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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered without description help. The description adds practical context ('Existing source and input limits apply', no key/credits needed) but does not augment the annotations with anything about the analysis itself.

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 purpose is front-loaded and clear, but two of five sentences are promotional/pricing boilerplate ('FREE during validation', 'No key, credits, wallet or preparation needed') that does not help an agent invoke the tool correctly, and the closing line is filler.

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?

With an output schema present, return-value explanation is not required, and annotations cover the safety profile. However, for a nested-object input with zero schema coverage the description leaves the one parameter essentially undefined, which is the remaining gap.

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 0% and the schema has a nested object with a maxLength-16000 'policy' string that is undocumented. The description's only hint, 'Supply your task in input', is generic and mildly misleading since the field is a raw CSP policy, not a task, and it says nothing about the size limit or nesting.

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 first sentence states a specific verb (parse, flag) and resource (Content Security Policy) plus the output intent (risky or missing directives), which an agent can distinguish from generic header or cookie audits. It falls short of naming the sibling it complements (security_header_audit), which would have made the boundary explicit.

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 when-to-use guidance or comparison to the adjacent security_* auditors; the only routing instruction is the generic 'Supply your task in input.' Nothing tells the agent when a CSP audit is the right choice versus security_header_audit or security_cookie_audit.

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