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Japanese Law Revision History: Every Amendment and Enforcement Date by Law ID (e-Gov 法令検索)

egovlaws/law-revision-history

The full revision history of one Japanese law by its law ID (as returned by the title search, for example 412AC0000000131): every revision with its revision ID, title, category, the amending law, promulgation and enforcement dates, repeal status and whether it is in force now, including promulgated amendments not yet in force. Metadata only, not the text of the law. A law ID that does not exist returns a not-found error. Data from the e-Gov 法令検索 law database of the Digital Agency of Japan, passed through unmodified and served by Eden Engine; not an official Digital Agency 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 $5.

Data source

e-Gov 法令検索 (Digital Agency, Japan)

出典：e-Gov法令検索（https://laws.e-gov.go.jp）, デジタル庁. Japan Public Data License 1.0. Served by Eden Engine; not an official Digital Agency 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.

Install itCreate an account
agent
// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "egovlaws/law-revision-history" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "egovlaws/law-revision-history" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "egovlaws/law-revision-history", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "egovlaws/law-revision-history", 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.

ChargePrice
Per call
$0.0026
Updated
Oct 20, 2026

Input and output schemas

Input schema
input_schema.json
{
  "type": "object",
  "required": [
    "law_id"
  ],
  "properties": {
    "law_id": {
      "type": "string",
      "pattern": "^[0-9A-Za-z]{10,20}$",
      "description": "The e-Gov law ID, letters and digits, for example 412AC0000000131 (the Act on Management of Copyright and Neighboring Rights). Find it with the title search."
    }
  },
  "additionalProperties": false
}
Output schema
output_schema.json
{
  "type": "object",
  "required": [
    "law_info",
    "revisions"
  ],
  "properties": {
    "law_info": {
      "type": "object",
      "description": "Identity of the law: `law_id`, `law_num` (official number, in Japanese), `law_type` and `promulgation_date`.",
      "additionalProperties": true
    },
    "revisions": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "category": {
            "type": "string"
          },
          "law_title": {
            "type": "string",
            "description": "Title of the law at this revision, in Japanese."
          },
          "repeal_status": {
            "type": "string"
          },
          "law_revision_id": {
            "type": "string"
          },
          "amendment_law_num": {},
          "amendment_law_title": {},
          "current_revision_status": {
            "type": "string",
            "description": "For example CurrentEnforced for the revision in force now, UnEnforced for a future one."
          },
          "amendment_promulgate_date": {},
          "amendment_enforcement_date": {}
        },
        "additionalProperties": true
      },
      "description": "Every revision of the law, including promulgated ones not yet in force."
    }
  },
  "description": "The law's identity and the list of its revisions.",
  "additionalProperties": true
}