get_member_thumbnail_url

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

No annotations are provided, so the description carries the full burden. It reveals the return is a URL string, which is helpful, but it doesn't state whether the thumbnail always exists, what happens for members without a photo, or any caching/format details. For a simple lookup tool, this is adequate but not rich.

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?

Well-structured and front-loaded with the core purpose, followed by Args and Returns sections. Slightly verbose with the explanatory phrase about 'smaller version of a member's parliamentary photograph,' but every part is relevant and there's no 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?

Given one parameter, no annotations, and an output schema (which the description doesn't need to duplicate for return value details), the description covers the essential purpose and parameter. It's complete enough to call correctly, but lacks edge-case or reliability context (e.g., missing thumbnails) that would be useful for a no-annotation tool.

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 0%, so the description must compensate. It documents the single parameter (member_id) as 'Parliament member ID to get thumbnail URL for,' which adds meaning beyond the schema's bare integer type. However, it doesn't clarify format or source of the ID, so it's baseline adequate rather than strong.

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+resource ('Get the thumbnail image URL for a member by ID') with explicit scope. The sibling get_member_portrait_url exists, and the description clarifies this returns a 'smaller version of a member's parliamentary photograph,' implicitly distinguishing thumbnail from full portrait.

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?

Provides clear context: 'Use when you need a link to a smaller version of a member's parliamentary photograph for lists or compact displays.' This gives a use case (compact displays) but does not explicitly name get_member_portrait_url as the alternative for full-resolution needs, leaving a small gap.

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