{"name":"CLAUDE_CODE_EXPERIMENTAL_OBSERVER_AGENTS","slug":"claude-code-experimental-observer-agents","family":"env","title":"Environment variables","noun":"environment variable","description":"When true, turns on observer agents: an agent definition's `observer` field names another agent type that is paired with it, with an optional `observerMessage`, and the pairing fans out to the agent's subagents unless `observeSubagents` is `false`. Also needs the `tengu_observer_agents_enabled` flag (default on), and fan-out needs `tengu_observer_subagent_fanout` (default on); one further internal check can turn it off.","description_source":"code","described_by":{"bundle":"2.1.286","author":"claude-opus-5-5"},"presence":{"first_seen":"2.1.200","removed_in":null,"in_current_build":true,"newest_mined":"2.1.309","builds":98,"mined_builds":150,"first_cited":null},"aliases":[],"entries":[{"version":"2.1.200","anchor":"observer-agents-gradual-rollout","heading":"Observer Agents [Gradual Rollout]","line":null,"released_at":"2026-07-03 04:33:49","reason":"found in this entry's text"}],"entries_total":1,"docs":[],"docs_total":0,"gates":[],"related":[{"name":"CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS","slug":"claude-code-experimental-agent-teams","description":"Set to `1` to enable [agent teams](\/docs\/en\/agent-teams). Agent teams are experimental and disabled by default"}],"url":"https:\/\/changelogs.core-directive.com\/reference\/env\/claude-code-experimental-observer-agents","family_url":"https:\/\/changelogs.core-directive.com\/reference\/env.json"}