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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is covered. The description adds useful behavioral context by noting that results are 'best-matching' and describing the return fields, which helps the agent understand result ranking and content without contradicting the annotations.

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 description is a single sentence that front-loads the core action and resource, then lists the return fields efficiently. Every clause adds useful information with no redundancy or 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?

For a simple two-parameter read-only tool with a present output schema and strong annotations, the description is largely complete. The only missing context is explicit sibling differentiation guidance for cases where the agent might consider 'search' or 'fetch', but this is minor given the clear scoping to publication articles.

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%, with both query and limit already well documented in the schema. The description's 'by keyword' phrase adds little beyond the schema's 'Search keywords', so no significant new parameter meaning is provided.

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?

The description names a specific verb ('Search'), a specific resource ('this publication's articles'), and the input type ('by keyword'). It also states what is returned (titles, dates, canonical URLs, short summaries), which clearly distinguishes it from siblings like list_recent_articles and popular_content.

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 description implies the tool is for keyword-based article search, but it does not explicitly state when to use this tool over the sibling 'search' or other alternatives like list_recent_articles. The context is clear enough for basic routing but lacks explicit exclusions or alternative guidance.

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