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Server Details
Towing Capacity Checker: the site's own MCP server — checker, enquiry (enquiry = a human...
- Status
- Healthy
- Uptime
- 99.1% over 22 days
- Last Tested
- Transport
- Streamable HTTP · MCP 2025-11-25
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TDQS
Scored across 6 tools
The checker_start, checker_answer, and checker_tree tools are closely related, but their roles are clearly distinguished: start gives the first question, answer traverses the guide, and tree provides the full structure for end-to-end reasoning. The enquiry tools are also distinct, though checker_start and checker_tree could be confused by an agent looking for the initial question.
Names mostly follow a clear domain-prefix pattern: checker_* for the decision guide and enquiry_* for enquiry metadata. submit_enquiry is a minor deviation since it uses verb_noun instead of the enquiry_ prefix, but the overall naming is readable and predictable.
Six tools is well-scoped for this server's purpose: three tools cover the towing capacity decision guide and three cover the enquiry submission flow. Each tool has a clear role with no redundant extras or overwhelming surface area.
The tool set fully covers the two core workflows: navigating and reasoning through the decision guide (start, answer, tree) and submitting a consent-based enquiry (describe, fields, submit). The two-step submission with confirmation token is handled within submit_enquiry, so there are no obvious dead ends or missing operations.
Available Tools
6 toolschecker_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.
| Name | Required | Description | Default |
|---|---|---|---|
| choice | Yes | ||
| question | Yes |
TDQS
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.
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.
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.
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.
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.
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.
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
TDQS
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.
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.
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.
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.
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.
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.
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
TDQS
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.
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.
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.
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.
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.
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.
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
TDQS
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.
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.
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.
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.
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.
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.
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
TDQS
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.
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.
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.
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.
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.
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: "Happy for my details to go to a local towbar fitter or towing specialist, who'll contact me directly."
| Name | Required | Description | Default |
|---|---|---|---|
| answers | Yes | the person's answers, keyed by field key | |
| consent | Yes | 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. | |
| confirmation | No | the confirmation token from step 1, after the person has approved the summary |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description fully communicates the tool's behavioral contract: two-step validation, summary and consent-line return, confirmation token reuse, email with a required click-through, and the exact consent wording. It also discloses that providers only see the enquiry after the person clicks the emailed link.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Although lengthy, the description is efficiently structured with numbered steps and front-loaded disclaimers. Every sentence adds necessary operational detail, and the consent line is quoted exactly, reducing ambiguity for the agent.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
The two-step flow, required inputs, returned values, consent semantics, and post-submission email behavior are all fully explained. There is no output schema, so the description's coverage of expected returns and side effects is sufficient for correct invocation.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The schema already describes all three parameters, so the baseline is 3. The description adds valuable workflow semantics beyond the schema: answers come from enquiry_fields, consent=true is mandatory in both steps, and confirmation is the token returned in step 1. This clarifies how the parameters relate across the two-step call sequence.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool 'Submits an enquiry to Towing Capacity Checker' and explicitly differentiates it from a purchase or guaranteed quote. The two-step nature and human-provider target are immediately evident, distinguishing it from the sibling checker_* tools.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides clear step-by-step guidance on when and how to call the tool, including requiring consent=true and reusing the confirmation token in step 2. It does not explicitly name sibling alternatives or state when not to use this tool, but the unique submission purpose and detailed flow make usage clear.
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.
6 tool updates
- First observed
checker_answer - First observed
checker_start - First observed
checker_tree - First observed
enquiry_describe - First observed
enquiry_fields - First observed
submit_enquiry
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