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Towing Capacity Checker: the site's own MCP server — checker, enquiry (enquiry = a human...

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Status
Healthy
Uptime
99.4% over 40 days
Last Tested
Transport
Streamable HTTP · MCP 2025-11-25
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TDQS

A4/5.0

Scored across 6 tools

Disambiguation4/5

Each tool has a fairly distinct role: checker_start begins the guide, checker_answer advances it, checker_tree dumps the whole tree, enquiry_describe/enquiry_fields expose the enquiry spec, and submit_enquiry submits. The main risk is overlap between checker_start and checker_tree (both effectively bootstrap the guide), but descriptions clarify the intent.

Naming Consistency4/5

Names follow a namespace-prefix convention (checker_*, enquiry_*) plus submit_enquiry, which is readable and predictable. The one deviation is submit_enquiry using a verb_noun form rather than an enquiry_* prefix, but overall it stays coherent.

Tool Count5/5

Six tools is well-scoped for a decision-guide-plus-enquiry domain, with each tool earning its place (guide traversal, tree reference, enquiry schema, and submission). No redundant or filler tools.

Completeness5/5

The surface covers the full lifecycle: discover the guide (start/tree), walk it (answer), learn the enquiry contract (describe/fields), and submit with consent. No obvious missing operation or dead end.

Available Tools

6 tools
checker_answerAnswer a question, get the next stepAInspect

Given a question id and the chosen option (its choice index), return the next question or the final verdict.

ParametersJSON Schema
NameRequiredDescriptionDefault
choiceYes
questionYes

TDQS

A3.9/5.0
Behavior3/5

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

With no annotations, the description carries the full burden. It does disclose the key behavior—returning either the next question or a final verdict—but it does not mention whether the flow state is mutated, what happens for invalid choices, or any session/state requirements.

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

Conciseness5/5

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

A single, information-dense sentence. The title and description work together without repetition or filler, and the key input/output behavior is front-loaded.

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

Completeness3/5

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

Adequate for a two-parameter tool: it names both inputs and describes the possible return. However, with no output schema and no annotations, it falls short of fully describing the response shape, error behavior, or what the caller should do with the returned next question/final verdict.

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?

The schema has 0% description coverage, so the description's clarification that `question` is a question id and `choice` is the chosen option's index is essential. It adds meaning beyond the raw property names and types, though it omits details like how to obtain valid question ids or bounds beyond minimum 0.

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 states a specific operation: given a question id and a choice index, return the next question or final verdict. This clearly differentiates it from sibling tools like checker_start or checker_tree, which have different roles in the flow.

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

Usage Guidelines3/5

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

Usage is implied: use this when a user has answered a question and the flow should advance. However, it does not explicitly state when not to use it, what prerequisites exist (e.g., starting with checker_start), or how it relates to alternatives.

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

checker_startStart: Towing capacity checkerBInspect

The first question of the Towing capacity checker decision guide.

ParametersJSON Schema
NameRequiredDescriptionDefault

No parameters

TDQS

B3.4/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only states that the tool is the first question; it does not disclose whether invoking it initializes or resets state, whether it has side effects, or what the returned question looks like.

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

Conciseness5/5

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

A single sentence that is immediately clear and contains no filler. It front-loads the core purpose in minimal space.

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

Completeness3/5

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

For a no-parameter start tool this is near-adequate, but because there is no output schema and no annotations, an agent still lacks details on the return format and the expected next step after the first question. The sibling names hint at a flow, but the description itself does not complete the picture.

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?

The tool has zero parameters and the schema is fully covered, so the description does not need to add parameter meaning. This meets the zero-parameter baseline.

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

Purpose4/5

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

The description identifies the tool as the first question of the Towing capacity checker decision guide, making its role as the entry point clear. It does not explicitly differentiate it from siblings like checker_answer or checker_tree, but 'first question' conveys enough to avoid confusion.

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

Usage Guidelines3/5

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

Use at the start of the checker is implied by 'first question,' but there is no explicit guidance about when to choose this tool over checker_answer or checker_tree, nor any mention of prerequisites or exclusions. The usage context is implied rather than stated.

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

checker_treeThe whole decision treeAInspect

Every question, option and verdict of the Towing capacity checker guide, for reasoning end to end.

ParametersJSON Schema
NameRequiredDescriptionDefault

No parameters

TDQS

A3.7/5.0
Behavior3/5

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

With no annotations provided, the description must carry the behavioral transparency burden. It does convey that the tool exposes the complete set of questions, options, and verdicts, which implies a read-oriented, full-content response. It does not mention output format, potential size, or whether this is a static representation versus an interactive guide.

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

Conciseness5/5

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

The description is a single, efficiently worded sentence. It front-loads the content scope and immediately adds the end-to-end reasoning purpose. Every phrase earns its place with no redundancy or filler.

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

Completeness4/5

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

For a zero-parameter tool with no output schema, the description reasonably covers what the tool is and what it returns. It could be more complete by noting how the tree should be used alongside checker_answer and checker_start, or by describing the response format, but it is sufficient for basic selection and invocation.

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?

There are zero parameters, so the schema coverage is effectively complete. The description correctly focuses on the returned content rather than parameter details, which are unnecessary here. The baseline for no-parameter tools applies.

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

Purpose4/5

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

The description clearly states what content the tool provides: every question, option, and verdict of the Towing capacity checker guide. This identifies a specific resource and distinguishes it as the whole tree, though it lacks an explicit verb like 'return' or 'retrieve' and does not name sibling tools.

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

Usage Guidelines3/5

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

The phrase 'for reasoning end to end' implies when this tool should be used: when the agent needs the full decision structure rather than a single step. However, it does not explicitly exclude alternatives like checker_answer or checker_start, nor explain how the tree relates to them.

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

enquiry_describeWhat you get: an ENQUIRY with a human (not a purchase, not a guaranteed quote)AInspect

Read first. States plainly what submit_enquiry does on Towing Capacity Checker: 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.

ParametersJSON Schema
NameRequiredDescriptionDefault

No parameters

TDQS

A4.4/5.0
Behavior4/5

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

With no annotations provided, the description carries the burden of behavioral disclosure. It usefully states that nothing is bought, ordered, or paid, no quote is guaranteed, and the enquiry is free, which prevents costly missteps. It also discloses what the tool returns: recipient details, consent wording, and confirmation behavior. It does not explicitly say 'this tool itself sends nothing', but its informational nature is strongly implied.

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 short and front-loaded with 'Read first', which gives immediate usage priority. The caveats are packed efficiently. There is mild redundancy with the title ('not a purchase, not a guaranteed quote' appears in both), but the description remains compact and each clause earns its place.

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?

For a zero-parameter, informational tool with no output schema, the description is complete: it explains what the tool is for, reassures about cost and commitment, names the sibling that actually submits, and lists the key content returned. An agent has everything needed to decide when to call it and what to expect back.

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?

The tool has zero parameters, so the schema already trivially covers 100% of inputs. The description adds context about what the returned explanation covers, which is reasonable. There is no parameter burden for the description to carry beyond this.

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 names the specific resource (an ENQUIRY on Towing Capacity Checker) and the tool's job: to state plainly what submit_enquiry does, i.e., describe the outcome before anything is submitted. The title reinforces this by framing it as 'What you get'. It is clearly distinguished from sibling tools like submit_enquiry and checker_answer because it is positioned as the 'read first' explainer.

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 opening imperative 'Read first' explicitly tells the agent to use this before acting on the enquiry flow. It also clarifies that this is not a purchase or guaranteed quote and names submit_enquiry as the actual submission sibling. It could more explicitly say 'use submit_enquiry only after this is read', but the intent is clear.

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

enquiry_fieldsThe questions the enquiry asksAInspect

Every field of the Towing Capacity Checker 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.

ParametersJSON Schema
NameRequiredDescriptionDefault

No parameters

TDQS

A3.9/5.0
Behavior3/5

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

With no annotations, the description carries the burden of behavioral disclosure. It describes the data content of the tool (keys, labels, types, etc.) and implies a read-only lookup, but does not explicitly state that it has no side effects or describe the response format. This is adequate but not fully transparent.

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

Conciseness5/5

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

The description is two sentences: the first states exactly what the tool provides, and the second gives the follow-up action. It is concise, front-loaded, and every word contributes value.

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

Completeness4/5

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

For a zero-parameter tool with no output schema, the description adequately communicates what the agent will receive: field definitions including keys, labels, types, required flags, help text, and options. It could explicitly mention the return shape (e.g., an array or object), but the given content is sufficient for correct usage.

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?

The tool has zero parameters and an empty input schema, so the baseline for parameter semantics is 4. The description adds value by explaining how the output keys relate to submit_enquiry, which indirectly clarifies the output schema's purpose.

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

Purpose4/5

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

The description clearly identifies the resource as every field of the Towing Capacity Checker enquiry and enumerates the attributes included (key, label, type, required, help text, allowed options). It lacks an explicit verb like 'lists' or 'returns', and does not directly differentiate from siblings such as enquiry_describe, but the scope is unambiguous.

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 second sentence gives concrete usage context: 'Pass answers to submit_enquiry keyed by field key,' which tells the agent how the output should be consumed. It does not explicitly mention when to avoid this tool or name alternatives, but the connection to submit_enquiry provides clear practical guidance.

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

submit_enquirySubmit an ENQUIRY to human providers (two steps; not a purchase)AInspect

Submits an enquiry to Towing Capacity Checker — 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 local towbar fitters or towing specialists, chosen by Towing Capacity Checker, 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."

ParametersJSON Schema
NameRequiredDescriptionDefault
answersYesthe person's answers, keyed by field key
consentYestrue only when the person has agreed to: Send my contact details to up to three local towbar fitters or towing specialists, chosen by Towing Capacity Checker, 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.
confirmationNothe confirmation token from step 1, after the person has approved the summary

TDQS

A4.8/5.0
Behavior5/5

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

No annotations are provided, so the description carries the full behavioral burden — and it does: it discloses the two-step validation flow, that step 1 returns a summary/consent line/token, and the downstream consequence (an email link the person must click before any provider sees the data). It also spells out the exact consent meaning, which is critical for a mutation that shares personal data.

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?

Front-loaded with the crucial negation, then cleanly partitioned into Step 1 / Step 2. Minor redundancy: the full consent string is reproduced verbatim even though it already appears identically in the schema description for 'consent', so that sentence earns less than its length.

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 correctly fills that gap by naming what step 1 returns (summary, consent line, token) and what happens post-submission. For a two-step, data-sharing mutation tool this covers everything an agent needs to drive the interaction correctly.

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% (baseline 3), but the description adds real meaning: 'answers' is keyed by field keys from the enquiry_fields sibling, and 'confirmation' is the token returned from step 1 — a sequencing relationship the schema's flat 'confirmation token from step 1' note only partially conveys. Consent semantics are fully explained.

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?

States a specific verb and resource ('Submits an enquiry to Towing Capacity Checker') and immediately scopes it by negation ('NOT a purchase, NOT a guaranteed quote'). This distinguishes it from the checker_* siblings and from any purchase flow without needing the schema.

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

Usage Guidelines5/5

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

Gives explicit step-by-step when-to-use: step 1 with answers + consent=true, step 2 only 'if the person agrees' with the same answers plus the confirmation token. The gating condition between the two calls is stated, not inferred.

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

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

  1. 1 tool update
    • Changedsubmit_enquiry1 field changed
      • changedInput schema / properties / consent / description
        Previous value: -"true only when the person has agreed to: Happy for my details to go to a local towbar fitter or towing specialist, who'll contact me directly."New value: +"true only when the person has agreed to: Send my contact details to up to three local towbar fitters or towing specialists, chosen by Towing Capacity Checker, 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."
  2. 6 tool updates
    • First observedchecker_answer
    • First observedchecker_start
    • First observedchecker_tree
    • First observedenquiry_describe
    • First observedenquiry_fields
    • First observedsubmit_enquiry

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