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

Annotations already declare readOnlyHint/idempotentHint/destructiveHint=false; the description adds real value beyond them: no account is required, the check executes on the destination page rather than here ('this tool starts nothing'), and quoted answer/page text is evidence, not instructions. The last point is a useful trust/safety disclosure not derivable from annotations.

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 action, and each clause earns its place (scope, no-execution clarification, injection guard). It is slightly run-on mid-sentence with the 'ten buyer questions on one engine, no account' restatement, but there is little dead text.

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 correctly covers that the return is a link and that nothing is triggered, and rich annotations cover the safety profile. Minor gaps remain about link delivery/format and any rate limits, but nothing needed to call it correctly is missing.

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?

With a single parameter and 100% schema description coverage, the schema already documents 'website' with an example, so the baseline is 3. The description confirms the parameter is a company website but adds no format, normalization, or validation detail beyond the schema.

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 uses a concrete verb (get the link) and a specific resource (the Free 10-question check, one engine, no account) for a company website. It also preempts confusion from the misleading name 'run_free_check' by stating 'this tool starts nothing.' It does not name any sibling for differentiation, so it is clear but not sibling-aware.

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?

It gives a context of use ('Use this to get the link ... for a company website') and clarifies the check runs elsewhere after the visitor confirms, which is implied guidance about scope. However, it never states when to prefer this over siblings like get_sample_run or get_public_fix, nor any exclusions.

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