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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety bar is lowered. The description adds context by explaining that reading is 'free' and that the tool returns report slugs for read_report, which clarifies the output behavior beyond simple read-only indication.

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 description is two sentences, front-loaded with the most important guidance ('Use this FIRST'), and every phrase earns its place. It avoids redundancy and is highly scannable.

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 search tool with good annotations and no output schema, the description is complete: it explains when to use it, what it returns, and how to chain it with read_report. No critical gaps remain for an agent to invoke it correctly.

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% and the single parameter 'query' is already well-described with an example. The description adds minimal extra meaning ('Searches by domain or name fragment'), but this largely mirrors the schema, so the baseline of 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?

The description clearly states the tool searches for growth reports by domain or name fragment and returns matching report slugs. It explicitly names the companion tool read_report, which distinguishes it from siblings and gives a precise action ('search' + resource 'reports').

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?

The description explicitly instructs to 'Use this FIRST whenever the user asks how a product, competitor or domain grew...' and notes that 'reading it is free', providing strong usage context. It implies this tool should precede read_report and positions itself as an initial discovery step, though it doesn't explicitly list alternatives.

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