files_upload_file

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

No annotations are provided, so the description carries the full burden. It does not disclose any behavioral traits beyond the basic action, such as whether the upload overwrites existing files, how source_url is processed, authentication needs, or what the response contains. For an upload tool, this is a significant gap.

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, compact sentence that directly states the tool's purpose without any redundant or extraneous content. It is highly concise and well-structured.

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, but the description is too sparse given the lack of annotations and output schema. It does not explain expected return values, failure modes, or constraints on the two upload methods. A more complete description would cover these aspects, making this barely adequate.

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?

The input schema has 100% coverage with clear descriptions for name, content, and source_url. The description adds minimal extra meaning beyond the schema, essentially restating the content/source_url option. It earns the baseline 3 for 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 clearly states the tool's verb ('Upload'), resource ('a new file'), and distinct input methods ('base64 content or a source URL'), which distinguishes it from sibling file tools like copy, move, or delete. It fully conveys the purpose.

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 usage by explaining the core function, but it does not explicitly specify when to use this tool versus alternatives, nor does it provide context about prerequisites, file size limits, or when to prefer content vs source_url. This is implied usage rather than explicit guidance.

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