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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered by structured data. The description adds the matching semantics of the query, which is closer to parameter behavior than to operation-level transparency, and it says nothing about permissions, result limits, or ordering.

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?

A single sentence that front-loads the verb and resource before the optional filters, with no filler or redundancy. Every clause carries information.

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 low-complexity, zero-required-parameter read-only list tool whose annotations cover the safety profile, the description is nearly complete. The only gap is the absence of any hint about return shape or result limits, which matters slightly more because there is no output schema.

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 coverage is 100%, so the baseline is 3, but the description goes beyond the schema's bare 'Free-text filter' by specifying that the query is matched against name, description, tags and frameworks. That is genuinely useful semantics an agent cannot get from the schema alone; the family filter itself is only restated from the enum.

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 gives a specific verb and resource ('List available defensive security skills') plus the optional filtering dimension, so an agent immediately knows what the tool returns. It does not explicitly name or contrast with get_skill, so the sibling differentiation is left implicit rather than stated.

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 word 'optionally filtered' implies when the filters apply, and the plural 'skills' implies this is the enumeration tool versus the singular get_skill. However, there is no explicit when-to-use/when-not guidance or named alternative, so usage is inferred rather than stated.

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