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

With no annotations, the description carries the full behavioral burden, and it does disclose one concrete trait: results are capped at 50 matches. It says nothing about whether results are ordered, whether more results are retrievable, or whether the operation is read-only, leaving meaningful gaps for an unannotated tool.

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?

Two tight sentences with zero filler; the purpose is front-loaded and the result cap follows immediately. Every clause earns its place.

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 single-parameter search tool with no output schema, the description covers purpose, valid category examples, and result size, which is most of what an agent needs. Minor omissions (ordering, exhaustiveness of the 50-match cap) keep it from a 5.

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 100% and the schema already enumerates the full category list (exchange, bridge, protocol, scam, nft, defi, other). The description's examples duplicate rather than extend that, 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?

The description states a specific verb and resource ('Search all labeled addresses by category') and names example values, so the agent knows exactly what the tool returns. It does not explicitly differentiate itself from the sibling get_address_label, which appears to be the closest related tool, so it falls short of a 5.

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 implied: use this when you want to enumerate labeled addresses of a given category rather than look up one known address. However, there is no explicit when-to-use/when-not guidance and no named alternative such as get_address_label for single-address lookups.

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