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

Annotations already declare the write/non-destructive/non-idempotent profile, and the description adds two pieces of genuinely non-derived information: the auth requirement and the dedupe behavior (an existing listing is returned if the website is already listed). It does not cover moderation/review outcomes or what happens on validation rejection, so it earns a 4 rather than 5.

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, front-loaded with the core action, then the dedupe edge case, then the auth prerequisite. Nothing is padded or redundant.

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?

An output schema exists, so return values need no explanation, and the annotations plus description cover the mutation profile adequately. The clear gap is parameter documentation: an agent knows what the tool does but not what fields it must supply or what the pricingType enum values mean in context.

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 0% across 4 parameters, so the description carries the full burden and largely fails it — only the implicit link between "its website" and the url field is hinted at. There is no mention of name, description, or the 6-value pricingType enum, nor of length constraints.

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?

"Suggest a tool for the catalogue" states a specific action (submitting/suggesting) and resource (a tool listing in the catalogue), which is clearly distinguishable from read-side siblings like get_tool, search_tools, and compare_tools. It stops short of explicitly naming a contrasting sibling, so a 4 rather than a 5.

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 implies when this applies (you have a tool to propose) and adds a real prerequisite — "Requires an API key" — but gives no explicit exclusions or comparisons against alternatives such as get_tool for checking whether something already exists. The duplicate-handling sentence is behavioral, not guidance on tool selection.

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