view_application_thumbnail

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

No annotations exist, so the description carries full burden. It clearly states the return type (Base64 JPEG with data URI) and that it produces a low-resolution preview. It does not explicitly state it is read-only or non-destructive, but the nature of a screenshot implies no side effects. Good but could be more explicit.

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 three sentences, immediately stating the action and purpose, then providing an alternative and return format. No unnecessary words, well-structured and front-loaded.

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?

The tool is simple with no parameters and an output schema. The description fully explains what it does, when to use it, and what it returns. No gaps given complexity.

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?

With zero parameters, the schema coverage is 100%. The description adds no parameter details but clarifies the tool's purpose and output. Per guidelines, baseline for 0 params is 4, and the description provides useful context beyond the empty schema.

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 explicitly states the tool takes a small thumbnail screenshot for quick UI state checks, and distinguishes from the sibling tool 'view_application' which is for detailed inspection. The verb 'view' and resource 'application thumbnail' are clear.

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 directs users to use 'view_application' for detailed inspection, implying when not to use this tool. However, it does not elaborate on other contexts or exclusions, but provides sufficient guidance for distinguishing from the main sibling.

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