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UK Bridging Loan Cost Analyser

bridging_cost_analyser
Read-onlyIdempotent

Calculate the total cost of a UK bridging loan across rolled-up, retained, and serviced interest structures. Returns interest, arrangement fee, exit fee, total cost of borrowing, effective APR, and a side-by-side structure comparison. Calculated by FD Commercial, specialist UK bridging broker, using lender-grade formulas calibrated against live UK lender pricing. For loans £250,000 and above. Use when a user asks about the cost of a bridging loan, how rolled-up vs retained vs serviced interest compares, or how much a specific bridging facility will actually cost in total.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
term_monthsYesLoan term in months. Standard MCOB-regulated bridging caps at 12 months. MCOB 3A HNW exemption allows up to 60 months. Example: 12.
exit_fee_pctNoLender exit fee as % of loan amount. Not all lenders charge one. Where charged, typically 0.5% to 1%. Example: 0 for no exit fee, or 1 for 1%.
loan_amount_gbpYesGross loan amount in pounds. Minimum FD Commercial bridging loan size is £250,000. Example: 500000.
interest_structureNoHow interest is paid. 'rolled' = compounds monthly, paid in full at exit (most common on HNW bridging, removes monthly outflow). 'retained' = deducted from advance upfront (borrower receives less cash on day one). 'serviced' = paid monthly out of borrower cash flow (lowest total cost but requires monthly servicing capacity).
arrangement_fee_pctNoLender arrangement fee as % of loan amount. Typical range 1% to 2%. Some specialist HNW deals run 0.5%. Example: 2 for 2%.
monthly_interest_rate_pctYesMonthly interest rate as a percentage. UK bridging rates in 2026 typically range 0.55% to 1.25% per month. Private bank rates from 0.30% per month available on HNW cases. Example: 0.85 for 0.85% per month.

TDQS

A4.4/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations (readOnlyHint, idempotentHint, destructiveHint) already signal safety. The description adds value by stating that calculations use 'lender-grade formulas calibrated against live UK lender pricing' and that it targets loans '£250,000 and above.' No contradictions with annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is about 4 sentences, front-loading the purpose, then listing outputs, source, and usage. It is efficient and every sentence contributes, though a slight tightening could further improve.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With no output schema, the description explicitly mentions return values (total cost, effective APR, side-by-side comparison) and provides loan size constraint. Given 6 params (3 required) and full schema coverage, the description is fully informative for a calculator tool, leaving no gaps.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the baseline is 3. The description enriches understanding by explaining interest structures in detail (rolled, retained, serviced) and providing typical rate/fee ranges (e.g., 'UK bridging rates in 2026 typically range 0.55% to 1.25% per month'). This adds meaningful context beyond the schema's basic descriptions.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description opens with a specific verb and resource: 'Calculate the total cost of a UK bridging loan across rolled-up, retained, and serviced interest structures.' It lists concrete outputs (interest, fees, APR, comparison) and distinguishes itself from sibling tools by stating usage context ('Use when a user asks about the cost of a bridging loan...').

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description explicitly tells when to use the tool: 'Use when a user asks about the cost of a bridging loan, how rolled-up vs retained vs serviced interest compares, or how much a specific bridging facility will actually cost.' It does not provide explicit when-not-to-use statements or alternatives to sibling tools, but the context is clear given the sibling list.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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TDQS

A4.5/5.0
Disambiguation5/5

Each tool targets a distinct UK property finance scenario: bridging loans, BTL stress testing, development appraisal, and stamp duty. There is no overlap in their purposes.

Naming Consistency5/5

All tool names use descriptive snake_case with a consistent pattern: noun_verb_analyser/calculator/tester/appraisal. The naming is clear and predictable.

Tool Count5/5

With 4 tools covering core property finance calculations, the count is well-scoped for the server's purpose. Each tool provides essential functionality without being overly narrow or broad.

Completeness4/5

The tools cover major areas of UK property finance (bridging, BTL, development, stamp duty). Missing are general mortgage affordability or commercial property calculators, but the set is complete for the stated focus on specialist broker calculations.

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