Skip to content

HK Transit Cost — MTR fares and the government fare subsidy

by hk-transit.rowb.app · remote · no sign-in to list tools · v1.0.0 · published by app.rowb.hk-transit

Hong Kong MTR fares and the government fare subsidy, computed and recorded.

Final · 1Changes · 2
CompareRegistry entry

4 tools: 1 do something that can't be undone, 2 change things and 1 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http fares https://hk-transit.rowb.app/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

4 tools

Can't be undone 1Claude Code: ask
  • mtr_fareLook up the published MTR fare between two stations in Hong Kong, by station name or MTR station id.No findings

    Why it is in this group

    • The input addresses people (input.to): what it sends cannot be taken back.
    Description, as the server wrote it
    Look up the published MTR fare between two stations in Hong Kong, by station name or MTR station id. Returns the Octopus adult/student/JoyYou-sixty/child/elderly/PWD fares and the single-journey adult fare in HKD, with the open-data source URL. Deterministic: same input, same answer. Read-only. No key required.
Changes things 2Claude Code: ask
  • monthly_summaryTotals for one month from the trips you recorded: trip count, total fare, breakdown by mode and by payment account, and the subsidy estimate computed separately for the Octopus and…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Totals for one month from the trips you recorded: trip count, total fare, breakdown by mode and by payment account, and the subsidy estimate computed separately for the Octopus and AlipayHK accounts. Requires a bearer API key.
  • subsidy_amountCompute the Hong Kong Public Transport Fare Subsidy Scheme amount for one month, from the expenses recorded under an Octopus account and an AlipayHK account.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Compute the Hong Kong Public Transport Fare Subsidy Scheme amount for one month, from the expenses recorded under an Octopus account and an AlipayHK account. Rule taken verbatim from the Government page: one-third of the monthly public transport expenses in excess of a $500 threshold, capped at $400 per month per account; the two accounts are never combined. Returns both the truncated whole-dollar figure and the exact one-third figure. Deterministic arithmetic only. Read-only. No key required.
Only reads 1Claude Code: allow
  • log_tripRecord one public transport trip (date, from, to, fare, mode, which account paid) so it counts towards a monthly total and the subsidy estimate.No findings

    Why it is in this group

    • The name "log_trip" says "log": a word for reading.
    Description, as the server wrote it
    Record one public transport trip (date, from, to, fare, mode, which account paid) so it counts towards a monthly total and the subsidy estimate. Writes to your own ledger; a bearer API key is required and the call counts against the same monthly allowance as the REST endpoint.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http fares https://hk-transit.rowb.app/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__fares__log_trip"
    ],
    "ask": [
      "mcp__fares__mtr_fare",
      "mcp__fares__subsidy_amount",
      "mcp__fares__monthly_summary"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as fares. Review it before you use it.