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

With no annotations, the description carries the full behavioral burden, but it only says the value is discarded. It does not disclose whether the tool makes network calls for url/feed/host/city, whether it accesses disk, or what side effects exist.

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 six-word fragment is drastically underspecified for a nine-parameter tool, so its brevity is a defect rather than efficiency. It lacks a front-loaded verb or structural context that would help an agent parse it.

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?

No annotations, no output schema, nine optional parameters, and a description that explains neither the overall tool behavior nor why the schema spans unrelated shape-check inputs. Even with rich schema descriptions, the definition is incomplete for selection and invocation.

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%, so the schema already documents all nine parameters and the baseline is 3. The description adds no parameter meaning and mentions a UUID concept that does not correspond to any actual parameter in the schema.

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 names UUID and an output format ('no-hyphen lowercase') plus a discard behavior, but never states a verb for what the tool actually does. It also ignores the nine unrelated schema parameters (url, city, feed, host, json, path, zone, query), leaving the tool's true purpose ambiguous.

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?

There is no when-to-use guidance, no prerequisites, and no mention of alternatives among siblings like domain-shape, github-repo-shape, validate-json, or search-query-len. The agent is given no routing information.

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