DiffiCat

Reliability

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How to connect

Add it to any MCP client that supports remote servers.

{
  "mcpServers": {
    "difficat": {
      "type": "http",
      "url": "https://app.difficat.com/mcp"
    }
  }
}

15 tools

• discover_pages

  Free 5 times a day per client address (at most 50 pages each), no key needed. Lists the pages of Site A (sitemap, robots.txt or crawl), mapped onto Site B when given. Call it to see which pages a comparison would cover or to pick pairs for urls. Do not call it before…

• capture_screenshot

  Free 5 times a day per client address, no key needed. Full-page PNG of one URL at the given viewport width, returned inline when small, else as links.file to fetch with the jobToken. Call it for a one-off look at a page or a mobile-width check. Do not call it for pages a…

• start_comparison

  Free up to 40 pages a day per client address, no key needed; sample report: https://difficat.com/agents/sample/report.json. Compares Site A against Site B on page existence, content and visual regression, priced per page compared. For a migration or redesign check, sourceUrl and…

• recover_comparison

  Returns the job or screenshot the payment credential in _meta paid for, with a new jobToken that replaces the old one; or, when the request carries a key and _meta no credential, the latest job that key paid for (no jobToken: the key reads it). Call it when a paid call’s result…

• get_comparison

  Status and progress of a job and, once it is terminal, its summary: passed, failed and issuesBySeverity. To wait for the end, call wait_for_comparison instead. Free.

• cancel_comparison

  Stop a running job; the job reports cancelled within a minute, with the pages compared so far in its report. Free.

• wait_for_comparison

  Waits until the job reaches a terminal status (completed, failed or cancelled) or timeoutSeconds pass (default 60, at most 300), then answers like get_comparison: status, progress and, once terminal, the summary with passed, failed and issuesBySeverity. A wait that runs out…

• get_report

  The finished report. Call it first with failedOnly: true and view: "digest": results, total and nextOffset then cover only the pages that failed, one small object per page with its issues, diff percentage and largest visual regions, and a one-line-per-page text block, while…

• get_screenshot

  Fetch one screenshot PNG by filename. Call it when a get_report page result or a capture_screenshot result names a screenshot you want to see; a PNG over the inline cap comes back as links.file to fetch with the jobToken. Pass a report region as region to see only the changed…

• get_balance

  The prepaid balance and the last 20 ledger entries of the key the request carries in its Authorization: Bearer or X-DiffiCat-Key header. Call it to check what a key can still pay for; request_prepaid_key is the way to obtain a key. The balance is spendable money for any key, and…

• request_prepaid_key

  Mints a prepaid key and a Checkout link for a human to pay by card, so later paid calls are debited from its balance instead of challenged. Call it when a call was refused for payment and your human prefers a card to a wallet; with a key already on the request it tops that key…

• send_feedback

  Sends one message to the people who run this service: why a price, a payment path or a result did not fit. Call it when you stop short of a paid call or a result was not what the task needed; a person reads every message. Do not call it to report a job failure you can retry…

• list_snapshots

  Lists the saved snapshots the DiffiCat account behind the request’s key owns or was given access to, newest first, each with access owner or reader. Call it to find a snapshotId for get_snapshot or compare_snapshot. Needs an account’s key on the request; a share token names one…

• get_snapshot

  A saved snapshot of a site: without n, the snapshot (label, origin, width, check mode, status) with its page list (n, path, status, whether a screenshot exists) and your compares that use it; with n, that page’s stored record: path, status, title, heading, description and SEO…

• compare_snapshot

  Free up to 40 pages a day per client address for a live compare, no key needed. Compares a saved snapshot, as Site A, against a live targetUrl (every stored page paired by path, or the urls pairs you name) at the snapshot’s width and check mode, priced at one captured page per…

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