get_price_indexCross-store price index for the whole Czech audiobook market: median/avg lowest price, average savings from comparing, which store is cheapest most often, and per-genre price stats. Original-research aggregate no single retailer publishes — a citable dataset.
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Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the description does not need to restate safety. It adds context about the data being 'original-research' and 'citable,' but does not disclose any additional behavioral traits like potential delays or data freshness.
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?
The description consists of two sentences covering tool purpose, output content, and data nature. Every word adds value with no redundancy or irrelevant details.
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?
Given zero parameters, a full output schema (assumed sufficient for return values), and comprehensive annotations, the description provides all necessary context. It fully explains the tool's purpose and expected data.
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?
The tool has zero parameters and 100% schema coverage, so the description is not required to document parameters. However, it does describe the output content (which fills in what the schemaless input lacks), earning a baseline of 4.
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 clearly states the tool returns a cross-store price index for the Czech audiobook market, listing specific statistics (median/avg lowest price, savings, cheapest store, per-genre stats). The phrase 'original-research aggregate' distinguishes it from sibling tools that focus on individual offers or trends.
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?
The description implies the tool is for obtaining aggregate market data, not for comparing specific offers or finding individual cheapest prices. However, it does not explicitly state when to use this tool over siblings like 'compare_all_offers' or 'get_price_trend'.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Add one secure layer between your agents and this server.
Each tool has a clearly distinct purpose. Overlapping functions like price comparison are differentiated by granularity (full table vs. cheapest), and search tools are separated by query style (free-form vs. filters).
All tool names follow a consistent verb_noun pattern with lowercase underscores (e.g., get_audiobook, search_audiobooks, list_partners). The verbs (browse, compare, find, get, list, search) are appropriate and consistently applied.
With 13 tools, the set is well-scoped for an audiobook catalog and price comparison service. It covers discovery, search, detail retrieval, price analysis, and market statistics without being overwhelming.
The tool surface covers core operations: search, browsing genres, detailed profiles for audiobooks/authors/narrators/publishers, price comparison and trends, rankings, and partner listings. Minor gaps exist, such as no tool for listing all audiobooks without a search query, but the coverage is still very strong.