@spec content(t()) :: {:ok, [Dagger.LLMContentBlock.t()]} | {:error, term()}

The message's content blocks, in the order the model produced them.

@spec id(t()) :: {:ok, String.t()} | {:error, term()}

A unique identifier for this LLMMessage.

@spec origin(t()) :: {:ok, Dagger.LLMMessageOrigin.t() | nil} | {:error, term()}

Who put this message on the record, when it arrived through an agent mailbox.

Null for the user's own prompts and for everything the model or tools produced.

@spec role(t()) :: {:ok, Dagger.LLMMessageRole.t()} | {:error, term()}

The role that produced this message.

@spec token_usage(t()) :: Dagger.LLMTokenUsage.t()

Token usage reported by the provider for the API call that produced this message; all zeros except on assistant responses.