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

No annotations are provided, so the description carries the full burden of behavioral disclosure, and it discloses nothing about side effects, return values, or error conditions. Some behavioral hints leak only from the parameter descriptions ('discarded after the shape check', 'no disk access', 'titles discarded'), which suggest the tool performs validations, but this contradicts rather than clarifies the description's record-lookup framing. The description itself is behaviorally empty.

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 a single short sentence, structurally concise. But the brevity is under-specification, not efficiency: it omits the operation and ignores the entire parameter surface. The description is not front-loaded with actionable content because there is essentially no content.

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 9-parameter tool with no output schema and no annotations, the one-line description is severely incomplete. It does not explain how the parameters map to the claimed record lookup, what the call returns, or what valid inputs look like. An agent has no way to correctly construct or interpret a call.

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 baseline of 3 applies. Every parameter has an individual description in the schema (e.g., 'Git ref name; discarded after the shape check'). However, the tool description adds nothing on top of the schema and, critically, does not explain how any of these nine parameters relate to an ISO 3166-1 record — leaving the semantic connection entirely unexplained.

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 a specific resource ('Public ISO 3166-1 record for SD') but states no operation verb — it doesn't say whether to look up, validate, or return data. Worse, the claimed purpose conflicts with the schema: nine parameters (url, json, path, zone, query, etc.) that look like generic validation inputs bear no evident relationship to an ISO 3166-1 country record. An agent cannot determine what calling this tool actually accomplishes.

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 offers zero guidance on when to use this tool versus any of the 28 siblings, several of which are geo/location related (geo-hint, iana-zones, timezone, weather-hint) and validation related (validate-json, file-path-ok, search-query-len). There is no when-to-use, when-not-to-use, or alternative routing.

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