Fetch Vanity Fair top stories to get titles, URLs, summaries, authors, publication times, and lead images without parameters.
Get Vanity Fair top stories. Returns the latest Vanity Fair top stories and takes no parameters. Each item has its title, canonical URL, summary, author, publication time and lead image.
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Changes observed during successful MCP inspections.
v1.17.5Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It usefully discloses that it takes no parameters and that results are 'latest,' and it enumerates the returned fields, which is valuable given no output schema. It stops short of stating read-only safety, freshness window, or result count.
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?
Short and front-loaded with the core action first. There is minor redundancy between 'Get Vanity Fair top stories' and 'Returns the latest Vanity Fair top stories,' but overall it is efficient.
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 parameterless read-only feed the description covers invocation and return fields, but the lack of any differentiation from vanityfair_headlines/vanityfair_article leaves a real selection gap given this crowded sibling set.
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?
Zero parameters, so the baseline is 4. The description explicitly confirms 'takes no parameters,' removing any ambiguity for the agent about invocation.
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 ('Get Vanity Fair top stories') and clarifies the scope is the site's top stories. However it does not distinguish itself from close siblings like vanityfair_headlines or vanityfair_article, leaving the agent to guess which endpoint is appropriate.
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?
No when-to-use guidance, no exclusions, and no alternatives named despite several sibling tools (vanityfair_headlines, vanityfair_article, vanityfair_sections) that overlap. The agent gets no signal for choosing this over them.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.