Japan Agent API

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Japan JMA warnings, typhoons, volcano levels and municipality code history in English; x402 checks

Measured statistics

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "Japan Agent API": {
      "url": "https://japan-agent-api-production.mk-career-planning.workers.dev/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (8)

• catalog read-only

  List the tools of this server with prices, data sources, licensing, daily limits and data freshness.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• jp_warnings read-only

  Which JMA weather emergency warnings, warnings and advisories are in effect in this Japanese prefecture now? Structured JSON in English and Japanese (type, level, status, areas with JMA's English names, issued_at, source URL). Relay only; no independent forecast.

  Parameters:

  • prefecture (required) — string — Japanese prefecture: English name (e.g. "Tokyo", "Osaka", "Hokkaido"; "Tokyo-to" and "Osaka Prefecture" also work), Japanese name in kanji, or JIS code "01".."47".
  • include_municipalities — boolean — Also list every municipality (Japanese and English names) per warning. Default false.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world yes

• jp_typhoons read-only

  Which typhoons is JMA issuing bulletins for right now, and what do the bulletins forecast? Number, name, center position, central pressure, maximum wind, issue time, and forecast-circle centers, radii and times, relayed as structured JSON from JMA bulletins (VPTW60-65). No independent forecast, interpolation or track extension.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world yes

• jp_volcanoes read-only

  What is the current JMA Volcanic Alert Level (1-5, or warning kind) of this volcano or of every JMA-monitored volcano? Name in English or Japanese, or 3-digit JMA code. Returns JMA English and Japanese names, level, previous level and change, issue time, prefectures named in JMA bulletins, source URL and freshness receipt. Relay only; no forecast or interpretation. Gaps filled from JMA website lists (newer wins). No JMA source seen = not_seen_in_checked_feeds, never assumed level 1.

  Parameters:

  • volcano — string — Optional. JMA volcano name in English (e.g. "Sakurajima", "Asamayama") or Japanese (e.g. "桜島"), or the 3-digit JMA volcano code (e.g. "506"). Omit to list all volcanoes.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world yes

• jp_municipality read-only

  Which code does this Japanese municipality have on a date (default today)? Give a 5/6-digit code, or prefecture and name (old names OK). Returns status mapped / split_candidates / unknown / invalid, the valid code with English and Japanese names, change type and date (merger, incorporation, division, designated city, name change), confirmed JMA warning areas only, and J-LIS convenience-store certificate availability for 8 certificate types. Facts only, from e-Stat LOD (CC BY 4.0) and J-LIS.

  Parameters:

  • code — string — Municipality code: 5 digits, or 6 digits including the check digit (e.g. 22131 or 221317).
  • name — string — Municipality or ward name in Japanese (old names accepted; a ward may be prefixed with its city) or its e-Stat English name (e.g. "Naka-ku", "Hamamatsu-shi"). Use with prefecture.
  • as_of — string — YYYY-MM-DD. The date the answer is for (default: today in Japan time).
  • prefecture — string — Japanese prefecture: English name (e.g. "Tokyo", "Osaka", "Hokkaido"; "Tokyo-to" and "Osaka Prefecture" also work), Japanese name in kanji, or JIS code "01".."47". Use with name.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• get_receipt read-only

  Re-fetch the stored result of a settled paid call (e.g. jp_trip_impact_check) by its receipt_id, for when the response was lost after payment. Free. Unknown or unsettled receipt ids return RECEIPT_NOT_FOUND. Results are kept for 90 days after settlement.

  Parameters:

  • receipt_id (required) — string — The receipt_id returned with a paid result ("rcpt_" + 64 hex characters).

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• jp_trip_impact_check read-only

  Does a JMA warning or advisory in effect now match a stop on this Japan itinerary [{date, prefecture}]? Per stop: matched_advisory (with severity), no_match_in_checked_sources (NOT a statement of no impact) or unknown (data missing, or date not today/tomorrow JST). Returns checked sources and areas, unchecked areas, issued_at, retrieved_at, and current JMA typhoon/volcano bulletins (listed, not matched). No forecast. Retrying with the same payment is not charged; use receipt_id with get_receipt.

  Parameters:

  • itinerary (required) — array — 1 to 14 stops {date, prefecture}, in travel order. Only stops dated today or tomorrow (Japan time) can be matched; others return unknown, but typhoon and volcano bulletins currently in effect are still listed (not matched).

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world yes

• jp_municipality_batch read-only

  Which codes are valid on a date for up to 50 Japanese municipalities? e-Stat LOD change history (CC BY 4.0): status mapped / split_candidates (all successors, not apportioned) / unknown / invalid, the code valid on as_of with English and Japanese names, change type and date, confirmed JMA warning areas only, and J-LIS convenience-store certificate availability (available / not_listed / unknown). Facts only; no document preparation or legal advice. Retrying with the same payment is not charged.

  Parameters:

  • items (required) — array — 1 to 50 lookups; each gives code, or prefecture and name.
  • as_of — string — Default as_of for items that do not set their own.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world yes

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