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CPI Inflation Calculator

io.github.theluckystrike/cpi-inflation-calculator-mcptheluckystrikestreamable-httpv1.0.0Scanned

Inflation calculator with official BLS CPI 1913 to the latest month, raise vs inflation, SS COLA.

5 tools: 1 do something that can't be undone, 1 change things and 3 only read.

Tools: 0 delete, 1 irreversible, 1 write, 3 read.
  • Reads private data · 0
  • Reads text others write · 5
  • Can send data out · 1
  • 1 finding

Anlyon alternative

2 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

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Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

5 tools

Can't be undone 1Claude Code: ask
  • calculate_inflationAdjusts a dollar amount for inflation between any two periods from 1913 to the latest month the U.S.Reads text others writeCan send data out1 finding

    Why it is in this group

    • The input addresses people (input.to): what it sends cannot be taken back.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    • outboundThe input takes a destination (input.to): what the tool writes goes there.

    Findings

    • Warn

      The server marks "calculate_inflation" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".

      Matched text

      annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The input addresses people (input.to): what it sends cannot be taken back.

      What this check looks for
    Description, as the server wrote it
    Adjusts a dollar amount for inflation between any two periods from 1913 to the latest month the U.S. Bureau of Labor Statistics has published, using the official CPI-U (or CPI-W or core CPI). Checks the BLS Public Data API live for months newer than its bundled data (bundled through September 2026, fetched 2026-11-03), so it knows CPI figures newer than a model's training data. Handles the October 2025 gap: BLS published no October 2025 CPI because of the 2025 lapse in appropriations. Returns the adjusted amount, cumulative and average annual inflation, and the exact index values used.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
    • title: Inflation calculator (CPI)
Changes things 1Claude Code: ask
  • calculate_social_security_colaComputes the Social Security cost-of-living adjustment for a year with the statutory formula: average CPI-W for July-September of the prior year over the same quarter a year earlie…Reads text others writeNo findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Computes the Social Security cost-of-living adjustment for a year with the statutory formula: average CPI-W for July-September of the prior year over the same quarter a year earlier, rounded to 0.1%. Uses official BLS CPI-W values (live check). Reproduces the 3.6% COLA for 2027 that SSA announced in October 2026, and shows the Q3 index values behind it. Covers 1976 onward.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
    • title: Social Security COLA from CPI-W
Only reads 3Show 3 read-only tools
  • compare_raise_to_inflationCompares a pay change with CPI inflation over the same period using official BLS data through the latest published month (checked live).Reads text others writeNo findings

    Why it is in this group

    • The name "compare_raise_to_inflation" says "compare": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Compares a pay change with CPI inflation over the same period using official BLS data through the latest published month (checked live). Returns the nominal raise, inflation, the real (inflation-adjusted) raise, the pay needed to keep pace, and the gain or shortfall. Works for salaries, hourly wages, rents or any recurring amount.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
    • title: Raise vs inflation
  • get_inflation_rateReturns the official U.S.Reads text others writeNo findings

    Why it is in this group

    • The name "get_inflation_rate" says "get": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Returns the official U.S. inflation rate for a calendar year from BLS CPI data: annual-average change (BLS annual averages, including the 2025 average published despite the missing October 2025 index), December-to-December change, and for the current year the latest 12-month rate. Years 1914 to the present for CPI-U and CPI-W, 1958 onward for core CPI.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
    • title: Inflation rate by year
  • get_latest_cpiReturns the most recent CPI index values published by the Bureau of Labor Statistics, checked live against the BLS Public Data API: the latest month, the 12-month inflation rate fo…Reads text others writeNo findings

    Why it is in this group

    • The name "get_latest_cpi" says "get": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Returns the most recent CPI index values published by the Bureau of Labor Statistics, checked live against the BLS Public Data API: the latest month, the 12-month inflation rate for headline CPI-U, CPI-W and core CPI (less food and energy), the not seasonally adjusted 1-month change, and the year-to-date change. Use it to answer 'what is inflation right now'. If the live check fails it says so and falls back to bundled BLS data (through September 2026).

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
    • title: Latest CPI (live)

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.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data.

Reads private data0
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write5
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out1
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Findings

Matches of fixed checks, with the text they matched.

1 warn
  • Warncalculate_inflation

    The server marks "calculate_inflation" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".

    Matched text

    annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The input addresses people (input.to): what it sends cannot be taken back.

    What this check looks for

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

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

claude mcp add --transport http cpi-inflation-calculator https://cpi-inflation-calculator-mcp.lipmichal.workers.dev/mcp
claude mcp add --transport http cpi-inflation-calculator https://cpi-inflation-calculator-mcp.lipmichal.workers.dev/mcp

Run in a terminal.

Claude Code permissions

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

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__cpi-inflation-calculator__get_latest_cpi",
      "mcp__cpi-inflation-calculator__get_inflation_rate",
      "mcp__cpi-inflation-calculator__compare_raise_to_inflation"
    ],
    "ask": [
      "mcp__cpi-inflation-calculator__calculate_inflation",
      "mcp__cpi-inflation-calculator__calculate_social_security_cola"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as cpi-inflation-calculator. Review it before you use it.

Capability tags behind 5 rules
  • mcp__cpi-inflation-calculator__calculate_inflation untrusted-input, outbound
  • mcp__cpi-inflation-calculator__get_latest_cpi untrusted-input
  • mcp__cpi-inflation-calculator__get_inflation_rate untrusted-input
  • mcp__cpi-inflation-calculator__compare_raise_to_inflation untrusted-input
  • mcp__cpi-inflation-calculator__calculate_social_security_cola untrusted-input

Pin

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/io.github.theluckystrike/cpi-inflation-calculator-mcp/verify?hash=1181f9c6c3cc3ddd8a13f3de3482c9917154503abf8e6c418ac539a01dec7b56" | jq -e '.changed == false'

Pinned hash 1181f9c6c3cc, from Nov 3, 2026, 08:18 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.github.theluckystrike/cpi-inflation-calculator-mcp/changes.xml

An Atom feed. Works in any feed reader or Slack's RSS app.

Badge

anlyon.dev badge for io.github.theluckystrike/cpi-inflation-calculator-mcp
[![anlyon.dev](https://anlyon.dev/badge/io.github.theluckystrike/cpi-inflation-calculator-mcp.svg)](https://anlyon.dev/servers/io.github.theluckystrike/cpi-inflation-calculator-mcp)

Source: MCP Registry · repository. Synced Nov 3, 2026, 08:18 UTC.