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

With no annotations, the description carries the full burden. It does disclose the output fields (name, what it is best for, tags) and the filtering behavior, which implies a non-mutating query. However, it does not state default behavior without a filter, return format, or any access requirements, leaving partial transparency.

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 description is a single sentence of moderate length, but it contains redundant phrasing ('compared on capability comparison') and grammatical awkwardness ('The options in the Who can...'). Key information is present, but the structure is not polished.

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 tool with two optional parameters and no output schema, the description covers the domain, output fields, and a filter option. It is reasonably adequate but omits filterKey semantics and any guidance on sibling tool selection, so it is not fully complete.

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 description coverage is 0%, so the description must compensate. It explains filterValue as a 'tag value' and notes filtering is optional, but filterKey is not explained at all. This leaves ambiguity about what filterKey represents and how the two parameters interact.

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?

The description clearly identifies a specific resource—options for 'Who can prepare a UK crypto tax position'—and states what is compared (name, what it is best for, tags). It is not a tautology and conveys the tool's core purpose, though it lacks an explicit verb like 'list' or 'return' and does not differentiate from sibling comparison tools.

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?

The description provides domain context and mentions an optional tag filter, but it gives no guidance about when to use this tool instead of compare_criteria or compare_table, and no exclusions. An agent would have to infer usage from the tool name and sibling names.

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