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

With no annotations, the description carries the full burden and does well: it discloses the stop-word filtering of generic terms, the default sort (newest), and a non-obvious fallback that returns near-matches with exact_match false plus a note. It does not mention any auth, rate limits, or paging beyond limit, but for a read-only search these are minor.

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?

Four short sentences, front-loaded with the verb and scope, then filters, then return shape, then edge-case behavior. Nothing is redundant and no sentence could be removed without losing information.

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 five-optional-parameter read search with no output schema, the description covers purpose, filter combinatorics, the returned fields, and the no-match fallback including the exact_match flag. That is everything an agent needs to call it and interpret results correctly.

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 the enum and a cross-reference to list_categories for category slugs, so the schema already does the heavy lifting. The description adds only the combining/optional semantics and the query-cleaning rule, which is useful but marginal beyond the schema baseline.

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?

The description opens with a specific verb+resource: "Search verified indie projects in UluP Nexus," which tells an agent exactly what domain is being queried. It does not name or contrast with the sibling list_categories (that reference only appears in the schema), so differentiation from the sibling 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?

It clearly states that all filters are optional and combinable, and gives concrete behavior for the degenerate case: generic words like "indie" or "app" are ignored, and with no keywords it lists the newest projects. What's missing is guidance on when to prefer this tool over list_categories (e.g., browse mode vs. discovery).

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