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

Annotations already declare readOnlyHint and openWorldHint, and the description goes further: it says the same audit runs on every site (uniform methodology), that results are ordered by impact, and that no cost is involved. What it doesn't cover is return format/depth or latency for auditing 4 live sites.

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?

Three short sentences: what it does, how it works, what you get back, then the cost/safety note. The core comparison is front-loaded and nothing is repeated or padded.

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 burden of describing returns, and it does: a ranking, impact-ordered gaps, and your advantages. For a one-parameter tool this is nearly complete; only the response shape details (scores, per-site breakdown) are left unspecified.

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 already documents the comma/space-separated 2-4 URL format with 'yours first'. The description only echoes the upper bound ('up to 3 competitors'), adding no new syntax or constraint information, so the 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 (compare) and resource (AI-agent readiness of your site vs competitors) and makes the multi-site scope explicit with 'up to 3 competitors'. It implicitly distinguishes itself from the single-site sibling bursia_agent_readiness, though it never names that sibling to make the split unambiguous.

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 'Compare your website with up to 3 competitors', and 'Read-only, free' signals low-risk invocation. However, there is no explicit statement of when to pick this over bursia_agent_readiness or the individual check_* tools, and no prerequisites beyond the ordering hint.

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