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

Restates that it is free and adds behavior the annotations cannot express: no x402 challenge, no payment required, honest servable:false / gkg_snapshot_absent reporting until ingest loads, and no GKG field data leaked. The HTTP equivalent endpoint is also given, which is real operational context.

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-loads what it is and what it returns before the caveats, which is the right order. Slight redundancy between 'FREE preflight' and 'no payment required: call directly without payment' costs it a point but no sentence is filler.

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 does the necessary work of naming every returned field and the failure state, and the readOnly/idempotent annotations cover safety. The remaining gap is the input side: four parameters, one required, are left entirely unexplained.

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 0%, so the description carries full burden for q, days, lang, and limit — yet it never mentions any of them. 'articles_in_window' hints obliquely at a time window but gives no format, defaults, or meaning for the four actual inputs.

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 ('FREE preflight for the held gdelt enriched search') and enumerates exactly what is returned (articles_in_window, gkg_snapshot_present, gkg_snapshot_as_of, gkg_coverage_pct, servable/reason_class). Explicitly says 'No GKG field values are returned,' which cleanly separates it from the enriched operation it fronts.

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?

Makes the routing decision clear: call directly, no payment, and the underlying enriched op is held and unpurchasable, so this is the only callable surface. It does not name other preflight siblings (e.g. gdelt_news_clusters_preflight, gdelt_news_crypto_preflight) or say when those would be preferred, which keeps it short of a 5.

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