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 disclose one useful trait – the file is 'discarded' (no retention/side effects) – but it says nothing about output format, error behavior, or why nine unrelated inputs are accepted.

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?

It is a single terse fragment with no padding, so it is concise, but the brevity comes at the cost of being under-specified for a nine-parameter tool rather than genuinely efficient.

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 tool exposing nine parameters, no required fields, no output schema, and no annotations, one clause cannot convey the input contract or return semantics. It omits any explanation of how the parameters map to the described OBJ operation.

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 each parameter is already self-documented in the schema. The description adds no parameter meaning whatsoever, which is the expected baseline of 3 when the schema does the lifting.

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 verb and resource ('Wavefront OBJ vertex count') which is a concrete operation, but it is completely disconnected from the nine provided parameters (ref, url, city, feed, host, json, path, zone, query), none of which relate to an OBJ file. This makes the stated purpose hard to trust when reconciling with the actual input contract.

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 guidance on when to choose this tool versus its many sibling shape-checkers (file-path-ok, validate-json, memory-key-count, etc.). No prerequisites, exclusions, or alternatives are named.

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