> ## Documentation Index
> Fetch the complete documentation index at: https://docs.comet.rpamis.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Tech blog

> Deep technical articles and video introductions for Comet — understand the design decisions behind each release and how to make good use of every capability.

This is Comet's tech blog. Here we explain the reasoning behind each design decision, the thinking behind version evolution, and the practical experience of advanced usage.

## Article index

### Version evolution

| Article                                                                                  | Topic                                                             |
| ---------------------------------------------------------------------------------------- | ----------------------------------------------------------------- |
| [From 0.3.9 to 0.4.0: why Comet rewrote its runtime](/en/tech-blog/comet-0.3.9-to-0.4.0) | runtime rebuild, routing context, Skill platform, eval, Dashboard |

### Methodology and industry comparison

| Article                                                        | Topic                                                                                                       |
| -------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------- |
| [Comet vs. industry practice](/en/tech-blog/comet-vs-industry) | evaluation methodology, runtime and workflow, Skill authoring and distribution, with paper-grade references |

### Evaluation methodology (in depth)

| Article                                                                              | Topic                                                                                        |
| ------------------------------------------------------------------------------------ | -------------------------------------------------------------------------------------------- |
| [Evaluation: the compass for Skill evolution](/en/eval/why-eval)                     | why evaluation should be established first, the basis for rubric, pass\@k, pass^k            |
| [How Comet uses evaluation to drive Skill evolution](/en/eval/eval-driven-evolution) | characteristics of Spec-Coding Skill evaluation, differences from SWE-bench, open challenges |

## Videos

Videos are archived by version. Older videos keep their historical context, and new videos are added to the matching version, so early demos are not misread as current-version documentation.

<Tabs sync={false}>
  <Tab title="0.4.x">
    <Frame caption="Comet 0.4.x video introduction.">
      <iframe src="https://player.bilibili.com/player.html?bvid=BV1mjN36fE68&autoplay=0" title="Comet 0.4.x video introduction" className="w-full h-96 rounded-xl" allowFullScreen />
    </Frame>

    <Card title="Open on Bilibili" icon="circle-play" href="https://www.bilibili.com/video/BV1mjN36fE68/">
      If the in-page player is unavailable, you can open the original video directly.
    </Card>

    <Card title="Read the 0.4.0 design article" icon="book-open" href="/en/tech-blog/comet-0.3.9-to-0.4.0">
      Understand 0.4.0-beta.1 from its architectural motivation, not just from the feature list.
    </Card>
  </Tab>

  <Tab title="0.3.x">
    <Frame caption="Early 0.3.x introduction video. It records Comet's earlier workflow shape, and some content differs from the current 0.4.x capabilities.">
      <iframe src="https://player.bilibili.com/player.html?bvid=BV1y4Gi6CEo1&autoplay=0" title="Comet 0.3.x early introduction video" className="w-full h-96 rounded-xl" allowFullScreen />
    </Frame>

    <Card title="Open on Bilibili" icon="circle-play" href="https://www.bilibili.com/video/BV1y4Gi6CEo1/">
      If the in-page player is unavailable, you can open the original video directly.
    </Card>
  </Tab>

  <Tab title="Short videos">
    <Columns cols={2}>
      <Card title="Douyin short video entry" icon="mobile-screen" href="https://www.douyin.com/search/comet?modal_id=7646429015808936293">
        View short video introductions. Douyin pages may restrict in-site iframe playback, so this is kept as an external entry.
      </Card>

      <Card title="Want to see more demos?" icon="message-circle" href="https://github.com/rpamis/comet">
        If you would like to see demos of `/comet-any` creating a Skill, `comet eval` running an evaluation, or Dashboard troubleshooting, you can open an issue in the GitHub repository.
      </Card>
    </Columns>
  </Tab>
</Tabs>

## More content

<Columns cols={2}>
  <Card title="Changelog" icon="list-check" href="/en/changelog">
    View the complete line-by-line changes for each version.
  </Card>

  <Card title="Understand Comet" icon="route" href="/en/concepts/workflow">
    Start understanding Comet from the core concepts and workflow mechanics.
  </Card>

  <Card title="Compose any Skill" icon="blackberry" href="/en/skill-creator/getting-started">
    Learn how `/comet-any` generates a reusable Skill from an idea.
  </Card>

  <Card title="Evaluate any Skill" icon="vial-circle-check" href="/en/eval/quickstart">
    Use `comet eval` to quantify Skill quality.
  </Card>
</Columns>