Kestrel

dev.workers.perch-app.kestrelPublished by kestrel.perch-app.workers.devOfficial publisherv1.0.0Updated Oct 24, 2026

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

VerifiedStreamable HTTPWeb executableWeb Search & ScrapingSecurity & Monitoring

Overview

AI-generated overview

Kestrel is a remote MCP server that lets an assistant watch web pages or JSON/text URLs for changes, capturing a baseline and reporting diffs on later checks.

What you can do
Create watches on a page or JSON/text URL, capturing a baseline snapshot and returning a watch ID and token, with an existing token used to add more watches under the same account. Re-check a watch to re-fetch the page, report whether it changed with a short list of added or removed content lines, and update the baseline. List all watches under a token with per-watch check and change counts. Delete a watch to stop monitoring a page.
When to use it
Useful when you want an assistant to track whether a page or feed changed over time, such as monitoring a status page, price listing, or JSON endpoint, and to summarize what changed between checks.
Requirements
A remote streamable HTTP endpoint; no packages, environment variables, or headers are declared. No signup or API key is needed; a token returned by create_watch is used to check, list, and manage watches.
Before you install
The token returned by create_watch is the only way to check and manage your watches, so keep it safe. Checking a watch updates its baseline, so earlier diffs are not retained. The server fetches the URLs you give it, which may expose private or internal addresses to a third-party service.

Installation

In SourceWeft

  1. Open Kestrel in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/dev.workers.perch-app.kestrel%2Fkestrel/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "kestrel": {
      "type": "http",
      "url": "https://kestrel.perch-app.workers.dev/mcp"
    }
  }
}

Tools

4

create_watch

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.

Parametersurlrequiredlabeltoken

check_watch

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).

Parameterstokenrequiredwatch_idrequired

list_watches

List all watches under your token, with per-watch check/change counts.

Parameterstokenrequired

delete_watch

Stop monitoring a page and delete the watch.

Parameterstokenrequiredwatch_idrequired

Version history

1
  1. v1.0.0LatestSep 22, 2026

Score

72% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts

    Publish an icon in the registry entry.

  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.