Is the UK Data: Everyday calculators MCP server safe?

No scan can promise that. What its definitions show: 9 tools, 9 of which can change, send or delete something, and 2 findings from fixed checks. Allow the reads, ask before each change, and deny the deletes; the permissions block on this page does that.

Can the UK Data: Everyday calculators MCP server delete data?

No tool is classed as destructive: going by their definitions, none of them deletes, cancels or revokes anything.

Can the UK Data: Everyday calculators MCP server do things that cannot be undone?

No tool is classed as irreversible: none of them sends, pays, publishes or merges, going by their definitions.

What tools does the UK Data: Everyday calculators MCP server have?

9 tools: 9 write. calculate_grade, is_leap_year, calculate_gpa, batting_average, calculate_age, calculate_bmi, calculate_tip, calculate_calorie_intake and 1 more.

Does the UK Data: Everyday calculators MCP server need sign-in or OAuth?

Its remote endpoint listed its tools to an anonymous client, without sign-in.

Does the UK Data: Everyday calculators MCP server send data to outside services?

None of its tools sends, posts or publishes, or takes a recipient, channel or URL.

Has the UK Data: Everyday calculators MCP server changed its tools?

Not since anlyon.dev started tracking it. Last scanned Nov 7, 2026.

UK Data: Everyday calculators MCP server

uk.co.reliness/everyday-calculatorsreliness.co.ukstreamable-httpv1.5.0Scanned 8 days ago

Tips, discounts, age, BMI, calorie needs, grades, GPA and date formatting, with the formula stated

9 tools: 9 change things.

Reads private data · 0
Reads text others write · 9
Can send data out · 0
2 findings

Tools listed without sign-in. Remote posture

With Anlyon

9 tools here change things. Govern them.

Anlyon lists the tools and adopts none.
Each tool you adopt gets approvals and receipts.
Your agent never holds the key.

Govern this server →

A tool your agent calls directly is not routed through Anlyon and is not governed by it. anlyon.dev only lists and labels, and these labels are the same either way.

What the UK Data: Everyday calculators MCP server can do

The UK Data: Everyday calculators MCP server is published by reliness.co.uk, a domain the MCP Registry verified. It has 9 tools. It can create or change data (9 tools: calculate_grade, is_leap_year, calculate_gpa, batting_average and 5 more), but cannot delete data. None of its tools only reads.

9 tools bring in text other people can write (calculate_grade, is_leap_year, calculate_gpa and 6 more).

The fixed checks matched 2 findings (annotation-conflict). Each one comes with the text it matched.

Its remote endpoint lists its tools without sign-in.

Last scanned Nov 7, 2026, version 1.5.0.

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.

9 tools

Changes things 9Creates or changes something that can be changed back.Claude Code: ask

batting_averageCalculates a baseball player's batting average by dividing hits by at-bats.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
Calculates a baseball player's batting average by dividing hits by at-bats. Returns the result rounded to the specified precision (default 3 decimal places). (cost: 1 credit)
Annotations the server declares
- title: batting average
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
calculate_ageCalculates a person's age in years based on their birth date and the current date.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
Calculates a person's age in years based on their birth date and the current date. (cost: 1 credit)
Annotations the server declares
- title: calculate age
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
calculate_bmiCalculates Body Mass Index (BMI) using weight and height in either metric (kg, cm) or imperial (lbs, inches) systems.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
Calculates Body Mass Index (BMI) using weight and height in either metric (kg, cm) or imperial (lbs, inches) systems. Formula: weight / (height²). (cost: 1 credit)
Annotations the server declares
- title: calculate bmi
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
calculate_calorie_intakeCalculates recommended daily calorie intake using the Mifflin-St Jeor equation and macronutrient distribution based on personal characteristics and fitness goals.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
Calculates recommended daily calorie intake using the Mifflin-St Jeor equation and macronutrient distribution based on personal characteristics and fitness goals. Returns total daily energy expenditure (TDEE) and grams of protein, carbohydrates, and fats. (cost: 1 credit)
Annotations the server declares
- title: calculate calorie intake
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
calculate_gpaCalculates the Grade Point Average (GPA) from a list of grade points on a 4.0 scale.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
Calculates the Grade Point Average (GPA) from a list of grade points on a 4.0 scale. Returns the mean of all grades rounded to 2 decimal places. (cost: 1 credit)
Annotations the server declares
- title: calculate gpa
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
calculate_gradeConverts a numerical percentage score to a letter grade using standard grading scale (A, B, C, D, F).Reads text others write1 finding
Why it is in this group
- The description's first verb is "convert": a word for a change.
- 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.
Findings
- Warn
  The server marks "calculate_grade" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "convert": a word for a change.
  What this check looks for
Description, as the server wrote it
Converts a numerical percentage score to a letter grade using standard grading scale (A, B, C, D, F). (cost: 1 credit)
Annotations the server declares
- title: calculate grade
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
calculate_tipCalculates the tip amount based on the bill total and tip percentage.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
Calculates the tip amount based on the bill total and tip percentage. Returns the tip amount and total including tip. (cost: 1 credit)
Annotations the server declares
- title: calculate tip
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
format_dateConvert a date (and optional time) from one format to another using strftime codes (%Y %m %d %B %b %A %a %H %I %M %S %p %j).Reads text others write1 finding
Why it is in this group
- The description's first verb is "convert": a word for a change.
- 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.
Findings
- Warn
  The server marks "format_date" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "convert": a word for a change.
  What this check looks for
Description, as the server wrote it
Convert a date (and optional time) from one format to another using strftime codes (%Y %m %d %B %b %A %a %H %I %M %S %p %j). Rejects impossible dates such as 31 February instead of rolling them over. (cost: 1 credit)
Annotations the server declares
- title: format date
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
is_leap_yearChecks if a given year is a leap year using the Gregorian calendar rule (divisible by 4, except centuries unless divisible by 400).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
Checks if a given year is a leap year using the Gregorian calendar rule (divisible by 4, except centuries unless divisible by 400). (cost: 1 credit)
Annotations the server declares
- title: is leap year
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true

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 or outbound.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write9: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; batting_average
calculate_age
calculate_bmi
calculate_calorie_intake
calculate_gpa
calculate_grade
calculate_tip
format_date
is_leap_year
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.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Tools listed without sign-in

Looked at Nov 8, 2026, 06:19 UTC, unchanged since Nov 8, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable: yes
HTTP status of an anonymous initialize: 200
tools/list served without credentials: yes
Tools that change things, listed without credentials: 9
Protocol version: 2025-06-18
WWW-Authenticate on 401: not observed
resource_metadata in WWW-Authenticate: not observed
RFC 9728 protected resource metadata: not observed
Authorization servers: not observed
Legacy HTTP+SSE transport: no
Dynamic client registration: not observed
Client ID metadata documents: not observed

WarnThe whole server
The endpoint served tools/list without credentials, and the list has 9 tools that change things (9 write). Whether a call also works without credentials was not tested: tools are never called.
Matched text
https://ukdata.reliness.co.uk/mcp/everyday-calculators: tools/list returned 9 tools to an anonymous client, including calculate_grade (write), is_leap_year (write), calculate_gpa (write), batting_average (write), calculate_age (write) and 4 more
What this check looks for

Findings

Matches of fixed checks, with the text they matched.

2 warn

Warncalculate_grade
The server marks "calculate_grade" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "convert": a word for a change.
What this check looks for
Warnformat_date
The server marks "format_date" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "convert": a word for a change.
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 1.5.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http everyday-calculators https://ukdata.reliness.co.uk/mcp/everyday-calculators

claude mcp add --transport http everyday-calculators https://ukdata.reliness.co.uk/mcp/everyday-calculators

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": [],
    "ask": [
      "mcp__everyday-calculators__calculate_grade",
      "mcp__everyday-calculators__is_leap_year",
      "mcp__everyday-calculators__calculate_gpa",
      "mcp__everyday-calculators__batting_average",
      "mcp__everyday-calculators__calculate_age",
      "mcp__everyday-calculators__calculate_bmi",
      "mcp__everyday-calculators__calculate_tip",
      "mcp__everyday-calculators__calculate_calorie_intake",
      "mcp__everyday-calculators__format_date"
    ],
    "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 everyday-calculators. Review it before you use it.

Capability tags behind 9 rules

mcp__everyday-calculators__calculate_grade untrusted-input
mcp__everyday-calculators__is_leap_year untrusted-input
mcp__everyday-calculators__calculate_gpa untrusted-input
mcp__everyday-calculators__batting_average untrusted-input
mcp__everyday-calculators__calculate_age untrusted-input
mcp__everyday-calculators__calculate_bmi untrusted-input
mcp__everyday-calculators__calculate_tip untrusted-input
mcp__everyday-calculators__calculate_calorie_intake untrusted-input
mcp__everyday-calculators__format_date untrusted-input

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/uk.co.reliness/everyday-calculators/verify?hash=1650a80c2d0bd4060f3ed8061507bf1e81472ffa214556d01a517d9e60878f75" | jq -e '.changed == false'

Pinned hash 1650a80c2d0b, from Nov 7, 2026, 12:18 UTC.

Watch

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

https://anlyon.dev/servers/uk.co.reliness/everyday-calculators/changes.xml

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Badge

[![anlyon.dev](https://anlyon.dev/badge/uk.co.reliness/everyday-calculators.svg)](https://anlyon.dev/servers/uk.co.reliness/everyday-calculators)

Source: MCP Registry. Synced Nov 7, 2026, 12:17 UTC.