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Two consequences of moving the agent plane behind presets, both invisible until the host plane stopped carrying model-facing rows. `sessions.fork` built its child with a bare `installTarget` and a `meta` without `agentPreset`. That was harmless while every tool sat in the host plane — the child inherited them for free. It now comes up with an EMPTY tool set. The child composes the parent's preset instead, for the same reason a resumed session keeps its own: the seeded history was produced under those tools. `bashEnv` lives in its own `dsh-bash-env` row rather than inside `tool-bash`, so a preset that isolates the realm must compose the provider beside its consumer; the host row is disabled here like every other model-facing one. Nothing outside the agent plane injects `bashEnv`, so it stays per-session.