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

With no annotations, the description carries the full behavioral burden. It does add one genuinely valuable disclosure — an empty field means unmeasured, not zero or bad, and unpublished numbers are not invented — which shapes how results must be interpreted, but it says nothing about permissions, output format, limits, or failure modes.

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?

Short and front-loaded: the comparison scope leads, the interpretation caveat follows. The conversational tone ('we can actually stand behind') costs a little precision but consumes no real bulk.

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 comparison tool with no annotations or output schema, the description covers both what is compared and how to read missing values, which largely substitutes for the absent output schema. It stops short of identifying what kind of entity an id refers to.

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 id_uri parameter is already documented with the 2-to-6 range. The description's 'two or more things' loosely echoes the schema without adding new meaning about what an id is or where it comes from.

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 clear verb+resource (put two or more things next to each other) and enumerates exactly which fields are compared: price, inputs/outputs, requirements, invocation, and measurements. That is specific enough to distinguish it from the search/discovery siblings, though it never names 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?

Conveys only an implied usage ('compare things'), with no statement of when to reach for this versus cauta_pe_raft, vezi_produsul, or the other siblings, and no prerequisites or exclusions. An agent must infer the trigger condition entirely.

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