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

No annotations exist, so the description carries the full burden. It does add one genuinely behavioral fact not available elsewhere — the cost of 1 credit per call — and 'inspect' implies a non-mutating read. It says nothing about network behavior, timeouts, or what happens with an invalid/unreachable certificate, which is a real gap for a zero-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 compact sentences, capability first and cost last. Every clause earns its place; nothing is padded or restated from the 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?

For a simple single-parameter read tool with no output schema, the description usefully enumerates the returned fields, which is the main thing an agent would otherwise lack. The missing piece is input format guidance for the domain parameter.

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% for the single parameter, so the description must compensate and largely does not. It implies a site/domain input but gives no guidance on format — no statement about whether a scheme, path, or subdomain is accepted, despite the schema's strict lowercase pattern and length bounds.

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?

States a specific verb (inspect) and resource (HTTPS certificate) and enumerates exactly what is reported: issuer, validity dates, days until expiry, alternate names. That field list distinguishes it from nearby siblings like security_headers or domain_info, though no sibling is named explicitly.

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, no prerequisites, and no alternatives named. The agent must infer that this tool is for certificate inspection rather than, say, site_audit or security_headers, purely from the resource noun.

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