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The key had two incompatible meanings running at once. CLAUDE.md §3 defines subagents as "keys of other specs this may DELEGATE to" and §6 as a tool call from the parent's perspective — the subagent runs its own turn, as the same caller, out of the parent's budget, and returns an answer. The backend implements exactly that. This side did something else: agentSkillIds folded one level of subagent skills into the parent's carried set, so a parent silently gained everything its subagents carried, and the UI described it that way — "other agents whose skills this one may also use", "borrowing them cannot reach data this page does not hold". Both are defensible readings. Only one is the specification, and running both meant krow-workforce-agent carried eight delegation tools AND the flattened skills of those same eight agents — able to answer a question directly or to ask an agent that had already lent it the means to answer. Two ways to do one thing, differing in cost and in what the trajectory records. So an agent carries what it declares. Reaching another agent is delegation, which the runtime does with its own budget and its own trajectory. The blast radius was one check, which is the useful part of the answer: only "a subagent cycle terminates" depended on the folding, because that traversal was the only thing that could loop. Nothing walks subagents here now, so the cycle question moved to where it belongs — refused at publish by definition.FindSubagentCycle, bounded at run time by the depth cap. The replacement checks assert the new meaning rather than deleting the old ones, because the previous behaviour reads as perfectly reasonable and will be reinvented otherwise. The `agents` parameter stays on agentSkillIds and is no longer read. Removing it is a wider edit for no behavioural gain, and agentScopedDisabledWith exists precisely to pass it. 924/924 checks pass; production build clean. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PJvibeSc1JYXjatankqM1g