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

No annotations are provided, so the description carries the full burden, yet it only offers the opaque phrase 'number discarded'. It does not disclose what the tool returns, whether it mutates anything, permissions, or side effects. The phrase hints at a discard behavior but is far too cryptic to inform correct invocation.

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 short sentence with zero padding, and the conversion is front-loaded. However, its brevity comes at the cost of under-specification rather than the tight efficiency conciseness rewards.

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 with nine parameters, no output schema, and no annotations, this single cryptic clause is wholly inadequate. An agent has no basis to choose which of the nine unrelated parameters to supply or to predict the result.

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 of the nine parameters is already self-documented ('Git ref name; discarded after the shape check', etc.), giving a baseline of 3. The description adds no meaning beyond the schema and does nothing to reconcile why fields like 'city', 'zone', and 'feed' exist on a picas-to-millimeters tool.

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 restates the name's conversion (picas to millimeters) and appends the cryptic fragment 'number discarded', which neither clarifies a verb+resource nor explains how a conversion is actually performed given that no numeric input parameter exists. A reader cannot tell what the tool does with its inputs. This is close to a tautology with added confusion.

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 use this tool versus alternatives such as calc-eval or the various shape-check siblings. No exclusions, no context, no conditions are stated.

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