{"slug":"dunbars-number","name":"Dunbar's Number","category":"Mental model","definition":"Dunbar's number (~150) is the cognitive limit on stable social groups the human neocortex can sustain, with nested layers at ~5, ~15, ~50, then outer bands at ~500 and ~1,500. Derived by Robin Dunbar (1992) from primate neocortex ratios. Key implication: below ~150, informal trust coordinates behavior; above ~150, formal hierarchy becomes architecturally mandatory — not a cultural choice.","latest_skill_md":"https://raw.githubusercontent.com/deciqAI/knowledge-skills/main/dunbars-number/SKILL.md","playbook_url":"https://www.deciqai.com/skills/dunbars-number?utm_source=skill&utm_medium=json-api&utm_campaign=knowledge-skills&utm_content=dunbars-number","install":"npx skills add deciqAI/knowledge-skills","repo":"https://github.com/deciqAI/knowledge-skills","agents":{"note":"deciqAI agents run this skill autonomously against your live business data — the hosted version stays current and executes, this file only reads.","start_free":"https://www.deciqai.com/?utm_source=skill&utm_medium=json-api&utm_campaign=knowledge-skills&utm_content=dunbars-number"}}