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

No annotations exist, so the description carries the full behavioral burden. It does disclose the $0.05 paid cost and the shape of what comes back (list version, date, freshness), which is valuable, but it says nothing about permissions/subscriber token requirement, rate limits, or error behavior for unknown references.

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 with the cost front-loaded and the accepted ID regimes enumerated before the return contents. Nothing is padded and no clause is redundant.

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?

With no output schema, the description does give a minimal return-value sketch (list version, date, freshness), which is more than many. Still missing for a paid lookup tool: what a 'full record' actually contains, auth expectations, and failure modes for a reference not found.

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?

Schema coverage is only 50% (id is bare), but the description compensates by supplying concrete accepted identifier formats (EU.27.28, CDi.001) and mentioning UK unique IDs. It adds real meaning beyond the schema for the undocumented required parameter.

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?

States a specific verb+resource ('Full record') and constrains the input to EU FSF, UN, or UK unique reference identifiers with concrete examples. It partially separates itself from siblings like entity_detail and lei_lookup by naming the identifier regimes it accepts, though it never explicitly contrasts with them.

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 only implied by the input formats ('use this when you hold an EU.27.28-style or CDi.001-style reference'), and the PRO/$0.05 tag hints at a paid tier. No explicit when-not-to-use guidance or named alternatives among the ten sibling tools are given.

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