Use Sumbloom MCP with Claude Desktop and claude.ai
Number puzzle API + MCP: solver-checked puzzles as JSON/SVG, daily puzzle. $5/mo; 50 free/day.
Remote MCP server (Streamable HTTP), nothing to install. Free: 50 free/day · Paid: $5/mo
Set it up
- Open Customize › Connectors (on Team and Enterprise, an owner adds it under Organization settings › Connectors).
- Click + Add, then Add custom connector.
- Name it Sumbloom and paste the server URL: https://sumbloom.cybermaxtools.com/mcp?via=use-with-claude-desktop
- Under Authentication choose No sign in.
- For a paid key, add a request header named x-api-key with your key; leave it out for the free tier.
- Click Add, then enable the connector for your chat.
Claude stores fixed request headers encrypted. On Team and Enterprise plans everyone in the workspace shares that credential.
- no file: remote servers are added as custom connectors in Claude's settings
Tools you get
Endpoint checked 2026-10-09: https://sumbloom.cybermaxtools.com/mcp answered an MCP initialize (protocol 2025-06-18) and tools/list with 1 tool, all marked read-only. No key was used and no tool was called.
| Tool | What it does | Required inputs |
|---|---|---|
get_number_puzzle | Returns an original number puzzle (Target, Cage Grid or Brick Pyramid) at easy, medium or hard, with its rules, the puzzle as JSON, an SVG image URL for printing and, optionally, the solution. Cage Grids and Pyramids have exactly one solution (solver-checked). Use it for math practice, classroom warm-ups, puzzle apps or a daily puzzle. Free tier 50 puzzles a day without a key; paid API keys (Bearer) for more. | none |
Test the endpoint from a terminal
This lists the tools without a key and without calling any of them:
curl -s https://sumbloom.cybermaxtools.com/mcp \
-H 'content-type: application/json' \
-H 'accept: application/json, text/event-stream' \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'If it does not work
- Custom connectors connect from Anthropic's cloud, not your computer; our servers are public, so no allowlisting is needed.
- Free plans can add one custom connector.
- To change the URL or header, remove the connector and add it again.
- The free tier has a daily limit (see the pricing line above); a paid key raises it.
Sumbloom in other clients
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