What every consumer needs from a content block, answered by the block itself.

Normandy.Components.ContentBlock.Text, Image and Document implement it, so the adapter, the token counter, the window manager and the summarizer call the protocol instead of switching on the block structs. A new block type implements the three functions and every consumer handles it.

Raw Anthropic block maps (%{"type" => "text", ...}) are not blocks in this sense; consumers pass them through or read them as data.