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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false, so the safety and network-reach profile is covered structurally. The description adds little beyond that: it does not say which sources are parsed, whether results are cached, how long a scrape takes, or what happens on a failing feed, all of which matter for an open-world network tool.

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?

A single front-loaded sentence with no padding beyond the mildly redundant 'for MCP server' qualifier. It is not verbose, but its brevity reflects under-specification rather than tight editing.

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 parameters and no output schema, the description carries the entire burden of explaining what comes back, and it fails to do so. For an open-world scraping tool an agent needs to know the shape and reliability of results before calling it, and none of that is present.

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?

The input schema declares zero parameters, so per the baseline for parameterless tools this sits at 4. The description does not need to explain parameter meaning, though the absence of any source/URL argument is surprising enough that a sentence clarifying the fixed-source behavior would have helped.

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 names a concrete mechanism ('parses RSS feeds and scrapes websites'), so the agent knows roughly what domain the tool operates in. However, the opening clause 'A news aggregator module for MCP server' largely restates the tool name and title, and the definition never says what it actually produces (a list of articles? a single feed?) or how a caller invokes it with no inputs.

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?

There is no when-to-use or when-not-to-use guidance, no mention of alternatives, and no stated preconditions (network access, source selection). The agent must infer usage entirely from the name and the mechanism sentence.

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