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

With no annotations and no output schema, the description carries the full burden and does so admirably: it discloses that USD prices are FROZEN at a stated date, that each price has its own as-of date, that a live Japanese-print panel refreshes daily, and that the operation is free. It also states what is returned (names, IDs, market prices) and warns not to present USD prices as current.

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?

Front-loaded and headed, but repetitive: the frozen-USD-price warning appears in the opening NOTE and again under FRESHNESS with overlapping content ('FROZEN at 2026-09-07' vs 'FROZEN at their last good date'). The redundancy costs space without adding information.

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 search tool with no annotations and no output schema, the description covers purpose, freshness caveats, return contents, and query strategy well. Its main omissions are the semantics of the `game` and `limit` parameters, which leaves the definition slightly incomplete for correct invocation.

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 define all three parameters. It thoroughly clarifies the `query` parameter (both card and set names searchable, rarity/condition words not indexed), but never explains the `game` filter or the `limit` parameter, leaving two of three params undocumented in any field.

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 with explicit scope: 'Search 456K+ TCG products across 25+ card games.' It also distinguishes itself from siblings by describing the product_id handoff to card_forecast, grade_or_not, and simulate_price, so an agent knows this is the entry-point search rather than a pricing/forecast tool.

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?

Provides an explicit 'Use this when' clause plus a detailed search strategy (card name alone vs adding set, removing rarity/condition words, fallback when empty). It routes to alternatives after a search, but gives no explicit when-not-to-use or comparison against another lookup tool.

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