{"version":"2.1.285","anchor":"enterplanmode-rejected-up-front-for-sub-agents","canonical_anchor":"enterplanmode-rejected-up-front-for-sub-agents","heading":"Subagents get a clear refusal when they try to enter plan mode","tier":"notice","area":"Subagents","url":"https:\/\/changelogs.core-directive.com\/v\/2.1.285\/e\/enterplanmode-rejected-up-front-for-sub-agents","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.285","markdown":"### Subagents get a clear refusal when they try to enter plan mode\n\nAsking to enter plan mode from a subagent is now refused up front with \"Only the main session can enter plan mode.\"\n\n**Unclear.** It is not clear whether subagents can still see the `EnterPlanMode` tool at all.\n\n**What**\n\nPlan mode is a mode where Claude plans its work for your approval before making changes. Only your main session can enter it, not a subagent (a helper that Claude starts to handle part of a task). Before, a subagent trying to enter plan mode caused an internal error while the `EnterPlanMode` tool ran. Now the request is checked before it runs and refused with the message \"Only the main session can enter plan mode.\"\n\n**Why**\n\nThe subagent now gets a clean, readable refusal instead of a crash-style error, so it can carry on with its task.\n\n- Area: Subagents\n- Names: `EnterPlanMode`\n- Tier: You'll notice\n- Useful: 3\/5\n- Signal: 1\/5"}