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

Annotations already declare readOnlyHint and openWorldHint, but the description adds meaningful behavior beyond them: the single-page read scope (no crawling), the 0–100 scoring range, and the exact factors the score is composed of. It does not mention failure modes for unreachable pages or rate/robots constraints, which keeps it below 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?

The scoring verb and scale are front-loaded, followed by a compact factor list and a one-line routing hint — no filler sentences. The factor enumeration is slightly run-on and some terms ("phone screens", "share picture") are terse, but nothing is genuinely wasteful.

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 single-parameter, read-only tool with no output schema, the description carries the needed weight: it explains the score range, the factors evaluated, and the read scope. The only gap is whether the response is a single number or a per-factor breakdown, which an agent might want to know before formatting results.

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?

With one parameter and 100% schema description coverage, the schema already explains that 'url' is the website address with an example. The description's only added nuance is that this URL should be the single public page to be read, which is a modest clarification rather than new syntax or format guidance.

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 opens with a precise verb+resource pair ("Scores a real-estate office's or developer's current website") and states the output scale (0–100), then enumerates the concrete factors scored. This clearly separates it from the sibling real_estate_website_builder, which is named as the complementary action rather than a substitute.

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 gives clear operating context ("Reads only the one public page given") and explicitly names the follow-up tool with the condition for pairing it ("Pair it with real_estate_website_builder to show the owner a better site"). It stops short of explicit exclusions — e.g. what to do for login-gated sites or multi-page audits — so it is strong but not fully routable guidance.

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