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Charles Wiltgen
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The third and last capability the ledger recorded as downgraded, replaced by a static preamble in each agent file. Cursor's subagentStart response accepts additional_context and its query carries subagent_type, which is the only field the canonical hook reads, so the port is a field rename. This is additive, not a replacement. The generated preamble carries an agent's own declared skills; the hook carries the general skill-awareness text gated by agent type. Both now ship. Verified as far as a free Cursor plan allows: the hook registers, fires, and delivers a payload carrying subagent_type, task, and subagent_model — confirmed against a live Cursor 3.17.8 delegation, which fires subagentStart three times before refusing to start the subagent with "Named models unavailable. Free plans can only use Auto." What a free plan cannot show is whether the returned context reaches a subagent that never starts. The docs and the submission matrix say so rather than implying full verification. If delivery does not work, the preamble still carries the declared skills, so the failure mode is the status quo rather than a regression. The context guard needed widening: skill awareness is legitimately multi-paragraph, where the router and crash hints are single-line. Newline and tab are now permitted, every other control character is still rejected, and the bound is separate at 8 KiB.