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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, destructiveHint=false, openWorldHint), and the description's 'Read only' merely restates that. What it does add is substantive: the exact categories of data returned (counts per destination/country, account issues such as suspensions/missing settings/website claims, product issues with severity, Google's explanation and help link). With no output schema, that disclosure is genuinely useful, though it says nothing about auth scopes, rate limits, or result size.

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?

It is a single dense sentence, but front-loaded with the core question and then a scannable enumeration of report contents; every clause maps to real output. Slightly run-on, with the 'Read only' tag tacked on redundantly after the annotations already say it.

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 read-only report with no output schema, the description effectively serves as the return-value contract by listing every category of data the agent will get. Combined with annotations covering the safety profile, an agent has what it needs to decide to call it and to interpret the result.

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% for both parameters, so the schema already explains 'account' (optional when there is one) and 'country' (two-letter code). The description echoes the dimensions ('per destination and country', 'the account's own issues') but adds no syntax, defaults, or format detail beyond the schema. 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?

The description states a specific diagnostic resource (why products are not showing in Google Shopping) and enumerates exactly what it reports: per-destination/country counts of active, pending, disapproved and expiring products, account-level issues, and product issues grouped by kind with severity. This clearly separates it from siblings like merchant_products (product listing) and merchant_accounts (account listing) without needing to name them.

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 framing question 'Why products are not showing in Google Shopping', so an agent can infer the right context. However there is no explicit when-to-use guidance, no statement of when to prefer merchant_products or merchant_accounts instead, and no prerequisites or exclusions.

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