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io.github.physics-star-cat/databutler-us-rates

by physics-star-cat · remote · no sign-in to list tools · v1.0.0 · published by GitHub user physics-star-cat

US federal 2026 tax brackets, standard deductions, payroll and retirement limits, sourced.

Read only
CompareRegistry entry

1 tool: 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 databutler-us-rates https://databutler.dev/api/mcp/us-rates

Tools

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

1 tool

Only reads 1Claude Code: allow
  • us_rates_lookupCurrent US federal (tax year 2026) rates and thresholds read from the IRS revenue procedures and notices, SSA's Federal Register notice and irs.gov pages, each figure with its sour…Reads private dataReads text others writeNo findings

    Why it is in this group

    • The name "us_rates_lookup" says "lookup": a word for reading.

    What it can reach

    • private-dataThe description's first sentence says "table": it reads databases.
    • untrusted-inputThe description's first sentence says "url": it reads web pages, which anyone can write.
    Description, as the server wrote it
    Current US federal (tax year 2026) rates and thresholds read from the IRS revenue procedures and notices, SSA's Federal Register notice and irs.gov pages, each figure with its source URL, the quoted sentence or table row, verifiedDate and the prior-year value where one exists. Categories: income-tax (rate schedules for Single, Married filing jointly, Head of household and Married filing separately as bracket rows, standard deduction by filing status, additional and dependent standard deduction, top rate), social-security (OASDI wage base, employee and employer rates, COLA, quarter of coverage), medicare (rate, Additional Medicare Tax rate and thresholds by filing status, employer withholding threshold), retirement (401(k)/403(b)/457(b)/TSP deferral limit, age-50 and age-60–63 catch-ups, Roth catch-up wage threshold, § 415(c) and compensation limits, IRA and IRA catch-up, SIMPLE, highly compensated employee), hsa (contribution limits, HDHP minimum deductible and out-of-pocket maximum, excepted-benefit HRA), estate-gift (basic exclusion, GST exemption, annual gift exclusions). Federal only: state income taxes, AMT, EITC and capital-gains brackets are not covered. An unknown category answers covered:false with the nearest keys.

    Annotations the server declares

    • title: US federal rates lookup
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false

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 outbound.

Reads private data1
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write1
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out0
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.

Install

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

claude mcp add --transport http databutler-us-rates https://databutler.dev/api/mcp/us-rates

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__databutler-us-rates__us_rates_lookup"
    ],
    "ask": [],
    "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 databutler-us-rates. Review it before you use it.

Capability tags behind 1 rule
  • mcp__databutler-us-rates__us_rates_lookup private-data, untrusted-input