from_files_mixed

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 mentions 'describe mixed-type files using Gemini' which reveals the model being used, but doesn't explain limitations, error behavior, whether files must exist locally, or output characteristics beyond what the output schema reflects. Being an alias for another tool, it would have been useful to note the canonical tool name.

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 concise sentence. It's efficient with no wasted words. However, it's arguably under-specified rather than genuinely concise — the brevity comes from deferring all substance to the alias target.

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 complete parameter schema coverage, the basic contract is documented. However, for a tool that's defined purely as an alias among 15 similar sibling tools, the description fails to explain the relationship to siblings (especially its canonical twin vision_from_files_mixed and the non-vision from_files_mixed). This is a moderate gap given the tool's simplicity.

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 four parameters (paths, types, prompt, compact) are documented in the schema itself. The description adds no additional parameter meaning beyond that. The constraint that paths must match types length is noted in the schema. Baseline 3 is appropriate since the schema does the heavy lifting.

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 identifies this as an alias for vision_from_files_mixed and states it describes mixed-type files using Gemini. The purpose is understandable but relies entirely on referencing the sibling tool rather than stating its own distinct function; given the many sibling tools (from_file, from_files, vision_from_files, etc.), the description does little to distinguish this alias's behavior from alternatives.

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. The description doesn't explain when to prefer this alias over vision_from_files_mixed itself, or how this tool differs from from_files_mixed (non-vision) or vision_from_files (single-type). Naming it an 'alias' implies equivalence but gives no usage context.

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