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

Annotations already declare readOnly, idempotent, openWorld and non-destructive, so the safety profile is covered. The description adds genuinely useful behavior beyond that: the specific files probed, the 0-100 scoring output, an Ed25519 signature, and an SVG badge. It does not mention auth needs, rate limits, or timeout behavior.

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 tight sentences: the first front-loads what is checked with concrete paths, the second lists outputs. No filler, nothing repeated from the title or schema.

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 one-parameter read-only audit tool, the description covers purpose, probed endpoints, and return shape; an output schema also exists, so return values need no elaboration. The only gap is the absence of any usage/prerequisite guidance, which is minor here given there is no competing sibling.

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 the single 'domain' parameter is fully documented in the schema with examples (kinform.net, example.org). The description adds no further parameter syntax or format detail, so the baseline 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 ('Check whether') and resource ('a web domain publishes agent-discovery files'), and enumerates the exact well-known paths probed plus the outputs returned. This is entirely distinguishable from all siblings, which are social/mission-graph tools rather than domain auditing.

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?

The purpose implies when the tool applies, but the description never states an explicit when-to-use condition, prerequisites, or any alternative to prefer. With no comparable sibling (nothing else audits domains), the omission is less costly, but no guidance is given.

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