Is the UK Data: Finance formulas MCP server safe?

No scan can promise that. What its definitions show: 10 tools, 10 of which can change, send or delete something, and 0 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: Finance formulas 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: Finance formulas 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: Finance formulas MCP server have?

10 tools: 10 write. calculate_discounted_price, calculate_investment_return, future_investment_value, calculate_interest, calculate_discount, calculate_tax, project_investment_growth, compound_interest and 2 more.

Does the UK Data: Finance formulas MCP server need sign-in or OAuth?

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

Does the UK Data: Finance formulas 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: Finance formulas MCP server changed its tools?

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

UK Data: Finance formulas MCP server

uk.co.reliness/finance-formulasreliness.co.ukstreamable-httpv1.5.0Scanned 8 days ago

Compound and simple interest, investment growth, future value, CAGR, dividends and tax at a rate

10 tools: 10 change things.

Reads private data · 0
Reads text others write · 10
Can send data out · 0
No findings

Tools listed without sign-in. Remote posture

With Anlyon

10 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: Finance formulas MCP server can do

The UK Data: Finance formulas MCP server is published by reliness.co.uk, a domain the MCP Registry verified. It has 10 tools. It can create or change data (10 tools: calculate_discounted_price, calculate_investment_return, future_investment_value, calculate_interest and 6 more), but cannot delete data. None of its tools only reads.

10 tools bring in text other people can write (calculate_discounted_price, calculate_investment_return, future_investment_value and 7 more).

None of the fixed checks matched anything in its tool definitions. That is not a safety guarantee.

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.

10 tools

Changes things 10Creates or changes something that can be changed back.Claude Code: ask

cagrCalculates the Compound Annual Growth Rate (CAGR) using the formula CAGR = (end_value/start_value)^(1/years) - 1.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 Compound Annual Growth Rate (CAGR) using the formula CAGR = (end_value/start_value)^(1/years) - 1. Returns the annualized rate of return as a percentage. (cost: 1 credit)
Annotations the server declares
- title: cagr
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
calculate_discountCalculates the discounted price after applying a percentage discount to the original price.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 discounted price after applying a percentage discount to the original price. Returns both discount amount and final price. (cost: 1 credit)
Annotations the server declares
- title: calculate discount
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
calculate_discounted_priceCalculates the final price after applying a discount percentage to the original price, rounded to 2 decimal places.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 final price after applying a discount percentage to the original price, rounded to 2 decimal places. (cost: 1 credit)
Annotations the server declares
- title: calculate discounted price
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
calculate_dividend_per_shareCalculates the dividend per share by dividing total dividend payout by number of outstanding shares.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 dividend per share by dividing total dividend payout by number of outstanding shares. Returns the quarterly dividend amount per share rounded to 2 decimal places. (cost: 1 credit)
Annotations the server declares
- title: calculate dividend per share
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
calculate_interestCalculates simple interest using the formula: Interest = Principal × Rate × Time.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 simple interest using the formula: Interest = Principal × Rate × Time. Rate should be provided as a percentage and time in years. (cost: 1 credit)
Annotations the server declares
- title: calculate interest
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
calculate_investment_returnCalculates the return on investment using compound interest formula.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 return on investment using compound interest formula. Returns the final amount and total return given an initial deposit, annual interest rate (as a percentage), and investment period in years. (cost: 1 credit)
Annotations the server declares
- title: calculate investment return
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
calculate_taxCalculates the tax amount by applying a tax rate percentage to an income or price amount.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 tax amount by applying a tax rate percentage to an income or price amount. Formula: amount × (rate / 100). (cost: 1 credit)
Annotations the server declares
- title: calculate tax
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
compound_interestCalculates compound interest using the formula A = P(1 + r/n)^(nt), where A is final amount, P is principal, r is annual rate, n is compounding frequency per year, and t is time in…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 compound interest using the formula A = P(1 + r/n)^(nt), where A is final amount, P is principal, r is annual rate, n is compounding frequency per year, and t is time in years. (cost: 1 credit)
Annotations the server declares
- title: compound interest
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
future_investment_valueCalculates the future value of an investment using compound interest formula: FV = PV × (1 + r)^n, where r is annual interest rate and n is years.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 future value of an investment using compound interest formula: FV = PV × (1 + r)^n, where r is annual interest rate and n is years. (cost: 1 credit)
Annotations the server declares
- title: future investment value
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
project_investment_growthProjects investment growth over years using compound interest with optional annual additions and inflation adjustment.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
Projects investment growth over years using compound interest with optional annual additions and inflation adjustment. Formula: FV = PV(1+r)^n + PMT×[((1+r)^n - 1)/r], with each annual addition made at the end of the year. (cost: 1 credit)
Annotations the server declares
- title: project investment growth
- 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 write10: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; cagr
calculate_discount
calculate_discounted_price
calculate_dividend_per_share
calculate_interest
calculate_investment_return
calculate_tax
compound_interest
future_investment_value
project_investment_growth
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, 06:21 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: 10
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 10 tools that change things (10 write). Whether a call also works without credentials was not tested: tools are never called.
Matched text
https://ukdata.reliness.co.uk/mcp/finance-formulas: tools/list returned 10 tools to an anonymous client, including calculate_discounted_price (write), calculate_investment_return (write), future_investment_value (write), calculate_interest (write), calculate_discount (write) and 5 more
What this check looks for

Findings

Matches of fixed checks, with the text they matched.

No check matched anything in these tool definitions. That is not a safety guarantee.

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 finance-formulas https://ukdata.reliness.co.uk/mcp/finance-formulas

claude mcp add --transport http finance-formulas https://ukdata.reliness.co.uk/mcp/finance-formulas

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__finance-formulas__calculate_discounted_price",
      "mcp__finance-formulas__calculate_investment_return",
      "mcp__finance-formulas__future_investment_value",
      "mcp__finance-formulas__calculate_interest",
      "mcp__finance-formulas__calculate_discount",
      "mcp__finance-formulas__calculate_tax",
      "mcp__finance-formulas__project_investment_growth",
      "mcp__finance-formulas__compound_interest",
      "mcp__finance-formulas__cagr",
      "mcp__finance-formulas__calculate_dividend_per_share"
    ],
    "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 finance-formulas. Review it before you use it.

Capability tags behind 10 rules

mcp__finance-formulas__calculate_discounted_price untrusted-input
mcp__finance-formulas__calculate_investment_return untrusted-input
mcp__finance-formulas__future_investment_value untrusted-input
mcp__finance-formulas__calculate_interest untrusted-input
mcp__finance-formulas__calculate_discount untrusted-input
mcp__finance-formulas__calculate_tax untrusted-input
mcp__finance-formulas__project_investment_growth untrusted-input
mcp__finance-formulas__compound_interest untrusted-input
mcp__finance-formulas__cagr untrusted-input
mcp__finance-formulas__calculate_dividend_per_share 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/finance-formulas/verify?hash=2a26e99f07632261590e22495597b968330884cf3c6eb07a4fcc176acd252ee9" | jq -e '.changed == false'

Pinned hash 2a26e99f0763, 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/finance-formulas/changes.xml

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

Badge

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

Source: MCP Registry. Synced Nov 7, 2026, 12:18 UTC.