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dev.workers.perch-app.kestrel/kestrel

by kestrel.perch-app.workers.dev · remote · no sign-in to list tools · v1.0.0 · published by dev.workers.perch-app.kestrel

Watch any URL for changes: baseline, then check for a diff. Free, no signup/key.

Deletes · 1Changes · 2
CompareRegistry entry

4 tools: 1 can delete or cancel things, 2 change things and 1 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http kestrel https://kestrel.perch-app.workers.dev/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

4 tools

Deletes or cancels 1Claude Code: deny
  • delete_watchStop monitoring a page and delete the watch.No findings

    Why it is in this group

    • The name "delete_watch" says "delete": a word for removing or ending something.
    Description, as the server wrote it
    Stop monitoring a page and delete the watch.
Changes things 2Claude Code: ask
  • check_watchRe-fetch a watched page and report whether it changed since the last check, with a short list of added/removed content lines.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Re-fetch a watched page and report whether it changed since the last check, with a short list of added/removed content lines. Updates the baseline to the new content. Call this every time you want the latest status (e.g. each run/heartbeat).
  • create_watchStart monitoring a web page (or JSON/text URL) for changes.No findings

    Why it is in this group

    • The name "create_watch" says "create": a word for a change.
    Description, as the server wrote it
    Start monitoring a web page (or JSON/text URL) for changes. Captures a baseline snapshot now. Returns a watch_id and a token — save the token; it's how you check and manage your watches later. Pass an existing token to add more watches under the same account.
Only reads 1Claude Code: allow
  • list_watchesList all watches under your token, with per-watch check/change counts.No findings

    Why it is in this group

    • The name "list_watches" says "list": a word for reading.
    Description, as the server wrote it
    List all watches under your token, with per-watch check/change counts.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http kestrel https://kestrel.perch-app.workers.dev/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__kestrel__list_watches"
    ],
    "ask": [
      "mcp__kestrel__create_watch",
      "mcp__kestrel__check_watch"
    ],
    "deny": [
      "mcp__kestrel__delete_watch"
    ]
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as kestrel. Review it before you use it.