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

With no annotations, the description must carry the behavioral load, and it does disclose key traits: results are ranked by metadata matches, zero results are possible, empty query returns everything, and private article text is never returned. It omits pagination, result limits, ordering details, and any auth or rate-limit context, which leaves meaningful gaps for an unannotated search tool.

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 what is searched, followed by return behavior and the privacy boundary. No filler, though the empty-query rule is effectively duplicated from the schema description.

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 one-optional-parameter search tool with no output schema, the description covers input style, result ranking, empty-result behavior, and the critical privacy boundary. Missing pagination or result-count expectations is a minor gap given the low complexity.

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% and the single optional query parameter is already documented in the schema as English/Chinese keywords or a question with omit-to-list behavior. The description restates that meaning without adding format, length, or matching-strategy details beyond the schema, so the baseline of 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?

The description states a specific verb and resource ("Search public bilingual catalog metadata") plus the accepted input style (keywords or natural-language questions), which is enough to distinguish it from get_purchase_instructions. It is slightly muddied by the title calling the catalog "private" while the description insists results are public metadata only.

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 gives implicit usage cues: search by keyword or question, and "An empty query lists all articles" tells the agent the no-argument behavior. It never says when not to use it or names an alternative, and the only sibling is unrelated, so guidance stops at implied.

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