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Stealth-Labs-LTD

GovUK MCP Server

search_companies

Search for UK companies by name using Companies House API. Configure results per page to fit your needs.

Instructions

Search for UK companies by name using Companies House API.

Args: query: Company name to search for items_per_page: Number of results to return (default: 20)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
queryYes
items_per_pageNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior3/5

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

With no annotations, the description carries full transparency burden. It discloses the external API source but omits behavioral traits such as rate limits, result pagination, matching behavior (exact vs. fuzzy), or error conditions. Minimal but not misleading.

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 extremely concise, with two sentences plus an argument list. The purpose is front-loaded and every word serves a purpose. No redundancy.

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?

Given the tool's low complexity and presence of an output schema, the description is adequate but incomplete. It lacks details on pagination, result limits, and potential errors, which would aid the agent in fully understanding the tool's behavior.

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 description coverage is 0%, so the description must compensate. It adds basic context ('Company name to search for', 'Number of results to return (default: 20)') but does not elaborate on format, search behavior, or constraints for 'items_per_page'. Slightly above baseline.

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 for UK companies by name using the Companies House API. It effectively distinguishes from sibling tools which target different entities (e.g., courts, charities, hospitals).

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 is provided on when to use this tool versus alternatives like 'get_company' for single lookups. The description does not mention when not to use this tool or any prerequisites.

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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