| Value | Meaning |
|---|---|
| text | |
| image | |
| audio | |
| resourceLink | |
| embeddedResource | |
| toolUse | |
| toolResult | |
| unknown | A content block whose type is not one this SDK models (e.g. a future or vendor-specific kind). Stored verbatim so it round-trips losslessly instead of being coerced into empty text. |
The kind of a content block.
toolUse/toolResult are the sampling content blocks added by the 2025-11-25 / draft tool-enabled sampling revisions (ToolUseContent / ToolResultContent in the schema); they appear inside sampling/createMessage messages and results, not in tool/prompt content.