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stefanoamorelli

Companies House MCP Server

get_charges

Retrieve all charges registered against a UK company using its company number. Supports pagination to browse results.

Instructions

Get charges registered against a specific company

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
start_indexNoStarting index for pagination
company_numberYesThe company number
items_per_pageNoNumber of results per page (1-100)
Behavior2/5

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

No annotations provided. Description only states what it does but not behavioral traits like pagination, result format, or whether it returns a list. Minimal disclosure beyond the basic action.

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?

Single sentence with no unnecessary words, effectively communicates the core purpose.

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

Completeness2/5

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

Despite 3 parameters and no output schema, description omits crucial context like pagination behavior, default values, and how to interpret the response. Schema covers parameters but description should tie them together.

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 100%, so baseline is 3. Description adds no additional meaning beyond what's already in the schema for parameters.

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 uses specific verb 'get' and resource 'charges registered against a specific company', clearly distinguishing it from sibling tools like 'get_charge_details'.

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?

No explicit when-to-use or alternatives mentioned. The sibling 'get_charge_details' exists for single charge details, but description does not guide selection.

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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