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

Annotations already declare readOnly/idempotent/non-destructive, so the safety profile is covered. The description adds real value beyond annotations by disclosing the return shape (maker, country, official store, maker's description, link) and that records are sourced, which matters because there is no output schema. No mention of result ordering or pagination behavior beyond limit.

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?

Three tight sentences: purpose first, then usage triggers, then return shape and query mechanics. Every sentence carries distinct information and nothing is repeated wastefully.

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 compensates by enumerating the returned fields and stating records are sourced. Combined with annotation coverage and full schema docs, an agent has everything needed to call this correctly.

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 both parameters are documented in the schema, including the 'Empty returns all' behavior and the default/max limit. The description largely restates the query semantics rather than adding new meaning, so 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+resource pair ('Search and compare hardware wallets') and scopes it with concrete makers (BitBox, Ledger, Trezor). It does not explicitly name the sibling get_hardware_wallet as the alternative for single-wallet lookups, so sibling differentiation is only implied.

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 clear trigger scenarios ('user asks which hardware wallet to buy', comparison requests, specific maker questions) and explains the empty-query behavior for listing all makers. It stops short of stating when NOT to use this versus get_hardware_wallet for detail on one device.

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