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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds genuine value by revealing fuzzy/multilingual matching tolerance, but says nothing about result ordering, relevance ranking, or whether multiple matches are returned.

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, no filler, with the capability statement front-loaded and the selection trigger immediately after. Nothing restates the name or title.

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 3-parameter read-only search tool with a fully documented schema and no output schema, the description gives enough to invoke it correctly. Minor gaps are the absence of result-count/ranking expectations and no sibling routing guidance.

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%, with per-parameter examples for query, defaults and bounds for limit, and an enum for locale — so the baseline is 3. The description echoes the query dimensions (symbol, atomic number, name) and 'any supported language' hints at locale, but adds no syntax beyond the schema.

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 (find/search) and resource (elements) plus the exact query dimensions: symbol, atomic number, full or partial name. It does not name siblings like get_element or list_elements, so the distinction is inferable but not explicit.

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?

'Use it when a name is misspelled, partial or in another language' gives a concrete trigger condition for selection. It stops short of stating when not to use it (e.g. exact lookup should go to get_element) or naming alternatives, so it misses the top band.

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