# Double Down Trivia anagrams

Play and solve trivia anagrams at https://doubledowntrivia.web.app/anagram/

This is a letter-signature index, not an LLM. Normalize to a-z, sort the letters, look up the bag. Same signature means the same letters in any order.

## For people

- Play: https://doubledowntrivia.web.app/anagram/ (default). Famous titles only. No sign-in.
- Daily: https://doubledowntrivia.web.app/anagram/daily/ One scramble a day. Same for everyone. This browser.
- Stats: https://doubledowntrivia.web.app/anagram/stats/ (this browser)
- Unscramble / Make: same page, other tabs. Full index is ~130k titles.

## For agents (MCP)

Stateless Streamable HTTP, protocol 2026-07-28, no auth. POST only.

`https://doubledowntrivia.web.app/mcp`

Required headers: `MCP-Protocol-Version: 2026-07-28`, `Mcp-Method` matching the JSON-RPC method, and `Mcp-Name` matching `params.name` on `tools/call`. Header mismatch returns HTTP 400 and JSON-RPC `-32020`. Unknown methods return HTTP 404 and `-32601`.

Tools: `anagram_solve`, `anagram_search`, `anagram_scramble`, `anagram_play`.

POST JSON-RPC 2.0. Example:

```
POST /mcp
MCP-Protocol-Version: 2026-07-28
Mcp-Method: tools/call
Mcp-Name: anagram_solve
Content-Type: application/json

{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"anagram_solve","arguments":{"scramble":"A NOON TACO PAVILION ANT SLAM"}}}
```

## Public JSON

- https://doubledowntrivia.web.app/anagram/play.json (famous subset with a fame score)
- https://doubledowntrivia.web.app/anagram/manifest.json
- https://doubledowntrivia.web.app/anagram/movies.json (and tv, people, books, places)

Play places require population >= 100000 or they are countries. TV uses TVmaze weight. People need multiple film credits.