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## Why MCP requests that need human input, including browser sign-in, must be handled by the root thread. Subagents need guidance to hand these blockers to their parent without prompting the user or automatically accepting requests that require input. ## What changed - Reject interactive MCP elicitations and tool approval prompts in subagents with guidance to ask the parent and wait before retrying. - Recognize browser authentication and `codex_requires_user_input` metadata even when the form schema is empty, while preserving automatic permission approvals and review decisions. - Carry user-interaction eligibility through MCP runtime creation and connection reuse, and guard prompt registration. - Preserve connector authentication diagnostics alongside handoff guidance, subject to normal tool-output limits. ## Testing Add unit and integration coverage for blocked subagent prompts, root browser authentication, automatic approval and review, connection reuse, and authentication diagnostic preservation and truncation. Add a request-history snapshot for browser-auth handoff guidance. GitOrigin-RevId: 83e146b6e5c1a2a22a34681ad45615f504b3c96c