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

Annotations already declare readOnlyHint=true, openWorldHint=false and destructiveHint=false, so the safety profile is covered; 'This tool only reads the Index' restates it but usefully scopes it to the Index. The description does not explain how recommendations are ranked or filtered (fuzzy match? scoring?) — context an agent would need to trust results.

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 core action and return shape. Slight redundancy in the trailing 'only reads the Index' sentence given the readOnlyHint annotation, but no filler.

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?

Output schema exists and schema coverage is full, so return values and parameters are documented. What is missing is the differentiator: why an agent should pick this over search_records, and whether results are ranked — a meaningful gap for a tool whose name implies ranking.

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%, including enum values for status and default/max for limit, so the schema already carries parameter meaning. The description adds nothing beyond 'for a need', which is the baseline-3 case.

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 ('Return') and resource ('public MCP servers from the full Index') plus the shape of each match (slug and tool names). However, it never distinguishes itself from the sibling search_records, which an agent could reasonably read as doing the same thing.

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 statement of when to use recommend_records rather than search_records, get_record, or compare_records. The only sibling reference appears inside the host parameter description ('same as search_records'), which clarifies a field, not tool selection.

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