MCP server

Kestrel

dev.workers.perch-app.kestrel/kestrel

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Working at last checkAbout 453 tokens per request once connected4 tools

https://kestrel.perch-app.workers.dev/mcp

At a glance

Type: MCP server
Publisher: Not verified
Status: Working at last check
Tools: 4
Token cost: About 453 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.kestrel]
url = "https://kestrel.perch-app.workers.dev/mcp"

Gemini CLI

{"mcpServers":{"kestrel":{"httpUrl":"https://kestrel.perch-app.workers.dev/mcp"}}}

Cursor

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

VS Code

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

Antigravity

agy mcp add kestrel https://kestrel.perch-app.workers.dev/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"kestrel","server_url":"https://kestrel.perch-app.workers.dev/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"kestrel","server_url":"https://kestrel.perch-app.workers.dev/mcp"}

check_watch ~134 tokens
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_watch ~197 tokens
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.
delete_watch Deletes data · ~63 tokens
Stop monitoring a page and delete the watch.
list_watches ~59 tokens
List all watches under your token, with per-watch check/change counts.

FetchDelta
Web Markdown, diffs, pricing and daily watches. Paid x402 Base USDC tools; free previews.
how.is domain & IP intelligence
Pay-per-call DNS, WHOIS, domain age, TLS, email auth, blocklists, IP intel. Free samples.
Rendex: Rendering API for Images, PDFs & Content Extraction
Render HTML, Markdown, or URLs to images, PDF, or branded artifacts; extract and watch pages.
Fresh402 Web Intelligence API
Web intelligence: free baseline, Check, Extract, Smart Diff and OpenAPI Diff. x402 USDC on Base.
ToolFit + MCPCheck
Audit, pin and diff agent tool lists; preflight and watch remote MCP servers. Free tier; x402.
Contrie
Extract structured data from a web page, read it as markdown, verify values against the source.
YouSpot
Query one person's second brain: contacts, companies, notes, files and connected accounts.
ZadenWorks
Read, screenshot, diff, verify and audit any URL: SEO, links, sitemaps, schema, a11y.

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