RealYield

by realyield.co.uk · remote · no sign-in to list tools · v1.0.0 · published by uk.co.realyield

UK buy-to-let maths: true net yield, cashflow, Section 24, stamp duty and area rental yields.

Changes · 6

Compare Registry entry

11 tools: 6 change things and 5 only read.

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone0Claude Code: ask
Changes things6Claude Code: ask: see these tools
Only reads5Claude Code: allow: see these tools

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http realyield https://www.realyield.co.uk/mcp

Tools

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

11 tools

Changes things 6Creates or changes something that can be changed back.Claude Code: ask

calculate_btl_mortgageCalculates a UK buy-to-let mortgage: loan amount, loan-to-value, monthly and annual payment (interest-only or repayment), total interest, the interest coverage ratio lenders test a…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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Calculates a UK buy-to-let mortgage: loan amount, loan-to-value, monthly and annual payment (interest-only or repayment), total interest, the interest coverage ratio lenders test against rent, and stress-test results at higher rates.
Annotations the server declares
- title: Calculate a buy-to-let mortgage
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
calculate_capital_gains_taxEstimates UK capital gains tax on selling a rental property, shares or another asset: gain after allowable costs, private residence relief where it applied, the annual exempt amoun…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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Estimates UK capital gains tax on selling a rental property, shares or another asset: gain after allowable costs, private residence relief where it applied, the annual exempt amount, tax at basic and higher rates based on the seller's income, and how much a joint sale with a spouse or civil partner would save.
Annotations the server declares
- title: Calculate capital gains tax
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
calculate_section_24_taxWorks out a UK landlord's income tax on rental profit under Section 24, where mortgage interest is not deductible and is replaced by a 20% tax credit.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Works out a UK landlord's income tax on rental profit under Section 24, where mortgage interest is not deductible and is replaced by a 20% tax credit. Returns the tax bill, the 20% credit, cashflow after tax, the extra tax compared with full interest relief, and the same figures for all three tax bands.
Annotations the server declares
- title: Calculate Section 24 tax
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
calculate_stamp_dutyCalculates Stamp Duty Land Tax for a property purchase in England or Northern Ireland at current rates, with the band-by-band breakdown, the effective rate, a comparison across fir…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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Calculates Stamp Duty Land Tax for a property purchase in England or Northern Ireland at current rates, with the band-by-band breakdown, the effective rate, a comparison across first-time buyer, home mover and additional-property (buy-to-let, 5% surcharge) rates, and the total cash needed with the deposit.
Annotations the server declares
- title: Calculate stamp duty (SDLT)
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
check_dealChecks a specific buy-to-let property in England or Wales from its postcode, asking price, type and bedrooms, using live public data: sold prices nearby and a price guide based on …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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Checks a specific buy-to-let property in England or Wales from its postcode, asking price, type and bedrooms, using live public data: sold prices nearby and a price guide based on them, rent (the area average unless given), true net yield and cashflow, stress tests, crime, flood risk and live warnings, coal mining, planning constraints (conservation areas, Article 4, listed buildings), transport, schools and the local rental market. The postcode is the property's, not the user's location. Returns a 0 to 100 score with its parts, flags, a rule-based summary and a link to the full report. Results are educational estimates, not financial advice. Needs the user to sign in to their RealYield account; takes up to 30 seconds.
Annotations the server declares
- title: Check a property listing (Deal Check)
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
define_property_termLooks up a UK property investment or landlord tax term in the RealYield glossary, for example 'ICR', 'Section 24', 'gross yield' or 'void period', and returns the definition with a…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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Looks up a UK property investment or landlord tax term in the RealYield glossary, for example 'ICR', 'Section 24', 'gross yield' or 'void period', and returns the definition with a link to the full entry. Use it when a reader asks what a term in an article means.
Annotations the server declares
- title: Define a property term
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

Only reads 5Looks things up and changes nothing.Claude Code: allow

analyse_buy_to_let_dealFull UK buy-to-let analysis for a purchase price and monthly rent: gross and true net yield after service charge, ground rent, agent fees, repairs, voids and mortgage interest, Sec…No findings
Why it is in this group
- The name "analyse_buy_to_let_deal" says "analyse": a word for reading.
Description, as the server wrote it
Full UK buy-to-let analysis for a purchase price and monthly rent: gross and true net yield after service charge, ground rent, agent fees, repairs, voids and mortgage interest, Section 24 tax, monthly cashflow before and after tax, break-even mortgage rate, a 0 to 100 deal score, and stress scenarios such as a rate shock, a recession and extended voids. Agent fee, repairs and voids the user has not given take standard assumptions, listed in assumptions_applied. Returns a link that opens the same deal in the calculator.
Annotations the server declares
- title: Analyse a buy-to-let deal
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
compare_personal_vs_company_ownershipCompares the annual tax on a UK rental property held personally (Section 24 rules) against holding it in a limited company (corporation tax, then dividend tax on profit extracted).No findings
Why it is in this group
- The name "compare_personal_vs_company_ownership" says "compare": a word for reading.
Description, as the server wrote it
Compares the annual tax on a UK rental property held personally (Section 24 rules) against holding it in a limited company (corporation tax, then dividend tax on profit extracted). Returns net profit and effective tax rate for each structure and which one pays less this year.
Annotations the server declares
- title: Compare personal vs limited company
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
list_realyield_calculatorsLists every UK property calculator on realyield.co.uk with a one-line description and URL.No findings
Why it is in this group
- The name "list_realyield_calculators" says "list": a word for reading.
Description, as the server wrote it
Lists every UK property calculator on realyield.co.uk with a one-line description and URL. Use it to find the right tool for a landlord question before navigating or calculating.
Annotations the server declares
- title: List RealYield calculators
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
lookup_area_rental_yieldsLooks up average rent, average price and gross rental yield for local authority areas in England and Wales, from ONS rents and HM Land Registry prices updated monthly.No findings
Why it is in this group
- The name "lookup_area_rental_yields" says "lookup": a word for reading.
Description, as the server wrote it
Looks up average rent, average price and gross rental yield for local authority areas in England and Wales, from ONS rents and HM Land Registry prices updated monthly. Pass an area name to get its figures and national rank, or leave it out to get the highest-yielding areas, optionally within a region.
Annotations the server declares
- title: Look up rental yields by area
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
search_realyieldSearches realyield.co.uk for calculators, articles, glossary terms and downloadable templates about UK buy-to-let, landlord tax and property regulation.No findings
Why it is in this group
- The name "search_realyield" says "search": a word for reading.
Description, as the server wrote it
Searches realyield.co.uk for calculators, articles, glossary terms and downloadable templates about UK buy-to-let, landlord tax and property regulation. Returns titles, summaries and URLs.
Annotations the server declares
- title: Search RealYield
- 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.

Install

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

claude mcp add --transport http realyield https://www.realyield.co.uk/mcp

Run in a terminal.

Claude Code permissions

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

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__realyield__list_realyield_calculators",
      "mcp__realyield__search_realyield",
      "mcp__realyield__analyse_buy_to_let_deal",
      "mcp__realyield__compare_personal_vs_company_ownership",
      "mcp__realyield__lookup_area_rental_yields"
    ],
    "ask": [
      "mcp__realyield__define_property_term",
      "mcp__realyield__calculate_stamp_duty",
      "mcp__realyield__calculate_section_24_tax",
      "mcp__realyield__calculate_btl_mortgage",
      "mcp__realyield__calculate_capital_gains_tax",
      "mcp__realyield__check_deal"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as realyield. Review it before you use it.

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/uk.co.realyield/realyield/changes.xml

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Source: MCP Registry. Synced Oct 21, 2026, 18:55 UTC.

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