feat: prompt AI to use ReadMediaFile for video attachments instead of Python frame extraction

[bj456736]

Problem

When users upload videos as attachments, the system renders them as <video path="..."> tags in the prompt. Previously, the system prompt only provided general guidance about "use proper tools or shell commands or Python packages to process... multimedia files", which often led the AI to write Python scripts to extract frames manually instead of using the built-in ReadMediaFile tool.

This was reported as feedback Q-0266: Kimi CLI 视频分析希望默认调用 ReadMediaFile 而不是写 Python 切帧.

Solution

Added an explicit instruction in the default system prompt (packages/agent-core/src/profile/default/system.md):

When the user uploads a video as an attachment (represented as <video path="..."> in the message), you should use the ReadMediaFile tool to read the video content directly instead of writing Python scripts to extract frames or process it manually.

Why this approach

• Minimal change: Single-line addition to existing system prompt, no code changes needed.
• Leverages existing infrastructure: ReadMediaFile already fully supports video files via the video_in capability and videoUploader.
• Aligns with user intent: The feedback specifically requested that video analysis default to ReadMediaFile rather than Python frame extraction.
• No tests affected: Existing tests for prompt rendering and profile loading continue to pass.

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Latest commit: af2a321

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[pkg-pr-new]

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commit: af2a321