vision_from_files

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It does not disclose what 'one Gemini session' means operationally, whether multiple file types are accepted (the 'mixed' siblings suggest this tool only handles one type), what happens on errors, or the cost/usage implications of a session. The 'compact' parameter hints at session lifecycle but the description never mentions session management.

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 short sentence, which is economical and front-loaded. However, it is under-specified — it lacks key context that would make the tool usable, which is not a conciseness virtue but rather incomplete specification. It earns a middle score for brevity but loses points for missing substance.

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?

There is an output schema, so return values are covered elsewhere. However, given the complexity of a multi-file session tool with 4 parameters (including one enum) and nearly a dozen siblings, the description is too thin. It does not explain session semantics, type restrictions per session, or how it differs from the 'mixed' variants. A tool this complex needs more behavioral and usage context.

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 each parameter has its own description in the schema. The description adds minimal value beyond that — 'Describe multiple files' loosely maps to the paths+type+prompt parameters but adds no semantic depth. Baseline 3 is appropriate given full schema coverage.

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 files in one Gemini session' uses a verb (describe) and resource (multiple files), but is quite terse. It doesn't distinguish itself from siblings like vision_from_files_mixed, from_files, or from_files_mixed, all of which appear to process multiple files. The phrase 'one Gemini session' hints at batch processing but doesn't explain how it differs from the plural siblings.

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 or when-not-to-use guidance is provided. With seven sibling tools that appear to handle files/resources (vision_from_file, from_files, from_files_mixed, vision_from_resource, from_resources, etc.), there is no guidance on when to pick this tool over alternatives. The 'one session' wording is the only hint but lacks explanation.

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