Comma

Share a Claude Desktop artifact

Claude Desktop is very good at producing the artifact you actually wanted: a working dashboard, a comparison table, a chart with real interactivity, a write-up that is structured rather than a wall. It renders in a panel in a desktop app, on one machine, for one person.

The usual escape routes all lose something. A screenshot loses the interactivity and half the table. Copy-pasting into a doc loses the layout. Saving the file and emailing it produces an attachment that opens as a blank page from someone's downloads folder — see why an HTML file won't open if you have watched that happen.

Let Claude publish it

Add Comma's MCP server to claude_desktop_config.json with a scoped token and restart the app:

{
  "mcpServers": {
    "comma": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://commareports.com/api/mcp",
        "--header",
        "Authorization: Bearer comma_sk_…"
      ]
    }
  }
}

Then just ask: "publish that as a report and give me the link." Claude calls the tool with the artifact's HTML and hands back a URL. If you would rather not ask every time, put the instruction in your project instructions and every artifact ends with a link.

Why a URL beats an exported file

  • It opens. No downloads folder, no "this file may be dangerous", no file:// path where every relative asset 404s.
  • It stays interactive. Sandboxed allow-scripts without allow-same-origin — the chart works, and it cannot reach the reader's session — see interactive HTML reports.
  • Comments land on the number. Someone highlights the Q3 column and says it's stale, and the thread stays there — see commenting on HTML.
  • Claude can read the replies over the same MCP server, so "fix what people flagged" is a prompt rather than a transcription job — see letting an agent respond to comments.
  • Updating keeps the link. Ask for a revision on the same report and the URL you already shared still resolves.

Worth knowing

  • Scope the token to reports:write unless you want Claude replying in threads — see scoped tokens for AI agents.
  • Publish private, then widen. An artifact built from a file you uploaded may contain more of that file than you remember — see sharing & access control.
  • HTML body: 5 MB, which covers essentially every artifact that isn't carrying embedded video.
  • Nothing re-executes. A published artifact is a snapshot. If the data behind it should refresh on a schedule, that is a routine.

Try it

Comma is free — unlimited reports, unlimited commenters, unlimited revision history.

Set up Claude Desktop →

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