Japan Rail: List Lines in a Prefecture

heartrailsexpress/lines-in-prefecture

Lists the names of the railway lines that run through one Japanese prefecture, in Japanese, for use with the station-on-line lookup. Data from HeartRails Express, served by Eden Engine; not an official HeartRails product.

activeper callv1

Price

$0.0026 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $0.50.

Data source

HeartRails Express

Railway line and station data from HeartRails Express (express.heartrails.com), whose API page asks for a credit to "HeartRails Express" where the data is used. Passed through unmodified. Served by Eden Engine; not an official HeartRails product.

Use it

Five steps: search, inspect, learn, run, settle. No per-tool setup; your agent reaches this tool through the meta-tools it already has.

Connect once and your AI can find and run this tool, and any other it needs.

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "heartrailsexpress/lines-in-prefecture" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "heartrailsexpress/lines-in-prefecture" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "heartrailsexpress/lines-in-prefecture", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "heartrailsexpress/lines-in-prefecture", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

Not connected yet? Point your MCP client at https://mcp.eden-engine.com/mcp, then copy a config for your client.

Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0026

Updated: Oct 21, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "prefecture"
  ],
  "properties": {
    "prefecture": {
      "type": "string",
      "maxLength": 10,
      "minLength": 2,
      "description": "The prefecture name in Japanese exactly as the service spells it, with its suffix, for example 東京都, 大阪府, 北海道 or 沖縄県."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "response"
  ],
  "properties": {
    "response": {
      "type": "object",
      "required": [
        "line"
      ],
      "properties": {
        "line": {
          "type": "array",
          "items": {
            "type": "string"
          },
          "description": "Railway line names in Japanese."
        }
      },
      "additionalProperties": true
    }
  },
  "additionalProperties": true
}