upload_image

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

With no annotations, the description carries the full behavioral burden and does substantial work: it discloses in-memory file reading, base64 encoding, JSON string body format, derived filename query parameter, and uncertainty about the server's actual expected body. It omits auth, error handling, and size limits, but is unusually transparent for a no-annotation tool.

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 purpose is front-loaded, but the description is bloated with speculative OpenAPI and Spring Boot implementation details. The final paragraph about an uncertain serialization artefact is lengthy and may confuse an agent more than it helps; a shorter description would be more effective.

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?

An output schema exists, so return values need not be explained, and the description covers the upload's unusual body handling and the one required input. It still lacks auth requirements and error behavior, but is largely complete for a one-parameter upload tool with no annotations.

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% for the single file_path parameter, so the schema already documents its meaning and acceptable forms. The description adds behavioral context about filename derivation but does not deepen the semantics of file_path itself, so the baseline of 3 is appropriate.

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 first sentence states a clear verb and resource: 'Upload an image to the API.' It is specific enough for an agent to understand the operation, but it does not distinguish this tool from sibling upload tools such as upload_submission_attachment or upload_codebook.

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 gives no explicit guidance about when to use this tool versus alternatives. It implies usage for image uploads but never names conditions, exclusions, or sibling tools, leaving the agent to infer routing.

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