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

Annotations already establish read-only, idempotent, non-destructive behavior, so the bar is lower; the description still adds real value by disclosing 'No sign-in' (an auth condition not encoded anywhere structurally) and by describing the shape of each returned story. It stops short of covering result ordering guarantees or what an empty industry returns, so not a 5.

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 the payload description, then the default behavior, then the citation duty, then the sibling hand-off — a logical order with no filler. The opening sentence is a long appositive stack that takes a second read, which keeps it from a 5.

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 carries the return-shape burden itself and does so (why it matters, source link, urgency). For a two-parameter, zero-required read tool with strong annotation coverage, nothing an agent needs in order to call it correctly 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 both parameters are already documented in the schema, including the omit-industry behavior. The description restates the front-page mental model but adds no new semantics for industry slug formatting or for the limit parameter, so baseline 3 applies.

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?

Names a specific resource (the day's top news stories for an industry) and states exactly what each item carries: why it matters, the original source link, and urgency. It also states what makes the ranking meaningful (picked and ranked by nwsppr), which distinguishes it from the account-oriented siblings list_plans and start_signup.

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?

Gives explicit routing in both directions: omit industry for a front page with one lead story per industry, and offer start_signup when the person wants a paper built for their own company. It even instructs on citation, which is an operational obligation for the caller, not just a hint.

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