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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The word 'visible' adds real information beyond the annotations: some templates exist but are not returned. It stops short of explaining pagination, ordering, or the shape of the returned list.

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?

One short sentence, front-loaded with the verb and resource, with the optional filter trailing. Nothing is wasted, though there is no structural element such as a note on the visible-scope caveat that would earn a 5.

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 two-parameter read-only list with no output schema, the description is minimally adequate. It leaves two gaps an agent would care about: the meaning of the 'custom' filter and what 'visible' excludes.

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%, so the description must carry parameter meaning. It only accounts for searchType via 'filtered by content type' and never explains the boolean 'custom' parameter, which is the more ambiguous of the two. An agent still cannot tell what custom=true selects or how it interacts with the type filter.

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 gives a specific verb and resource ('List ... templates') plus a scope qualifier ('visible'), which lets an agent distinguish it from get_template and update_template. It does not, however, contrast itself with the parallel list_* family beyond the resource name.

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?

'Optionally filtered by content type' implies the intended use case and signals the filter is optional, which is useful. There is no explicit when-to-use/when-not guidance and no reference to get_template for fetching a single template instead of listing.

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