upload_to_s3

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

No annotations provided, so description carries full burden. Discloses multi-service support, credential fallback, and default behavior for key. Does not mention overwrite policy, error behavior, or file size limits.

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?

Well-structured but verbose, especially the list of sample prompts which may be unnecessary for an agent. Could be more concise without losing essential information.

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?

Covers inputs, fallback behavior, and examples. Does not describe return values, but output schema exists. Lacks mention of success/failure conditions, but overall fairly complete for a file upload tool.

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 0%, but description explains each parameter, including defaults (key defaults to filename) and fallback logic for endpoint, access_key, secret_key. Adds significant value beyond bare schema.

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?

Clearly states the tool uploads a file to S3-compatible storage, lists specific services (MinIO, AWS S3, etc.), and explains credential fallback. Distinguishes from retrieval/processing sibling tools.

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?

Provides sample prompts and explains credential handling, but does not explicitly state when to use this tool vs alternatives. Context is clear but lacks direct when/when-not guidance.

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