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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so safety is covered. The description adds genuinely non-obvious behavior: results are alphabetical by name and explicitly NOT a ranking, and only public fields plus a page URL are returned. Pagination beyond the limit cap is not addressed.

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 tight sentences: purpose first, then filter/return/ordering semantics. No filler, and the most decision-relevant facts (AND combination, non-ranking order) are front-loaded.

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 full schema coverage and rich annotations, the remaining burden is small, and the description covers return shape and ordering even without an output schema. It leaves a gap around total result counts and paging for queries exceeding the 50-result 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 coverage is 100%, so per-parameter meaning is already documented, giving a baseline of 3. The description earns an extra point by stating that filters combine with AND, a cross-parameter interaction the schema does not express, and by clarifying the ordering of results relative to the limit parameter.

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 ('Search') plus a named resource ('Security Startups directory of young security companies'), which is clearly distinguishable from get_startup (single record) and list_categories (taxonomy lookup). It does not explicitly name the siblings it is not, so it stops short of a 5.

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?

The description implies a filtered-directory lookup and explains that filters combine with AND, which guides invocation. However, it never states when to use this versus list_categories (to discover slugs) or get_startup (for full detail), leaving routing to inference.

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