Use Sumbloom MCP with Cursor

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 or create the mcp.json file (global or per project).
Add the server under "mcpServers" as shown and save.
Open Cursor's settings, find the MCP section and check that the server is enabled and lists its tools.
Ask the agent a question the tools can answer and approve the tool call.

Add to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "sumbloom": {
      "url": "https://sumbloom.cybermaxtools.com/mcp?via=use-with-cursor"
    }
  }
}

With a paid key:

{
  "mcpServers": {
    "sumbloom": {
      "url": "https://sumbloom.cybermaxtools.com/mcp?via=use-with-cursor",
      "headers": {
        "x-api-key": "${env:CYBERMAX_API_KEY}"
      }
    }
  }
}

Cursor fills ${env:CYBERMAX_API_KEY} from your environment, so the key never sits in the file.

Where it goes:

~/.cursor/mcp.json (every project)
.cursor/mcp.json (this project only)

Config format checked 2026-10-09 against Cursor's MCP documentation.

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

Cursor uses the top-level key "mcpServers" (VS Code uses "servers"); a file copied from VS Code will not load.
After editing the file, toggle the server off and on in settings if the tools do not appear.
The free tier has a daily limit (see the pricing line above); a paid key raises it.

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