{"version":"2.1.84","anchor":"agent-list-in-system-messages-gradual-rollout","canonical_anchor":"agent-list-in-system-messages-gradual-rollout","heading":"Agent List in System Messages [Gradual Rollout]","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.84\/e\/agent-list-in-system-messages-gradual-rollout","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.84","markdown":"### Agent List in System Messages [Gradual Rollout]\n\n**What**\n\nAgent type descriptions can be injected directly into system-reminder messages instead of only in the Task tool description.\n\n**Status**\n\nFeature-flagged via `tengu_agent_list_attach` (default: false). Can be overridden with `CLAUDE_CODE_AGENT_LIST_IN_MESSAGES` environment variable.\n\n**Details**\n\n- When enabled, available agent types are listed in `<system-reminder>` messages in the conversation\n- Agent type descriptions use the format: `- agentType: whenToUse (Tools: toolList)`\n- This helps models discover available agent types more reliably\n\n**Evidence**\n\nAgent list feature (gated by `tengu_agent_list_attach`, search for `\"CLAUDE_CODE_AGENT_LIST_IN_MESSAGES\"`)\n\n- Flag `tengu_agent_list_attach`: Off in both readings (read for one account on one subscription tier against v2.1.84; this account: off, anonymous baseline: off, compiled default: no gate table built for this version) These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release."}