Validates common environment fields and returns normalized attributes.

Returns the whole-environment capability view.

Dispatch reads nothing from an environment but :capabilities. A callback handed to a sandboxed evaluation must capture a view rather than the environment itself: spawn does not preserve sharing, so capturing the environment would copy its frozen bundle once per capability callback.

Only the discovery routes need every capability. A callback that dispatches one capability must capture capability_view/2 instead — capturing the whole map from each of them costs the hand-over O(capabilities²), which a tool-rich MCP environment can blow the sandbox setup ceiling with before evaluation starts.

Returns the single-capability view one dispatch callback needs.

Dispatcher.dispatch/8 resolves name against the :capabilities of the value it is given and reads nothing else from it, so a callback bound to one capability can carry only that capability and dispatch identically.

Returns sorted model-visible capability metadata for one environment.