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

Annotations already declare readOnlyHint, openWorldHint=false, and idempotentHint, so the safety profile is covered. The description adds value beyond that by disclosing that the payload is an archived, explicitly labeled example rather than fresh data, and that it requires no payment and performs no network scan — meaningful behavioral context for an agent deciding whether the data is trustworthy.

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 short sentences, front-loaded with the positive statement of what is returned and immediately qualified by the exclusion. There is no padding or repetition of the name or title.

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 no parameters, no output schema, and full annotation coverage, the remaining burden is small: the description establishes content type and provenance. It could say a bit more about the shape of the example payload, but nothing essential for correct invocation is missing.

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 tool takes zero parameters and the schema is a closed empty object, so there is no parameter meaning to convey. The baseline of 4 applies; the description correctly implies no inputs are needed.

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 and resource ('Return an ... archived example') and immediately negates the likely wrong interpretation ('not live telemetry'), which separates it from the live-data siblings like scan_tls and get_tls_evidence. It stops short of naming a specific alternative tool, so it is clear but not fully sibling-differentiated.

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?

Saying 'not live telemetry' implies this is the fallback/static path rather than a scan, and 'no payment and no network scan' clarifies prerequisites. However, it never states the condition under which an agent should choose this over the sibling tools, leaving the when-to-use decision implicit.

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