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UK due diligence — Companies House, Charity Commission, Land Registry, Gazette, HMRC VAT

Status
Healthy
Last Tested
Transport
Streamable HTTP
URL
Repository
paulieb89/uk-due-diligence-mcp
GitHub Stars
2
Server Listing
UK Due Diligence

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Tool DescriptionsA

Average 4.4/5 across 16 of 16 tools scored. Lowest: 3.8/5.

Server CoherenceA
Disambiguation5/5

Each tool targets a distinct resource or action: charities, companies, disqualified directors, gazette, land registry, VAT, and prompts. The only potential overlap between `search` (multi-register) and individual searches is clearly disambiguated by descriptions.

Naming Consistency4/5

Most tools follow a domain_verb pattern (charity_search, company_profile), but there are exceptions: `fetch`, `search`, and `gazette_insolvency` (domain_noun). Overall consistent enough to predict tool purpose.

Tool Count5/5

16 tools cover the due diligence domain well—search, profiles, officers, PSC, disqualifications, gazette, land, VAT, and prompts. Each tool serves a clear need without bloat.

Completeness5/5

The set provides a complete read-only due diligence workflow: searching across registers, fetching full profiles, checking officers, PSC, disqualifications, land titles, VAT validation, and gazette insolvency. No obvious gaps for the stated purpose.

Available Tools

16 tools
charity_profileGet Charity ProfileA
Read-onlyIdempotent
Inspect

Fetch the full Charity Commission profile for a charity number.

Returns trustees, latest income/expenditure, insolvency flags, governing document type, classifications, and countries of operation. Use charity_search first to find the charity number.

ParametersJSON Schema
NameRequiredDescriptionDefault
charity_numberYesCharity Commission registration number (e.g. '1234567'). Returned by charity_search.

Output Schema

ParametersJSON Schema
NameRequiredDescription
addressNoRegistered address of the charity (joined address lines).
insolventNoTrue if the charity is flagged as insolvent.
reg_statusNoRegistration status code ('R', 'RM').
charity_nameNoRegistered charity name.
charity_typeNoCharity type.
latest_incomeNoLatest filed annual income in GBP.
trustee_namesNoTrustees on record. Truncated to 30 entries.
charity_numberYesCharity registration number.
who_what_whereNoWho/What/Where classification entries. The list may be truncated truncated to 50 entries.
reg_status_labelNoHuman-readable registration status.
in_administrationNoTrue if the charity is in administration.
latest_expenditureNoLatest filed annual expenditure in GBP.
trustee_names_totalNoTotal trustees upstream before truncation.
date_of_registrationNoDate of first registration.
who_what_where_totalNoTotal classification entries upstream before truncation.
charity_co_reg_numberNoCompanies House number for charities also registered as companies (Charitable Incorporated Organisations, etc.).
countries_of_operationNoCountries the charity operates in (capped at 10 upstream).
trustee_names_truncatedNoTrue if the trustee list was truncated.
who_what_where_truncatedNoTrue if the classification list was truncated.
Behavior4/5

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

Annotations already declare read-only, idempotent, non-destructive. Description adds specific returned fields (trustees, income, etc.), providing additional behavioral context beyond annotations.

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?

Two concise sentences that front-load purpose and then detail returns, with no unnecessary words.

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 simple read-only tool with one parameter and output schema present, description provides all necessary context for agent to use 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 covers parameter fully (100%). Description adds helpful context: format example and that value comes from charity_search, which aids correct invocation.

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?

Clearly states it fetches the full charity profile for a charity number, listing specific data returned. Distinguishes from sibling charity_search by implying that tool finds the number.

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?

Explicitly instructs to use charity_search first to find the charity number, providing clear when-to-use guidance and an alternative.

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

company_officersGet Company OfficersA
Read-onlyIdempotent
Inspect

Fetch active officers for a Companies House company number.

Returns directors, secretaries, and other active officers with appointment dates, nationality, and country of residence. Resigned officers are excluded. Pagination is handled internally — do NOT pass items_per_page or start_index; this tool takes only company_number.

ParametersJSON Schema
NameRequiredDescriptionDefault
start_indexNoIgnored — all officers are returned in one call.
company_numberYesCompanies House company number (8 digits, e.g. '03782379'). Returned by company_search.
items_per_pageNoIgnored — pagination is handled internally. Only accepted to avoid call failures.

Output Schema

ParametersJSON Schema
NameRequiredDescription
totalYesTotal officers returned (filtered by include_resigned).
officersNoOfficer records.
company_numberYesCompanies House company number.
include_resignedYesWhether resigned officers were included in this result.
high_appointment_count_flagNoNumber of active officers with 10+ total appointments, or null if appointment counts were not fetched. Non-zero values are a nominee/phoenix director risk signal.
Behavior5/5

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

Beyond annotations (readOnlyHint, idempotentHint, destructiveHint false), the description reveals that resigned officers are excluded, pagination is internal, and the ignored parameters are accepted only to avoid failures. It adds meaningful behavioral context.

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?

Two succinct sentences plus a clear instruction about parameters. No wasted words, front-loaded with the core action.

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?

Given the presence of an output schema, the description covers what is returned, what is excluded, and how pagination works. It is fully adequate for agent comprehension.

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 baseline is 3. The description adds context for company_number (linking to company_search) and reinforces that the other parameters are ignored, which helps prevent incorrect use.

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 clearly states 'Fetch active officers for a Companies House company number' and specifies the types of officers (directors, secretaries) and fields returned. It distinguishes from siblings like company_profile and company_psc.

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 warns not to pass items_per_page or start_index, stating the tool takes only company_number. While it doesn't explicitly compare with siblings, the guidance is clear and prevents misuse.

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

company_profileGet Company ProfileA
Read-onlyIdempotent
Inspect

Fetch the full Companies House profile for a company number.

Returns status, registered address, SIC codes, filing compliance (overdue accounts and confirmation statement flags), and whether the company has outstanding charges. Use company_search first to find the company number.

ParametersJSON Schema
NameRequiredDescriptionDefault
company_numberYesCompanies House company number (8 digits, e.g. '03782379'). Returned by company_search.

Output Schema

ParametersJSON Schema
NameRequiredDescription
accountsNoAccounts filing status and due dates.
sic_codesNoStandard Industrial Classification codes.
has_chargesNoTrue if the company has outstanding registered charges (secured debt), derived from the /charges endpoint. A due diligence signal.
company_nameNoRegistered company name.
company_typeNoCompanies House company type code.
company_numberYesCompanies House company number.
company_statusNoCurrent status (active, dissolved, in liquidation, etc.).
date_of_creationNoIncorporation date (ISO YYYY-MM-DD).
confirmation_statementNoConfirmation statement filing status and next due date.
registered_office_addressNoRegistered office address as returned by Companies House.
Behavior4/5

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

Annotations declare readOnlyHint, idempotentHint, and destructiveHint. The description adds specific return fields (status, address, SIC codes, filing compliance, charges), providing behavioral context beyond annotations without contradiction.

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?

Two sentences, front-loaded with the main action, listing return fields and usage hint. No extraneous information.

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?

The output schema exists, so return details are not needed. The description covers key fields and usage. It could mention other siblings but is complete enough for a profile tool.

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

Parameters3/5

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

Schema coverage is 100% with a clear description for company_number. The description reinforces the parameter by linking to company_search but adds no new semantic meaning beyond the schema.

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 clearly states 'Fetch the full Companies House profile for a company number' using a specific verb and resource. It distinguishes from siblings like charity_profile and company_search by focusing on company profiles.

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 advises 'Use company_search first to find the company number,' providing clear usage context and a direct reference to a sibling tool. It lacks when-not-to-use guidance but is sufficient.

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

company_pscGet Persons with Significant ControlA
Read-onlyIdempotent
Inspect

Fetch Persons with Significant Control (beneficial ownership) for a company.

Returns PSC entries with natures of control, nationality, and country of residence. Flags overseas corporate PSC entries as a beneficial ownership risk signal. Returns an explanatory note for widely-held PLCs with no registrable PSC.

ParametersJSON Schema
NameRequiredDescriptionDefault
company_numberYesCompanies House company number (8 digits, e.g. '03782379'). Returned by company_search.

Output Schema

ParametersJSON Schema
NameRequiredDescription
pscNoPersons with Significant Control records.
noteNoExplanatory note when total=0. Typical for widely-held listed PLCs where no single person or entity holds 25%+ of shares or voting rights.
totalYesTotal PSC entries returned for this company.
company_numberYesCompanies House company number.
overseas_corporate_psc_flagNoNumber of corporate PSCs registered outside the UK. Non-zero values indicate an offshore beneficial ownership chain.
Behavior4/5

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

Annotations already indicate readOnlyHint, idempotentHint, and non-destructive nature. The description adds behavioral context: it flags overseas entries as risk signals and returns explanatory notes for PLCs without registrable PSC. No contradictions.

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?

Three concise sentences, front-loaded with purpose. Every sentence adds value—no fluff or redundancy. Ideal length for an agent to quickly understand.

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?

Given the single parameter, existing output schema, and comprehensive annotations, the description fully covers the tool's behavior (what it returns, special cases). No gaps for an agent to misinterpret.

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

Parameters3/5

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

The single parameter 'company_number' is well described in the input schema (format, length, example, source). With 100% schema coverage, the description adds no further semantic value, so baseline 3 is appropriate.

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 clearly states the tool fetches Persons with Significant Control for a company, specifying the resource, verb, and return fields (natures of control, nationality, residence, risk flags). It distinguishes from sibling tools like company_officers by focusing on beneficial ownership.

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 provides context on when to use, including special cases like overseas corporate entries and widely-held PLCs. However, it does not explicitly state when not to use or name alternative tools, leaving some ambiguity for agents comparing against siblings.

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

disqualified_profileGet Disqualified Director ProfileA
Read-onlyIdempotent
Inspect

Fetch the full disqualification record for a director by officer ID.

Returns all disqualification orders: reason, Act/section cited, disqualification period, and associated company names. Use disqualified_search first to find the officer ID.

ParametersJSON Schema
NameRequiredDescriptionDefault
officer_idYesCompanies House officer ID. Returned by disqualified_search.

Output Schema

ParametersJSON Schema
NameRequiredDescription
nameNoOfficer name.
surnameNoFamily name, if split upstream.
forenameNoGiven name, if split upstream.
officer_idYesCompanies House officer ID looked up.
nationalityNoDeclared nationality.
officer_kindYesWhich CH endpoint returned the record: 'natural' (individual) or 'corporate' (legal entity).
date_of_birthNoDate of birth on record.
disqualificationsNoAll disqualification orders attached to this officer.
Behavior4/5

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

Annotations already declare readOnlyHint and idempotentHint. The description adds detail on what is returned (all disqualification orders with reasons, periods, etc.), providing additional behavioral transparency beyond annotations.

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?

Two well-structured sentences: first states purpose, second explains return content and prerequisite. No wasted words.

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?

Given the tool's simplicity (one parameter) and the presence of an output schema, the description fully covers what the tool does, how to prepare input, and what to expect in the response.

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 has 100% description coverage and already describes the officer_id parameter. The description adds value by linking the parameter to 'disqualified_search', clarifying its origin.

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 clearly states it fetches the full disqualification record for a director by officer ID. It specifies the verb, resource, and identifier, and distinguishes itself from the sibling 'disqualified_search'.

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?

Explicitly instructs to use 'disqualified_search first to find the officer ID', providing clear when-to-use context and a prerequisite step.

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

fetchFetch Full Record from UK Due Diligence RegisterA
Read-onlyIdempotent
Inspect

Fetch the full record for an ID returned by search.

Routes by prefix to the appropriate register:

  • company:{number} → Companies House full profile

  • charity:{number} → Charity Commission full profile

  • disqualification:{officer_id} → Disqualified director full record

  • notice:{notice_id} → Gazette notice full legal text

ParametersJSON Schema
NameRequiredDescriptionDefault
idYesPrefixed record ID returned by search. Format: company:{number}, charity:{number}, disqualification:{officer_id}, or notice:{notice_id}

Output Schema

ParametersJSON Schema
NameRequiredDescription

No output parameters

Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint. The description adds transparency about routing behavior based on prefix, which is beyond what annotations provide. No contradiction.

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?

Concise and front-loaded: one sentence for purpose, then bulleted list for routing. Every sentence adds value without redundancy.

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?

Given the output schema exists, the description need not explain return values. It thoroughly covers routing logic for all prefix types, making it complete for its purpose.

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% and the parameter 'id' has a detailed description with format examples. The description complements by explaining how prefixes route to different registers, adding context beyond the schema.

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 clearly states the verb 'Fetch' and the resource 'full record for an ID returned by search'. It distinguishes from sibling tools by explaining routing by prefix to different registers.

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?

Explains when to use (after search returns IDs) and provides routing logic for different prefixes. While it doesn't explicitly state when not to use, the context is clear. Alternatives are implicit in the routing but not named.

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

gazette_insolvencySearch Gazette Corporate Insolvency NoticesA
Read-onlyIdempotent
Inspect

Search The Gazette's insolvency notice index by entity name.

Searches the Gazette's insolvency endpoint which covers corporate notice codes: winding-up orders (2443), administration orders (2448), liquidator appointments (2452), striking-off notices (2460), and more. Results are sorted by severity — winding-up orders and administration orders appear first.

Each result includes a notice_numeric_id. Read the full legal wording via the notice://{notice_numeric_id} resource.

The Gazette is the official UK public record. A notice here means the event has been formally published and is legally effective.

ParametersJSON Schema
NameRequiredDescriptionDefault
end_dateNoFilter notices up to this date (YYYY-MM-DD)
start_dateNoFilter notices from this date (YYYY-MM-DD)
entity_nameYesCompany or individual name to search for in Gazette insolvency notices
max_noticesNoCap on notices returned, applied after severity/date sort. Default 20. The Gazette insolvency feed returns up to 100 results per search — raise to 100 to see the full set.
notice_typeNoFilter by notice code (e.g. '2441' winding-up petition, '2443' winding-up order, '2448' administration order, '2460' striking-off). Omit to search all.

Output Schema

ParametersJSON Schema
NameRequiredDescription
noticesNoMatching notices, sorted by severity (desc) then date (desc).
end_dateNoUpper bound of the date range filter, if any.
start_dateNoLower bound of the date range filter, if any.
entity_nameYesEntity name that was searched.
total_noticesYesTotal notices returned after deduplication, sorting, and cap.
max_notices_capYesThe max_notices cap applied. Upstream may have more matching notices.
notice_type_filterNoNotice code filter applied, or null if all codes searched.
Behavior4/5

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

Annotations declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint. The description adds key behaviors: results are sorted by severity, covers specific notice codes, and that a notice in The Gazette is legally effective. No contradictions.

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?

Seven sentences, each contributing meaningfully: purpose, codes, sorting, usage of notice ID, legal significance. No redundant or vague phrases.

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?

Given 5 parameters and an output schema, the description covers purpose, usage, filters, result interpretation, and legal context. It fully enables correct tool 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?

Schema coverage is 100% and parameters are well-described. The description adds value by explaining sort order, the importance of notice_numeric_id, and how to access full legal wording via notice:// resource, exceeding baseline 3.

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 clearly states the tool searches The Gazette's insolvency notice index by entity name. It lists specific notice codes covered, distinguishing it from sibling tools like gazette_notice (which reads a specific notice) and other search tools.

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 explains when to use (search by entity name, with date and type filters) and hints at when to use the sibling gazette_notice (to read full wording via notice_numeric_id). However, it does not explicitly state when not to use this tool or list alternatives.

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

gazette_noticeGet Gazette Notice Full TextA
Read-onlyIdempotent
Inspect

Fetch the full legal wording of a Gazette notice by numeric notice ID.

Returns the complete JSON-LD linked-data record for the notice: parties, legal basis, court, and full text. Use gazette_insolvency first to find notice_numeric_id values.

ParametersJSON Schema
NameRequiredDescriptionDefault
notice_idYesNumeric Gazette notice ID. Returned as notice_numeric_id by gazette_insolvency.

Output Schema

ParametersJSON Schema
NameRequiredDescription

No output parameters

Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, etc. Description adds that it returns a 'complete JSON-LD linked-data record' with parties, legal basis, court, and full text, which is valuable beyond the annotations.

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?

Two sentences, each earning its place: first for purpose, second for return content and usage guidance. Front-loaded and no extraneous text.

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?

Given an output schema exists, the description need not explain return values. It covers the purpose, prerequisite, and parameter origin. Complete for a simple one-param tool with rich annotations.

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

Parameters3/5

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

Schema coverage is 100%, so baseline is 3. The description restates that notice_id is numeric and mentions the sibling tool for finding it, which adds slight context but doesn't significantly enhance understanding beyond the schema description.

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?

Description clearly states 'Fetch the full legal wording of a Gazette notice by numeric notice ID.' It specifies the verb, resource, and input. It distinguishes from sibling gazette_insolvency by positioning it as a prerequisite tool.

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?

Provides explicit instruction: 'Use gazette_insolvency first to find notice_numeric_id values.' This tells the agent the correct workflow. Missing explicit when-not-to-use or alternatives, but the context is clear.

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

get_promptAInspect

Get a prompt by name with optional arguments.

Returns the rendered prompt as JSON with a messages array. Arguments should be provided as a dict mapping argument names to values.

ParametersJSON Schema
NameRequiredDescriptionDefault
nameYesThe name of the prompt to get
argumentsNoOptional arguments for the prompt

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes
Behavior3/5

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

No annotations exist, so description carries full burden. It does disclose the output format ('JSON with a messages array'), but omits behavioral details like side effects, rate limits, or error handling. Adequate for a simple read operation.

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?

Three sentences, front-loaded with purpose, no redundant information. Every sentence is meaningful.

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?

Has an output schema (though not detailed here), and description partially explains return format. For a tool with 2 params and no nested objects, the description is fairly complete, though missing notes on error scenarios.

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% (both parameters described in schema). The description adds value by specifying that arguments should be a dict mapping names to values, which goes beyond the schema's generic 'Optional arguments for the prompt'.

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 clearly states the verb 'get', the resource 'prompt by name', and mentions optional arguments. It distinguishes from sibling 'list_prompts' which likely returns all prompts, while this retrieves one by name.

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

Usage Guidelines2/5

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

No explicit guidance on when to use this tool versus alternatives (e.g., list_prompts). No mention of prerequisites, appropriate contexts, or when not to use.

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

list_promptsAInspect

List all available prompts.

Returns JSON with prompt metadata including name, description, and optional arguments.

ParametersJSON Schema
NameRequiredDescriptionDefault

No parameters

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes
Behavior3/5

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

With no annotations, the description carries the full behavioral burden. It discloses that the tool returns JSON with name, description, and optional arguments, but omits details like read-only nature, side effects, or performance characteristics.

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?

Two sentences, front-loaded with the verb 'List', and every word adds value. No redundant or extraneous information.

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 simple list tool with no parameters and an existing output schema, the description covers the essential return fields (name, description, optional arguments). It is sufficiently complete for an agent to understand the tool's purpose and output.

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 input schema has 0 parameters, so baseline is 4. The description adds no parameter info, but none is needed; it does mention 'optional arguments' in the output, which subtly indicates the output structure.

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 clearly states the verb 'List' and the resource 'all available prompts', distinguishing it from sibling tools like 'get_prompt' which targets individual prompts.

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?

Provides clear context for when to use the tool (listing all prompts) but does not explicitly exclude scenarios or mention alternatives like 'get_prompt' for individual prompt retrieval.

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

vat_validateValidate UK VAT Number (HMRC)A
Read-onlyIdempotent
Inspect

Validate a UK VAT number against the HMRC register.

Returns the trading name and address as registered with HMRC for VAT purposes. The VAT-registered trading address often differs from the Companies House registered address — that discrepancy is a due diligence signal worth noting.

ParametersJSON Schema
NameRequiredDescriptionDefault
vat_numberYesUK VAT registration number. Accepts: 'GB123456789', '123456789', 'GB 123 456 789'. GB prefix and spaces normalised automatically.

Output Schema

ParametersJSON Schema
NameRequiredDescription
validYesTrue if HMRC confirmed the VAT number is currently registered. False means HMRC returned 404 (not registered / deregistered).
vat_numberYesCanonical VAT number in 'GB<9 digits>' format.
trading_nameNoTrading name registered with HMRC for VAT. Compare with the Companies House name — discrepancies are a due diligence signal.
registered_addressNoVAT-registered trading address. May differ from the Companies House registered office address.
consultation_numberNoHMRC consultation reference number for this lookup.
Behavior4/5

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

Annotations already indicate read-only, idempotent, and non-destructive behavior. The description adds that it returns trading name and address and notes a common discrepancy, providing useful context beyond annotations.

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?

Three sentences with no unnecessary words. Every sentence provides value: purpose, return value, and a due diligence note.

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?

Given the output schema exists, the description sufficiently covers what the tool does and returns. The added note about address discrepancy is valuable context.

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

Parameters3/5

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

The input schema has 100% coverage on the sole parameter, so the description does not need to add detail. The schema already describes the parameter, so a baseline score of 3 is appropriate.

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 clearly states the action ('validate') and the resource ('UK VAT number against the HMRC register'). It distinguishes from sibling tools that focus on charity or company info.

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 implies usage for VAT validation and notes return value, but does not explicitly state when to use or not use vs alternatives. Sibling tools are different, so context is clear.

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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