vision_from_resources

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

No annotations are provided, so the description carries full burden. It reveals this fetches multiple URLs in a single 'Gemini session,' which hints at batching behavior. But it doesn't disclose what happens on mixed media types, rate limits, size constraints, or failure behavior for individual URLs. Given zero annotation coverage, this is a notable gap for a tool that fetches external resources.

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 single-sentence description is efficient with no wasted words, but it's under-specified. It echoes what the name already conveys ('vision_from_resources') with little additional elaboration on the session behavior beyond the one gem. Short is good, but this crosses from concise to thin.

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 an output schema present and 100% parameter coverage, much of the needed structure is in place. However, with many sibling tools (from_file, from_files, mixed variants, new_vision), the description doesn't explain the distinguishing session model or the mixed-media advantage. Given the complexity of this tool family, more context on when this specific one applies would help.

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 all 4 parameters are documented in the schema itself (type as enum, prompt as instructions, compact, resources as URL list). The description adds minimal value beyond the schema — it only signals session batching. Baseline 3 is appropriate since the schema carries the semantic weight.

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 says 'Describe multiple URL resources in one Gemini session,' which states a verb+resource (describe multiple URL resources) and distinguishes from vision_from_file (single file) and vision_from_resource (single resource) via the plural 'resources.' However, it's terse and doesn't fully capture what 'describe' means — extract, summarize, analyze? Though the name and plural form differentiate from siblings, the verb 'describe' is somewhat generic.

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 is provided. The plural 'resources' implies it's for multiple URLs vs. vision_from_resource for a single one, but this is only implicit in the name, not stated in the description. No exclusions, alternatives, or context about when this tool is the right choice versus vision_from_files_mixed or vision_from_resources_mixed.

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