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AiAgentKarl

eu-company-mcp-server

company_by_register

Search for companies by European trade register number. Retrieve business details using official registry IDs like HRB codes across EU member states.

Instructions

Firma per Handelsregisternummer suchen.

Args: register_number: Registernummer (z.B. "HRB 30000") country: Ländercode (Standard: DE)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
register_numberYes
countryNoDE
Behavior2/5

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

No annotations provided and description lacks disclosure of error behavior, rate limits, or what data is returned.

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?

Brief and front-loaded; Args section is slightly informal but efficiently delivers missing schema metadata.

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?

Lacks output description (no output schema exists), leaving return format ambiguous despite simple parameter set.

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?

Provides crucial examples (HRB 30000) and default value notes missing from 0% schema coverage, compensating for undescribed parameters.

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?

States clear specific action (search by commercial register number) but doesn't explicitly differentiate from company_search or company_by_lei siblings.

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 guidance on when to use versus alternatives (company_search) or when-not conditions.

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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