Fixes#6140
When a tool returns CallToolResult with multiple content items (e.g.,
both TextContent and ImageContent), the agent was only processing
content[0], ignoring the rest.
Changes:
- Replace direct content[0] access with enumerate(res.content) loop
- Process all content items: TextContent, ImageContent, EmbeddedResource
- Use content_index for image caching to distinguish multiple images
This fixes the issue where tools like Bilibili plugin return both
text descriptions and screenshots, but LLM only received one of them.
ccsang
fb2a2a63f2