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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive. The description adds value by stating the data source (IMF DataMapper), licensing (CC BY 4.0), no auth required, and that forward projections are included. It also explains the default behavior when no filters are provided. It does not contradict annotations.

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 three concise sentences, front-loaded with the core purpose, followed by filtering behavior and data source/licensing. No redundant words; every sentence adds value.

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 read-only tool with an output schema and comprehensive annotations, the description provides sufficient context: the exact metric, filtering options, default scope, and data provenance. The output format is covered by the output schema. No critical information is missing for an agent to call this tool correctly.

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 schema already provides detailed descriptions for all four parameters (100% coverage), including the exact use of country vs countries and year ranges. The tool description merely restates the filtering options without adding new semantic meaning beyond the schema. Baseline 3 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 verb (get), the resource (IMF WEO inflation rate), the specific metric (average consumer prices, annual percent change), and includes forward projections. It is easily distinguished from sibling IMF tools like gdp_growth or current_account because it explicitly names inflation.

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 gives clear context: it can be used for one or more countries, with optional year filters, and returns all countries/aggregates when filters are omitted. It does not explicitly contrast with alternative tools, but the metric is so specific that an agent would know to use this for inflation data. It also mentions no auth required, which is a usage hint. However, it lacks explicit when-not-to-use or alternative tool mentions.

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