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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description adds useful return-value context ("Returns each article's source and title"), but says nothing about result limits, ranking, or whether a second call is needed to actually read or send an article.

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 short sentences, front-loaded with the action and the sources, with no filler. The brevity is appropriate, though the space saved is not redirected to the missing parameter or workflow detail.

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 two-parameter read-only search with no output schema, the description does the minimum: it explains what comes back at a high level. It omits how a returned article is then consumed (e.g., passed to send_encyclopedia_articles or send_to_my_device), which is the key unknown for an agent operating in this reading workflow.

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 0%, so the description carries the full burden for two parameters and largely does not. It implies the default searches both encyclopedias, which loosely maps to the source enum, but it gives no guidance on query syntax, expected input form, or when to restrict to a single source.

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 names a specific verb ("Search") and specific resources (Wikipedia and the 1911 Encyclopædia Britannica), and states the intended outcome ("articles to read on an e-reader"). It does not, however, distinguish itself from siblings like search_library, search_museum, or todays_wikipedia, so an agent must infer which search surface to pick.

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?

Usage is only implied: the phrase "articles to read on an e-reader" hints at a search-then-send workflow, but the description never states when to choose this over the other search tools or what the prerequisites are. There are no explicit when-not conditions or named alternatives.

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