compare_statistics

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

No annotations are provided, so the description must disclose behavioral traits. It only states the tool compares data, without indicating whether it is read-only, requires specific permissions, or has any side effects. For an 8-parameter tool, more transparency is needed (e.g., whether data is aggregated, if results are paginated).

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 is a single sentence, which is concise but lacks structure. It is front-loaded with the core action, but the brevity may leave the agent without enough context to select or invoke the tool correctly. It earns its place but could be slightly more informative.

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 the tool has 8 parameters, two enums, no output schema, and no annotations, the description is insufficient. It does not hint at return values, error states, or usage patterns (e.g., whether regions are specified via parameters). The agent needs more context to use this tool effectively.

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%, so the baseline is 3. The description does not add additional meaning beyond the schema; it simply restates the tool's purpose. Since the schema already explains parameters adequately, this score is appropriate.

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 compares statistical data across multiple regions, time points, or items, providing a specific verb and resource. It distinguishes from siblings like search_statistics (which implies searching) and get_statistics_data (which implies retrieving raw data). However, it does not explicitly mention the comparison types (period/item) available in the 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?

No guidance on when to use this tool versus alternatives. The description does not state when-not to use it, nor does it mention any prerequisites or fallback tools. Given the sibling tools include analyze_time_series and quick_stats, comparative context is missing.

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