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

With no annotations present, the description carries the full burden of disclosing behavior, but it only states that a catalog exists. It does not mention side effects, output shape, error behavior, or the fact that most inputs are 'discarded' after checks. The schema's param-level notes reveal some behavior, but the description itself adds no 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 brief but under-specified rather than efficiently informative. It has no wasted words, yet it also lacks any operational anchoring; for a tool with seven diverse parameters and no other context, this brevity is closer to incompleteness than to good concision.

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?

The description is far too short for a tool with seven heterogeneous parameters, no output schema, and a large sibling set. It does not explain what the tool returns, which parameter should be supplied, how the catalog relates to the inputs, or when it should be preferred over a sibling. An agent cannot invoke this correctly based on the description alone.

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?

The tool description itself says nothing about parameters, but the input schema provides descriptions for all seven properties, so schema coverage is high. Per the baseline rule, this earns a 3 because the schema carries the semantic weight, even though the description does not explain why parameters like city or feed relate to HTTP status codes.

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 'Short catalog of common HTTP status codes' is a noun phrase, not a statement of what the tool does; there is no verb indicating an operation like 'look up' or 'return'. It roughly restates the tool name and gives no clue that the input schema contains unrelated params such as city, feed, or json, so an agent cannot infer the tool's actual behavior.

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 gives no guidance on when to use this tool versus alternatives like fetch-status, domain-shape, or validate-json. There are no conditions, exclusions, or examples of appropriate calls, leaving the agent to guess whether this is a lookup, a validator, or a source of hints.

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