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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds the substring matching scope across specific fields, which is useful, but it does not disclose behavior such as result ordering, limit, or how 'substring' interacts with the case-insensitive q parameter.

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?

One sentence with no filler. The action ('substring search') and the searched fields are both present and immediately understandable.

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 single-parameter read-only search with an output schema and full annotation coverage, the description is largely sufficient. It could be slightly more complete by explaining what 'dek' means or by explicitly distinguishing itself from list/get siblings, but nothing critical is missing.

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 coverage is 100%, so q is already documented as a case-insensitive search string. The description adds value by specifying that q is matched as a substring across title, dek, pattern, and body, which goes beyond the schema's generic example.

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?

Description states a specific verb ('substring search') and resource with scope ('across magazine title, dek, pattern, and body'), making it clear this is a search operation rather than a list or get. The field list differentiates it from sibling tools like list_magazine_articles.

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 searching within specific magazine fields, but it does not explicitly say when to use it over get_magazine_article or list_magazine_articles. No alternatives or exclusions are named, so usage context is inferred rather than stated.

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