Add prominent warning block that the Agent tool is not exposed to sub-agents (foreground or background). Rewrite Shape A (orchestrator handoff) from "valid pattern" to "confirmed anti-pattern, removed in v2.4.0". Correct Composition section: background + subagents is NOT supported — nested spawn from a sub-agent silently fails. Source: github.com/anthropics/claude-code/issues/19077 Confirmed empirically 2026-04-19. BREAKING CHANGE: Catalog consumers that cited Shape A should migrate to orchestrating from the main command context instead. |
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