vision_from_resources_mixed

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

No annotations are provided, so the description carries the behavioral burden. It discloses that resources are compared in 'one Gemini session', which reveals a key behavioral trait (shared session context). However, it doesn't disclose constraints like URL accessibility requirements, rate limits, or what happens on mixed-type failures. The 'one Gemini session' detail provides modest value but is incompletely developed.

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 a single efficient sentence that captures verb, scope, and mixed-type nature without waste. It's front-loaded with the core action. It could arguably add a bit more differentiation context, but as-is it's appropriately sized for its content.

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?

An output schema exists, removing the need to document return values. With 100% schema coverage and a clear description, the tool is reasonably specified. However, for a multi-resource tool with mixed types (text/image/audio/video), there's no guidance on resource count limits, size constraints, or whether separate prompts-per-type are needed. Given the complexity of mixed-type processing, some additional context would strengthen completeness.

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 100%, so the input schema already documents all parameters, including the types-accepted list and the length-matching requirement between types and resources. The description adds the conceptual framing of 'mixed types' and 'one Gemini session', which enriches understanding of the types and resources semantics beyond the raw schema. This meets the high-coverage baseline and adds some value.

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 'Describe multiple URL resources of mixed types in one Gemini session' clearly states the verb (describe), resource (multiple URL resources), and scoping ('mixed types', 'in one Gemini session'). It distinguishes from singletons like vision_from_resource and from non-mixed variants like vision_from_resources. However, it doesn't explicitly name the distinguishing sibling, which keeps it from a 5.

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 use when handling multiple URL resources of mixed types, which differentiates from same-type variants and singletons. However, there's no explicit 'when to use this vs alternatives' guidance, no exclusions, and no mention of constraints like URL accessibility. It relies on the reader to infer usage from sibling names.

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