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

Annotations already declare readOnly, idempotent, openWorld, non-destructive, so the safety profile is covered. The description adds real behavioral context beyond them: score direction (LOWER = more peaceful), publisher and annual cadence, and alias tolerance. It does not mention staleness dates or response shape, keeping it below 5.

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 with the core verb+resource, then scope, then usage triggers. The long parenthetical listing indicators is informative but slightly heavy; overall every sentence contributes, with only minor tightening possible.

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 carries the return-value burden and does so adequately ('score and rank', direction of the scale, annual publication). An agent knows what comes back and how to interpret it, though it could note data currency more precisely.

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% for the single country parameter, so the baseline is 3. The description adds value beyond the schema by noting that common aliases like 'USA'/'DRC' are accepted and giving worked examples, which reduces input-formatting errors.

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 resource (Global Peace Index score and rank) and explicitly scopes it to ONE country, which distinguishes it from the sibling gpi_ranking that presumably covers many. The definition of what the score measures (societal safety, ongoing conflict, militarisation) removes any ambiguity about the resource.

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 explicit 'PREFER for' triggers with sample queries and a complementary use case alongside news data (complements gdelt). No explicit when-not or named alternative (gpi_ranking is not called out), so it stops just short of the top band.

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