[v1.x] fix: make MCP errors pickle-safe #4354

Job	Run time
checks / pre-commit	29s
checks / test (3.12, lowest-direct, windows-latest)	2m 28s
checks / test (3.11, highest, ubuntu-latest)	50s
checks / test (3.13, lowest-direct, ubuntu-latest)	47s
checks / test (3.10, highest, windows-latest)	2m 12s
checks / test (3.14, lowest-direct, ubuntu-latest)	56s
checks / test (3.11, lowest-direct, windows-latest)	2m 41s
checks / test (3.10, lowest-direct, windows-latest)	2m 27s
checks / test (3.13, highest, windows-latest)	3m 49s
checks / test (3.12, lowest-direct, ubuntu-latest)	51s
checks / test (3.10, highest, ubuntu-latest)	50s
checks / test (3.10, lowest-direct, ubuntu-latest)	54s
checks / test (3.13, highest, ubuntu-latest)	48s
checks / test (3.14, lowest-direct, windows-latest)	2m 2s
checks / doc-snippets	14s
checks / test (3.13, lowest-direct, windows-latest)	2m 13s
checks / test (3.11, highest, windows-latest)	2m 40s
checks / test (3.14, highest, windows-latest)	2m 11s
checks / test (3.12, highest, ubuntu-latest)	48s
checks / test (3.12, highest, windows-latest)	2m 37s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.14, highest, ubuntu-latest)	1m 13s
checks / docs	17s
all-green	6s
	35m 7s

Navigation Menu