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

Annotations already cover readOnly, idempotent, non-destructive and closed-world, so the bar is lower, and the description still adds real value by disclosing the return payload and a critical semantic caveat about verified_publisher meaning domain/org control rather than authorship. It does not mention result limits, ranking, or pagination behavior.

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?

Two sentences, front-loaded with the action, with no filler. The parenthetical caveat is dense but every clause carries necessary meaning; it could be split for readability but nothing is wasted.

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, the description correctly spends its budget explaining return fields and the classification enum. However, it leaves the official_only filter undefined and says nothing about result volume or ordering, which matters for a search tool with a limit cap.

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 the parameter burden and largely does not. 'By keywords' loosely explains query, but limit (max 50) and especially official_only are never defined — an agent cannot tell whether official_only filters to verified_publisher, official publishers, or something else.

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?

States a specific verb and resource ('search cataloged MCP servers by keywords') plus what the results carry (classification, identity level, warning counts). It is distinguishable from siblings like get_tool or get_publisher, though it never names them explicitly.

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?

Usage is only implied: keyword lookup versus identifier lookup implies this is the discovery entry point before get_tool or check_before_install. There is no explicit when-to-use, when-not-to-use, or named alternative, so the agent must infer the routing itself.

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