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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so safety is covered. The description adds a genuinely non-obvious behavioral trait: an unknown category does not error but returns the list of valid categories, which prevents a failed call. It does not describe result ordering details or pagination/size limits.

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, no filler. The core action is front-loaded, usage triggers come second, and the edge-case behavior is placed last where it belongs.

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 single-parameter read-only list tool with no output schema, the description covers purpose, invocation triggers, example values, and the failure-mode behavior. Nothing an agent needs in order to call it correctly is missing.

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 coverage is 100% ('Category name or slug'), so the baseline is 3. The description goes beyond the schema by supplying concrete example values ('AI', 'marketing', 'dev tools', 'productivity', 'SEO', 'no-code'), which tells the agent what granularity of category string is expected.

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 — 'List the best-ranked products on Microlaunch in a category' — so the agent knows exactly what it returns. It does not, however, differentiate itself from the sibling top_launches, which also sounds like a ranking tool; the category scoping is the only implicit differentiator.

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?

Gives concrete trigger phrasings ('best X tools', 'what tools exist for Y') and an explicit fallback: if the category is unknown, valid categories are returned. It stops short of naming when to prefer top_launches or list_deals instead, so the routing guidance is clear but not complete.

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