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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered structurally. The description's only added behavioral value is enumerating the returned fields, which is helpful for a no-output-schema tool but not rich disclosure.

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 well-formed sentence with the resource and returned fields front-loaded; the 'saaskr 한국 SaaS 디렉토리' prefix is mild branding overhead, but nothing is padded or repeated.

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?

For a read-only single-entity lookup with full annotation coverage and full schema coverage, the description is nearly sufficient, and listing the return fields compensates for the missing output schema. The only real gap is routing guidance against the many sibling tools.

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?

There is a single required parameter with 100% schema description coverage, and the schema already documents that slug comes from search_korean_saas. The description adds no format or validation detail beyond that, so the baseline 3 applies.

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 ('가져온다' / fetches) and resource (detailed info for a specific Korean SaaS), and even enumerates the fields returned (intro, category, site, status, reviews). It reads clearly as a single-item lookup, but it never names or contrasts with siblings like search_korean_saas or compare_korean_saas, so sibling differentiation is left implicit.

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: the slug parameter's schema note ('the slug returned by search_korean_saas') signals the intended chain, but the description itself never says when to use this versus search_korean_saas, find_agent_ready_korean_saas, or compare_korean_saas, nor any prerequisites.

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