io.github.physics-star-cat/databutler
databutler
Verified facts for AI agents: rates, exams, recalls, holidays, and what changed since your cutoff.
alive probed 2026-10-13 · HTTP 200
11tools
5.8ktokens in Claude Opus 5.5
5.9ktokens in Claude Code
2.9 %of a 200k context window
3.5ko200k_base estimate
759 msto initialize
205 msto list tools
- Endpoint
- https://databutler.dev/api/mcp (streamable-http)
- Host
- databutler.dev
- Protocol
- 2025-11-25
- Reports itself as
- databutler 1.1.0
- Capabilities
- tools
- Instructions
- 2 699 characters
- Claude count
- Claude Opus 5.5, measured 2026-10-13. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/physics-star-cat/databutler
- Website
- https://databutler.dev/api
- Registry
- active, updated 2026-10-04 · registry entry
- Reachable
- 3 of the last 3 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| call | 578 | 17 % |
| what_changed_since | 542 | 16 % |
| take_home_pay | 452 | 13 % |
| get_fact | 376 | 11 % |
| coverage | 348 | 10 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-13 11:17 | alive | 281 ms | 11 | 5.8k | 3.5k |
| 2026-10-05 15:25 | alive | 759 ms | 9 | 4.9k | 2.9k |
| 2026-10-05 00:43 | alive | 287 ms | 9 | 2.9k |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.physics-star-cat/databutler)
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.