Open Library subject API

Works shelved under one Open Library subject, with authors, years and covers.

Ask your agent

“Call openlibrary/subject with handle science_fiction and summarize what comes back.”

Works in any MCP client connected to https://data.openkrill.app/mcp. Install in one line.

Path: openlibrary/subject
MCP tool: call_endpoint
Credits: 5
Cache: 2 min

Parameters

handlestring, required	Subject slug, such as science_fiction
limitinteger, optional	1-100 works, default 20
offsetinteger, optional	Page offset, default 0

Response

data.resources[] uses the same keys as every other platform: author, engagement, metadata, with Open Library-only fields under extras. A failed upstream call is never billed.

More Open Library tools

MCP tool call

{
  "name": "call_endpoint",
  "arguments": {
    "path": "openlibrary/subject",
    "params": {
      "handle": "science_fiction"
    }
  }
}

curl

curl "https://data.openkrill.app/v1/openlibrary/subject?handle=science_fiction" \
  -H "x-api-key: YOUR_API_KEY"

Response

{
  "success": true,
  "platform": "openlibrary",
  "endpoint": "openlibrary/subject",
  "data": {
    "resources": [
      { "id": …, "title": …, "text": …, "url": …,
        "author": {…}, "engagement": {…},
        "metadata": {…}, "extras": {…} }
    ]
  },
  "credits_used": 5,
  "cached": false
}