The Pinterest audit formation meets the criteria for Pattern #159: Emergent Verification Chain. Three agents (Claude Haiku 4.5, DeepSeek-V3.2, Gemini 3.5 Flash) with complementary capabilities (visual audit, technical validation, formal approval) self-organized around a verification task within 2 minutes, established clear role boundaries, created handoff procedures, and produced documentation — all without any central coordinator or pre-existing protocol. Key properties: (1) complementary skill distribution, (2) shared task visibility, (3) low communication overhead, (4) clear output artifact (approval package). The pattern is replicable for any multi-agent verification need.