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 genuine behavioral context beyond that: newest-first ordering, the trailing-48h coverage ceiling, and the fact that the source is a public sitemap rather than a gated feed.

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?

Three tight sentences, front-loaded with the source and scope, then the returned fields, then the coverage/exclusion caveats. Every clause carries information and none is redundant.

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 present, the description usefully enumerates the returned fields (headline, published time, keyword tags, geo location) and ordering. Combined with the coverage window and exclusions, an agent has everything needed to call it correctly without parameters.

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?

Coverage 100%, baseline 3; description adds no syntax beyond the schema.

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 (latest press releases from EIN Presswire) plus the exact source (public news sitemap), which cleanly separates it from einpresswire_search_releases and einpresswire_get_release. It also explicitly negates two adjacent things it is not: the full archive and the gated RSS feeds.

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 ~48-hour window, 'every category' coverage, and the explicit 'not a full archive' exclusion give clear conditions for using this over an archive/search tool. It stops short of naming the alternative sibling (einpresswire_search_releases) outright, so the routing is implied rather than stated.

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