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

With no annotations, the description must carry the behavioral burden; it does disclose that the call is 'Free', that it is key-scoped and read-only in nature, and it lists the response fields. However it omits pagination behavior, ordering, retention window for 'recent', default/limit behavior (50/500), and rate limits, leaving meaningful gaps for a no-annotation tool.

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?

Two sentences, cost information front-loaded, no filler. Every clause earns its place: cost, scope, output fields, purpose, and the CSV alternative.

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, and the description partially compensates by naming the returned fields. Still missing are result ordering, how 'recent' is bounded, pagination semantics, and an explanation of the undocumented 'limit' parameter, which an agent would need to call this correctly.

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 only 50%: 'tool' is documented in the schema but 'limit' has only default/min/max constraints and no prose. The description mentions neither the tool filter nor the limit/pagination parameter, so it does not compensate for the coverage gap.

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 concrete verb ('List') plus the resource ('this API key's recent web and dark web tool calls') and even enumerates the returned fields (time, tool, input, success). It is clearly distinguished from the similarly named sibling site_audit. It stops short of naming any competing MCP tool, so a 4 rather than a 5.

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?

It states the use case ('for compliance and record keeping') and explicitly routes the agent to a different mechanism for CSV output. It does not state when not to use this tool or any prerequisites, so it is clear context without exclusions.

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