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Two A2A-protocol agents (an editor and a fact-checker) both modify a shared document. Without coordination they produce conflicting edits (the editor rewrites a sentence the fact-checker flagged, losing the flag; the fact-checker later re-flags, starting a loop). Naive mutex doesn't work because both agents need concurrent read+write.
A CrewAI crew of 5 specialist agents (researcher, writer, editor, fact-checker, SEO) duplicates work: the researcher produces a draft, the writer re-researches, the fact-checker re-fetches sources already fetched. Shared memory is configured but seemingly ignored.