A single conversation turn with a role and a list of typed content parts.

Content is always a list of tagged tuples, mirroring the Anthropic API's multi-part message format. An assistant message may contain both text and tool calls interleaved.

Content part types

• {:text, text} — plain text
• {:image, data, mime_type} — binary image data with MIME type
• {:image_url, url} — image referenced by URL
• {:file, data, mime_type} — binary file/document (PDF, etc.)
• {:video_url, url} — video referenced by URL (Google Gemini only)
• {:tool_call, id, name, args} — a tool call emitted by the model
• {:tool_result, id, result} — the result of executing a tool call
• {:thinking, text} — extended thinking / reasoning block

Examples

iex> %Planck.AI.Message{
...>   role: :user,
...>   content: [{:text, "What is the weather in Lisbon?"}]
...> }