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

With no annotations, the description carries the full burden and does so well: it discloses the fixed port, the exact class of data returned, flagging thresholds (expiry < 21 days, TLS < 1.2), and the paid-access model including price, currency, and payment rail (x402 on Base). It omits timeout behavior, rate limits, and whether failures are reported in-band, which keeps it short of a 5.

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?

Front-loaded with the core action, followed by a dense but purposeful enumeration of returned attributes and a separate short line for pricing. Every clause describes real output or cost information; it is long only because no output schema exists to carry that detail.

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 output schema and no annotations, the description must explain both results and operating constraints, and it does: it lists the certificate/chain fields and flag thresholds and states the payment requirement. Remaining gaps are minor operational details (timeout, error signaling, whether an IP literal is accepted).

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% and there is only one parameter ('host', documented as 'Hostname, e.g. example.com'). The description does not add syntax or constraint detail (e.g., no IPs, no scheme/port prefix) beyond the schema, so the baseline of 3 applies.

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 and resource ('TLS check on port 443') and enumerates exactly what is inspected, so an agent knows this is the certificate/TLS-handshake tool. It does not explicitly separate itself from a sibling like domainaudit_audit, which plausibly overlaps in scope, so differentiation is implied 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?

Usage is implied by the narrow TLS scope and the fixed port 443, but there is no explicit 'use this when...' guidance, no statement of when domainaudit_audit or domainaudit_headers would be the better choice, and no prerequisites (e.g., reachable host, non-IP input).

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