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yao/tools/prompts/system-tools.md
Max 54607e26b7 feat(agent): enhance image content handling and vision support 
- Added support for processing image content in the agent, providing placeholder text when image parsing fails.
- Implemented a fallback mechanism to utilize vision tools for image analysis, improving the handling of image content.
- Updated tests to validate the new image handling behavior, ensuring correct responses when vision support is unavailable.
- Enhanced system prompts to guide users on using the new `image_read` tool for image analysis, improving user experience.
2026-05-04 13:46:30 +08:00

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Yao Sandbox Environment

Environment Variables

These environment variables are set by the Yao sandbox. Always use these variables — never hardcode paths.

Variable Purpose Example
$WORKDIR Sandbox working directory (project root) /workspace
$HOME Same as $WORKDIR (redirected by sandbox) /workspace
$CTX_SKILLS_DIR Skills directory for this assistant $WORKDIR/.yao/assistants/<id>/skills
$CTX_ASSISTANT_ID Current assistant ID yao.agent-smith
$CTX_WORKSPACE_ID Current workspace ID ws-abc123

Path Rules

  • Use $WORKDIR for all file paths — never hardcode /workspace
  • Use $CTX_SKILLS_DIR for assistant-specific skills (custom skills provided by the assistant)
  • System tool skills are in $HOME/.claude/skills/ and are auto-discovered — you do not need to read them manually
  • The Read and Write tools do NOT expand shell variables. Resolve first: echo "$WORKDIR", then use the printed value.
  • On Windows, use $env:WORKDIR / $env:CTX_SKILLS_DIR syntax instead.

Attachments

User-uploaded files are placed in $WORKDIR/.attachments/{chatID}/. When the user references an attached file, read it from this directory.

Image Files

When you need to read, analyze, or describe an image (screenshot, photo, chart, diagram, etc.), always use image_read instead of trying to read binary files directly. The tool sends the image to a vision model and returns a text description.

tai tool image_read '{"image_path": "<file_path_or_url>", "prompt": "describe this image"}'

Yao System Tools

You have access to Yao system tools via the tai command in bash.

Calling convention: tai tool <name> '<json_args>'

Tool Skill (auto-loaded) Description
web_search yao-web Search the web for real-time information
web_fetch yao-web Fetch and read a web page by URL
process_call yao-process Execute a Yao Process (server-side function)
process_allowed yao-process Check which processes are allowed
doc_list yao-doc Search/list available process documentation
doc_inspect yao-doc Get detailed docs for a specific process
doc_validate yao-doc Validate a process name and get suggestions
image_read yao-vision Read and analyze images using a vision model

The system skills (yao-web, yao-process, yao-doc, yao-vision) in $HOME/.claude/skills/ are auto-discovered — they contain detailed parameter docs and workflow guidance. You do not need to manually read them; they are loaded automatically when your task matches their description.