skill-author/agent-author's #89 retarget needs to know exactly how each
.apm/ primitive compiles to Claude Code and Copilot CLI output. The
existing microsoft-apm corpus only had a full schema for skills and one
minimal example for agents, and nothing for prompts/instructions/hooks.
Deepened via APM's own Python source (not just docs) where prose was
thin. Key finding for #89: agents have no per-target integrator, so
apm compile does a naive verbatim copy to both Claude and Copilot,
unlike prompts/instructions/hooks which each get real per-target
reconstruction. That means the agent primitive's `tools:` field can't
express both harnesses' incompatible vocabularies at once — a real
upstream gap, not something we can schema our way around.
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