dev.workers.perch-app.kestrel/kestrel
kestrel
Watch any URL for changes: baseline, then check for a diff. Free, no signup/key.
alive probed 2026-10-05 · HTTP 200
4tools
603tokens in Claude Opus 5.5
639tokens in Claude Code
0.3 %of a 200k context window
350o200k_base estimate
179 msto initialize
99 msto list tools
- Endpoint
- https://kestrel.perch-app.workers.dev/mcp (streamable-http)
- Host
- kestrel.perch-app.workers.dev
- Protocol
- 2024-11-05
- Reports itself as
- kestrel 1.0.0
- Capabilities
- tools
- Instructions
- none
- Claude count
- Claude Opus 5.5, measured 2026-10-05. Counted again when the tool definitions change. Method.
- Website
- https://kestrel.perch-app.workers.dev
- Registry
- active, updated 2026-09-22 · registry entry
- Reachable
- 6 of the last 6 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| create_watch | 154 | 44 % |
| check_watch | 103 | 29 % |
| delete_watch | 49 | 14 % |
| list_watches | 44 | 13 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-05 14:02 | alive | 179 ms | 4 | 603 | 350 |
| 2026-10-05 00:25 | alive | 97 ms | 4 | 350 | |
| 2026-10-04 10:00 | alive | 109 ms | 4 | 350 | |
| 2026-10-04 07:54 | alive | 88 ms | 4 | 350 | |
| 2026-10-03 20:33 | alive | 164 ms | 4 | 350 | |
| 2026-10-03 17:50 | alive | 137 ms | 4 | 350 |
Badge and feed
[](https://mcpcost.ulehla.dev/s/dev.workers.perch-app.kestrel/kestrel)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.