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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered. The description's useful addition is the return shape (titles, slugs, short descriptions), which matters since there is no output schema. It says nothing about matching behavior (accent-insensitive substring? ranking?), so it stays at adequate.

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 sentences, front-loaded with the action and scope, with no filler. The domain enumeration is slightly long but genuinely narrows the corpus, so it earns its place.

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 simple two-parameter read tool with no output schema, the description covers purpose and return fields, which is most of what is needed. It leaves the undocumented limit parameter and the exact matching/ranking semantics unexplained, and gives no pointer to get_article for retrieving a full result.

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 only 50%: query is documented in the schema, but limit has no description beyond min/max 1-20. The description adds no meaning for either parameter, so with a mid-level coverage gap the description should have compensated and does not.

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 ('Searches the Vietnamese articles published on lstuvi.com') and names the subject domain (Tử Vi, palaces, stars, lunar calendar, yearly outlooks), so an agent knows exactly what corpus is searched. It does not differentiate itself from the sibling get_article, which is the obvious complement, so it falls 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 word 'Searches' implies discovery use, and the schema note that an empty query lists newest articles hints at browsing, but the description never says when to use this versus get_article or the forecast tools. No exclusions or prerequisites are offered.

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