io.github.ianderso/familysearch-mcp
FamilySearch
Genealogical research on FamilySearch: historical places, indexed records, page images, the tree.
alive probed 2026-10-15
28tools
12ktokens in Claude Opus 5.5
13ktokens in Claude Code
6.2 %of a 200k context window
7.6ko200k_base estimate
2.1 sto initialize
10 msto list tools
- Run it
- uvx familysearch-mcp==1.4.0 (stdio, probed in a container with the network off)
- Host
- pypi.org
- Reports itself as
- familysearch-mcp 1.4.0
- Capabilities
- prompts, resources, tools
- Instructions
- 742 characters
- Claude count
- Claude Opus 5.5, measured 2026-10-15. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/ianderso/familysearch-mcp
- Registry
- active, updated 2026-10-11 · registry entry
- Reachable
- 1 of the last 1 probe
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| compare_person | 1 152 | 15 % |
| search_records | 750 | 10 % |
| fulltext_search | 461 | 6 % |
| get_catalog_entry | 402 | 5 % |
| get_matches | 317 | 4 % |
Badge and feed
[](https://mcpcost.ulehla.dev/s/io.github.ianderso/familysearch-mcp)
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.