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

Beyond the readOnly/openWorld annotations, the description discloses currency (USD), the universe of stores covered, and freshness ('when it was checked'), which are useful behavioral traits. It doesn't say what happens when no price is found or whether the result is a single lowest price versus a ranked list.

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 with the core output definition front-loaded and no filler; the alternatives and docs link follow in a compact second sentence. Slightly dense but every clause 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?

With no output schema, the description usefully enumerates the returned fields and cites a docs URL, and annotations carry the safety profile. The main gap is the lack of differentiation from compare_game_prices, which matters for tool selection.

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%, so the schema already documents each parameter with examples and typo handling. The description adds only that the three are alternative identification routes, which is marginal value over the structured fields; baseline 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?

States a specific verb and resource ('lowest listed price for a PC game') plus scope (stores SuperDuperBundle compares, USD) and return contents (store, checked time, comparison link). It doesn't explicitly distinguish itself from the sibling compare_game_prices, so the agent must infer that this is the single-game lookup.

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 documents the three ways to identify a game ('search by name, or pass a Steam app ID or Steam store URL'), which implies usage, but it never states when to pick this over compare_game_prices or any preconditions. Usage context is implied rather than stated.

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