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

Annotations already cover safety (readOnlyHint=true, openWorldHint=false), yet the description adds genuinely operational facts beyond them: the data source domain, a daily refresh cadence, and an API-key requirement. It omits return shape and pagination behavior, so it is not fully transparent.

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 resource and source, then scope/freshness, then the auth prerequisite. No filler and nothing redundant with the schema.

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 and only partial parameter documentation, the description should say more about what a returned server record contains and how paging works (limit/offset). It covers source and freshness adequately but leaves the agent guessing about the response.

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 50% (q and since documented; limit and offset undocumented), and the description says nothing about any parameter, so it fails to compensate for the gap. It does not clarify filtering, date semantics, or the 1000-item limit.

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 specific resource (MCP servers from the official registry.modelcontextprotocol.io) and its scope (full current feed), which cleanly separates it from pricing/repo/trend siblings. It never states the verb explicitly (list/retrieve) but the intent is 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?

"Full current feed" implies this is the browse-everything call rather than a filtered lookup, and "Requires API key" flags a prerequisite, but no when-to-use condition, alternative, or exclusion is stated. The agent must infer usage from context.

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