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

Annotations already declare readOnly=false, destructive=false and idempotent=true, so the safety profile is covered. The description adds genuinely useful context beyond that: the endpoint, the gating relationship to live-key screening, and the regulatory reason the field exists. It doesn't mention validation failures or whether a post-screening name change is permitted, but against existing annotations this is solid.

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?

The operation and prerequisite are front-loaded, which is good. However, the trailing explanation about Voll Studios Ltd and DMA licensing is backstory that doesn't change how the agent invokes the tool, and it takes up roughly half the text.

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?

For a one-parameter setter with full schema coverage and clear annotations, the description supplies the one thing structured fields can't: that this must be called before a live key can screen. Nothing essential to correct invocation is missing.

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 100% and the single property already documents 'the legal name of the client business' with an example and length bounds. The description's phrase 'legal name' restates the schema rather than adding new semantics, so the baseline 3 applies.

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 and resource ('Set the legal name of the business this account screens numbers for') and even names the underlying endpoint PATCH /v1/me. It is clearly distinguishable from siblings like get_account or screen_numbers, which read or act on numbers rather than configuring the account identity.

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?

Gives a concrete prerequisite: 'Required before a live key can screen,' which tells the agent when this call is mandatory rather than optional. It does not discuss what to do if the name is already set or whether it can be changed later, so it stops short of full when/when-not guidance.

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