fix(mcp): surface tool failures and structured content #2786

Job	Run time
static-analysis	49s
test (2/4)	1m 0s
test (3/4)	42s
build	13s
test (4/4)	37s
test (1/4)	58s
test (one-process pollution detector)	0s
eslint	2s
prettier	2s
typecheck	3s
build-and-test	4s
test (src)	4s
	4m 34s

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