Image & PDF Support

// Images - automatically base64-encoded
handle.send_input("What's in screenshot.png?").await?;

// PDFs - automatically base64-encoded
handle.send_input("Summarize quarterly-report.pdf").await?;

// Multiple files
handle.send_input("Compare design-v1.png and design-v2.png").await?;

pub enum ToolResultData {
    Text(String),                    // Regular text files

    Image {                          // PNG, JPEG, GIF, WebP
        data: Vec<u8>,
        media_type: String,          // "image/png", etc.
    },

    Document {                       // PDF files
        data: Vec<u8>,
        media_type: String,          // "application/pdf"
        description: String,
    },
}

// First request: Image cached
handle.send_input("Analyze screenshot.png").await?;

// Second request within 5 min: Cache hit (90% savings)
handle.send_input("What colors are used in screenshot.png?").await?;

let input = r#"Analyze this error:
<vibe-work-attachment>./error.png</vibe-work-attachment>"#;

handle.send_input(input).await?;