research instructed "spawn one subagent per URL" while its allowed-tools granted no spawn tool, so it silently degraded to serial fetches. Three other skills spawn subagents without trouble because they declare no allowed-tools. The defect was the mismatch, not the spawning. ADR-0027 records the agreement rule. research drops allowed-tools and gets its steps 4-5 fan-out and the orchestrator-writes gotcha back (1.0.1 -> 1.1.0). Closes #116 Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EGHFJextYtVQseaHPDDhxB