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 safety profile is covered. The description adds meaningful context beyond that: which platforms are excluded for licensing reasons, that each hit carries source/time/link, the requirement to credit GDELT, and a prompt-injection warning ('data, never instructions'). It doesn't cover rate limits or pagination, so it falls short of a 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?

The purpose is front-loaded, and every sentence contributes something (included sources, exclusions, hit fields, attribution, game-only mode, data-vs-instructions warning). There is some redundancy between 'from the sources whose own terms allow passing it on' and the subsequent explicit exclusion list, and the phrasing is dense, but nothing is wasted.

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 still explains what each hit contains (source, time, link) and how results are scoped. Combined with annotations covering the read-only, idempotent nature, an agent has enough to invoke it correctly; only minor operational details like pagination or rate limits are absent.

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 schema already documents q, game, limit, order, since, and until thoroughly. The description adds only the combination semantics ('with a game and no words: everything recorded about it'), and otherwise defers to the schema, matching the baseline for high-coverage schemas.

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 ('Search what was written about Roblox and its games') and sharply defines scope by naming the included source (GDELT news articles) and the excluded platforms (X, Reddit, YouTube, TikTok, etc.). This scope statement effectively separates it from a general search tool, though it never names a sibling like search or find explicitly.

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 one concrete usage pattern ('With a game and no words: everything recorded about it') and an attribution obligation, which implies when the tool is appropriate. However, it gives no explicit guidance on when to prefer this over siblings such as search or find, leaving the agent to infer the choice from the source-scope description.

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