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

Annotations already declare readOnlyHint=true and openWorldHint=false, and the description usefully adds that data is refreshed daily rather than stale training data. However, with both parameters optional it never says which key wins if both are given, nor what happens if neither is — a real behavioral ambiguity for a lookup 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?

Two tight sentences: the core action and lookup keys are front-loaded, and the freshness note follows as a single supporting clause. No restatement of the tool name, no filler.

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, read-only two-parameter lookup with annotations covering safety and no output schema, the description covers purpose, inputs, and data recency. Only the edge-case behavior (both keys present, no key present, unknown spell) is left unstated.

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 must carry the load; it does add meaning by tying spell_id to get_talents and presenting name as an alternative key. It does not clarify precedence, requiredness (both are optional per schema), or accepted name formats such as casing or partial names.

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?

Specific verb and resource ('Get ... details for a spell') plus the exact payload ('name and full effect description') and both lookup keys. It also routes the agent to get_talents as the source of spell ids, which distinguishes it from that sibling without opening either schema.

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 states the two ways to call it (by id sourced from get_talents, or by name) and reassures the agent that results track the live patch. It stops short of saying what happens when both keys are supplied or when a lookup fails, so there are no explicit exclusions.

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