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

With no annotations, the description discloses only that values are discarded; it does not mention side effects, errors, return format, or the fact that most parameters appear to be ignored.

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 very short and free of fluff, stating the operation in two direct sentences.

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?

There is no output schema, no required input, no example, and no explanation of how to supply the JSON object or interpret the count, so the definition is incomplete for reliable 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?

The parameter descriptions are generic and mostly unrelated to the stated purpose; no parameter is clearly defined as the JSON object whose keys should be counted, and descriptions such as 'discarded after the check' actively confuse invocation.

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 core action 'Count keys in a JSON object' is clear, but the tool name suggests 'memory' and the parameter list does not identify which input is the JSON object, making the intended purpose ambiguous in context.

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?

No guidance is given about when to use this tool versus siblings such as validate-json or search-query-len, nor any conditions or exclusions.

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