Add MCP proxy helper #1758

Job	Run time
checks / readme-snippets	13s
checks / pre-commit	34s
checks / test (3.10, locked, windows-latest)	2m 56s
checks / test (3.10, lowest-direct, windows-latest)	3m 10s
checks / test (3.11, lowest-direct, windows-latest)	3m 1s
checks / test (3.10, lowest-direct, ubuntu-latest)	45s
checks / test (3.11, locked, windows-latest)	3m 25s
checks / test (3.12, lowest-direct, windows-latest)	4m 14s
checks / test (3.11, lowest-direct, ubuntu-latest)	49s
checks / test (3.13, locked, windows-latest)	2m 35s
checks / test (3.12, locked, ubuntu-latest)	51s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.13, lowest-direct, windows-latest)	2m 47s
checks / test (3.10, locked, ubuntu-latest)	52s
checks / test (3.12, lowest-direct, ubuntu-latest)	54s
checks / test (3.13, lowest-direct, ubuntu-latest)	46s
checks / test (3.14, lowest-direct, windows-latest)	2m 29s
checks / test (3.13, locked, ubuntu-latest)	44s
checks / test (3.14, locked, ubuntu-latest)	2m 17s
checks / test (3.11, locked, ubuntu-latest)	47s
checks / test (3.14, locked, windows-latest)	3m 29s
checks / test (3.12, locked, windows-latest)	3m 39s
all-green	5s
	42m 40s

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