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com.exitvaluecalculator/site

by exitvaluecalculator.com · remote · no sign-in to list tools · v1.0.1 · published by com.exitvaluecalculator

Exit Value Calculator: the site's own MCP server — calculator, enquiry (enquiry = a human...

Changes · 3
CompareRegistry entry

5 tools: 3 change things and 2 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 site https://exitvaluecalculator.com/mcp

Tools

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

5 tools

Changes things 3Claude Code: ask
  • calculateRun the Exit proceeds calculator (2026/27) calculator: Chargeable gain; Tax at the 18% relief rate; Tax at 24% on gains above the relief; Total Capital Gains Tax.No findings

    Why it is in this group

    • The description's first verb is "run": a word for a change.
    Description, as the server wrote it
    Run the Exit proceeds calculator (2026/27) calculator: Chargeable gain; Tax at the 18% relief rate; Tax at 24% on gains above the relief; Total Capital Gains Tax. Missing inputs fall back to their documented defaults.
  • enquiry_fieldsEvery field of the Exit Value Calculator enquiry: key, label, type, whether required, help text and the allowed options where there are any.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
    Every field of the Exit Value Calculator enquiry: key, label, type, whether required, help text and the allowed options where there are any. Pass answers to submit_enquiry keyed by field key.
  • submit_enquirySubmits an enquiry to Exit Value Calculator — NOT a purchase, NOT a guaranteed quote.No findings

    Why it is in this group

    • The name "submit_enquiry" says "submit": a word for a change.
    Description, as the server wrote it
    Submits an enquiry to Exit Value Calculator — NOT a purchase, NOT a guaranteed quote. Step 1: call with the answers (keyed by field key from enquiry_fields) and consent=true; it validates and returns a summary, the consent line and a confirmation token — show the person the summary and the consent line. Step 2: only if the person agrees, call again with the same answers, consent=true and the confirmation token; the enquiry is then submitted, and the person receives an email with a link they must click before any provider sees it. Consent means the person has read and agreed to: "Send my contact details to up to three business valuation and exit advisers, chosen by Exit Value Calculator, who'll contact me directly. I'll be emailed each firm's name as my details go to it, and can stop any more firms getting them."
Only reads 2Claude Code: allow
  • calculator_describeThe inputs this calculator takes (with units, ranges and defaults), the outputs it returns, and the assumptions and tables behind it.Reads private dataNo findings

    Why it is in this group

    • The name "calculator_describe" says "describe": a word for reading.

    What it can reach

    • private-dataThe description's first sentence says "table": it reads databases.
    Description, as the server wrote it
    The inputs this calculator takes (with units, ranges and defaults), the outputs it returns, and the assumptions and tables behind it.
  • enquiry_describeRead first.No findings

    Why it is in this group

    • The name "enquiry_describe" says "describe": a word for reading.
    Description, as the server wrote it
    Read first. States plainly what submit_enquiry does on Exit Value Calculator: it starts an enquiry with human providers who quote directly. Nothing is bought, ordered or paid; no quote is guaranteed; it is free. Also returns who receives the details, the consent wording, and how the person confirms.

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 untrusted-input or outbound.

Reads private data1
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write0
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.

Remote posture

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

Looked at Oct 22, 2026, 14:31 UTC, unchanged since Oct 22, 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
3
Protocol version
2025-06-18
WWW-Authenticate on 401
not observed
resource_metadata in WWW-Authenticate
none
RFC 9728 protected resource metadata
none
Authorization servers
none
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 3 tools that change things (3 write). Whether a call also works without credentials was not tested: tools are never called.

    Matched text

    https://exitvaluecalculator.com/mcp: tools/list returned 5 tools to an anonymous client, including calculate (write), enquiry_fields (write), submit_enquiry (write)

    What this check looks for

Install

Pinned to version 1.0.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http site https://exitvaluecalculator.com/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__site__calculator_describe",
      "mcp__site__enquiry_describe"
    ],
    "ask": [
      "mcp__site__calculate",
      "mcp__site__enquiry_fields",
      "mcp__site__submit_enquiry"
    ],
    "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 site. Review it before you use it.

Capability tags behind 1 rule
  • mcp__site__calculator_describe private-data