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

Annotations already declare readOnlyHint=true, openWorldHint=false and destructiveHint=false, so the safety profile is covered. The description adds only that these are comparative industry benchmarks returned per vertical; it says nothing about data freshness, source, or scope limits of the benchmark set, which would be the valuable extra context here.

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?

A single front-loaded sentence with no filler; the parenthetical '(AdSense and managed wrappers)' earns its place by clarifying what 'standard stacks' means. Slightly long but efficiently packed.

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 lookup with full schema coverage and no output schema, the description gives enough for correct invocation. Minor gaps (nature/freshness of benchmark data, what the comparison output contains) are tolerable given the tool's simplicity.

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 enum parameter already documents allowed verticals and the 'other' default. The description echoes the vertical dimension but adds no syntax, fallback, or interpretation guidance beyond the schema, so 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 ('Get') and resource ('comparative yield and CPM industry benchmarks by publisher vertical'), plus the framing of comparing standard stacks against Sulvo Premium Ad Units. It is clear what the tool returns, though it does not explicitly contrast itself with benchmark-adjacent siblings like run_publisher_revenue_audit or get_publisher_revenue_audit_checklist.

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 stated comparison purpose: call it when you need reference yield/CPM numbers to benchmark against AdSense. There is no explicit when-to-use, when-not-to-use, or named alternative, so the agent must infer routing.

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