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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds that this is a 'public feed' and that returns are 'headline items from the general top-story stream,' a modest scope disclosure, but says nothing about freshness, rate limits, or item counts.

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 sentences, each earning its place: the first states what it does, the rest route the agent to the correct sibling. The primary scope constraint is front-loaded before the alternatives.

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?

An output schema exists, so return values need no prose. Combined with annotations covering safety and a description covering routing to all siblings, an agent has everything needed to call this 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 tool takes zero parameters, which is the baseline-4 case. There is nothing for the description to disambiguate, and the absence of arguments is consistent with a 'top stories from the feed' no-argument call.

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 ('Fetch') and resource ('Liverpool Echo top stories from the public feed') plus the concrete return scope ('headline items from the general top-story stream'). It explicitly distinguishes itself from the section-specific sibling liverpoolecho_headlines, so an agent can route without opening any schema.

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?

Names all three relevant alternatives and the exact condition that selects each: liverpoolecho_headlines for section-specific lists, liverpoolecho_sections to discover slugs, and liverpoolecho_article when a story body is needed. This is explicit when/when-not/alternative guidance.

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