 40s
checks / test (3.13, highest, ubuntu-latest)	46s
checks / test (3.13, highest, windows-latest)	2m 19s
	26m 20s

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