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

Annotations already declare readOnlyHint, idempotentHint and openWorldHint, so the safety profile is covered. The description adds that the report covers 'every launch risk flag we publish' and that results include daily drift, and it discloses that the tool is free — a mildly useful behavioral fact for a paid-data service. No contradiction with annotations, but no detail on latency, data freshness or rate limits either.

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 word 'Free' is stated twice (opening token and trailing 'Price: free.'), which is pure redundancy, and the description opens with pricing rather than the tool's function. One sentence of substance is padded with duplicated billing information.

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, the description carries the return-value burden and does so reasonably well, enumerating the metrics returned (24h collapse rate, base rate, sample size, window, drift). For a single optional integer parameter tool it is nearly sufficient, missing only data freshness or coverage caveats.

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 100%: the single 'days' parameter is fully documented including the 1/7/30/90 rounding and 1-90 bounds. The description touches the same concept ('test window') without adding syntax or defaults, so the schema does the heavy lifting. Baseline 3 applies when coverage is high.

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 states concretely what data is returned: for each published launch risk flag, the collapse rate within 24h versus the base rate across all launches, plus sample size, test window and daily drift. That is clear enough for an agent to know this is a read-only flag-accuracy report. It never differentiates itself from siblings like service_stats, pool_health or market_snapshot, so it stops short of a 5.

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 mention of any alternative tool. The only context is pricing ('Free', 'Price: free.'), which does not help an agent decide between this and the other ten sibling tools. Usage is left entirely to inference.

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