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

The annotations already cover readOnly, openWorld, idempotent, and non-destructive, so safety is handled. The description still adds real value beyond the structured data: it discloses the ordering ('newest first') and gives a substantive data-quality warning that the category is derived from the feed document on every crawl, not from what the submitter claimed. That caution genuinely shapes how an agent should trust and report the kind field.

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 key information is front-loaded, and both sentences do real work without padding. The final attribution line ('Served by RSSAmp (https://rssamp.com/mcp)') is provenance boilerplate that does not help an agent invoke the tool, though it is short.

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 three optional parameters, full schema coverage, and rich annotations, the description covers the essentials: directory scope, ordering, category filter, and how categories are assigned. Because there is no output schema, it could say more about the shape of a feed entry, but that is a minor omission for a paginated listing tool.

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%, so the baseline is 3, because the schema already documents limit defaults, the offset floor, and the kind enum. The description repeats the enum values and adds the provenance note for kind, but it does not explain pagination semantics such as whether results run out or what a total count would be.

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?

Names a specific action and scope: 'Page through the whole directory, newest first', plus an optional narrowing by kind. That is enough to distinguish this browsing tool from single-entity siblings such as get_feed or get_author. It stops short of naming an alternative (for example, search), so sibling differentiation is implicit rather than explicit.

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?

Offers clear filter guidance ('Narrow to one category... Omit for all of them'), which tells you how to use the tool. It never states when to choose this tool over rssamplifier_search, rssamplifier_trending_topics, or the other list_* tools. The use case (browsing the catalogue) is implied by 'whole directory' but not stated as a rule.

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