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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds genuinely new behavior: the default window is 'roughly the last 6 months' when dates are omitted, and the call degrades to notConfigured: true when no Bing Webmaster API key exists for the property — a failure mode annotations do not capture.

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 purpose and scope, then a compact metric enumeration, then the notConfigured caveat. Two sentences, no filler. The metric list is long but each item is a distinct return dimension, so it earns its space.

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?

Covers target, default window, returned metrics and the missing-API-key state for a read-only, single-required-param tool. Since an output schema exists, enumerating return fields in the description is optional rather than necessary, and pagination/cardinality behavior is unaddressed — minor gaps only.

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 67%: startDate and endDate are well documented in the schema (format, examples, 'never pass null'), while siteUrl has no description at all. The description partially compensates by calling the target a 'property', but it adds no date syntax, timezone, or window semantics beyond what the schema already states. Baseline 3 is appropriate.

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 (Bing daily crawl statistics for a property) and enumerates exactly which metrics come back: pages crawled, index size, inbound links, response-code breakdown, robots.txt blocks, crawl errors and malware flags. That level of specificity lets an agent separate it from neighbors like get_bing_page_stats, get_bing_link_counts and get_bing_crawl_issues.

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 only implied: an agent can infer this is the tool for crawl/indexing health of a Bing property, and the notConfigured note signals a prerequisite. But there is no explicit when-to-use statement, no exclusion, and no routing to alternatives such as get_bing_crawl_issues for issue detail or get_bing_page_stats for traffic.

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