cerul-tech-news-verifier

name	cerul-tech-news-verifier
description	Verify whether claims in technology-news videos are likely true, false, misleading, or unsupported by searching video speech, visuals, and on-screen text with Cerul MCP. Use when the user asks whether a tech-news claim from a video is fake news, asks to fact-check a video segment, or asks for timestamped visual evidence from a video.

Cerul Tech News Video Verification

Use the configured Cerul MCP server for video-grounded evidence. The available Hermes tool names are expected to be:

• mcp_cerul_cerul_search
• mcp_cerul_cerul_usage

Workflow

1. Parse the user's claim and any video URL, title, speaker, company, product, date, or timestamp hint.
2. Call mcp_cerul_cerul_search with a focused query for the exact claim.
   • Prefer ranking_mode: "rerank".
   • Prefer include_answer: true when the user asks for a judgment, not only search results.
   • Use max_results: 5 by default; increase only when evidence is thin.
   • If the user supplies a YouTube/source URL or speaker/date constraints and the MCP tool supports filters, pass them as filters.
3. Inspect returned snippet, transcript, title, url, speaker, timestamp_start, timestamp_end, thumbnail_url, and especially keyframe_url.
4. Decide the verdict conservatively:
   • 正确: the video evidence directly supports the claim.
   • 错误: the evidence directly contradicts the claim.
   • 误导: part of the claim is true but context, timing, scope, or wording changes the meaning.
   • 证据不足: Cerul results do not contain enough relevant evidence.
5. Return timestamped evidence and frame images. For each evidence item include:
   • source title and URL
   • timestamp range, formatted as HH:MM:SS-HH:MM:SS or MM:SS-MM:SS
   • the relevant quoted/paraphrased evidence from transcript or on-screen visual description
   • keyframe_url as the frame image; render it as Markdown image when possible: ![证据帧](KEYFRAME_URL)
6. If keyframe_url is missing, use thumbnail_url only as a fallback and clearly label it as preview image rather than timestamp frame.
7. If the user asks to save the frame locally and a terminal/file tool is available, download the keyframe_url into the working directory with a descriptive filename and return the local path.

Output Shape

Use this compact structure in Chinese:

结论：正确 / 错误 / 误导 / 证据不足

依据：
1. [标题](url) 时间戳 `MM:SS-MM:SS`
   证据：...
   ![证据帧](keyframe_url)

判断理由：...

注意：如果证据来自视频片段，只说明该视频片段能支持/反驳什么；不要把它扩展成没有证据支撑的全局事实。

Reliability Rules

• Do not invent timestamps or frame URLs.
• If timestamp fields are null, say that Cerul did not return a timestamp for that evidence.
• Treat Cerul as video evidence search, not a universal fact database. For high-stakes or current claims, combine video evidence with web/source verification when available.
• Never expose the Cerul API key in responses, logs, or generated files.