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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false, and openWorldHint=false, so the safety profile is covered structurally. The description adds real value by disclosing the return contract (a public URL) even though no output schema exists, which is beyond what annotations provide. It omits size limits, accepted image formats, whether a data-URI prefix is expected, and whether repeated uploads duplicate storage objects.

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?

Three short sentences with the action and return value front-loaded; nothing is padded. The trailing "Params: image_base64, filename?" list is low-value restatement of the schema but costs little.

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?

For a simple two-parameter upload tool the definition covers the core action and the return value, which is important since there is no output schema. It leaves notable gaps around input encoding format, size limits, and the effect of filename, which an agent needs to call it correctly on the first try.

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%, so the description carries the full burden for the two parameters, yet it only restates their names ("Params: image_base64, filename?"). It never states that image_base64 must be raw base64 versus a data URI, whether size or format limits apply, or how filename influences the returned URL. It adds essentially no meaning beyond the 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?

The description gives a specific verb and resource ("Upload a local image to Kreavo storage") plus the key outcome ("Returns a public URL"), which clearly separates it from all sibling tools that generate, edit, or list assets. It stops short of explicitly naming those siblings or stating the role of this tool as a prerequisite for image-to-image workflows.

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?

There is no when-to-use guidance, no prerequisites, and no mention of alternatives such as kreavo_generate_image or kreavo_image_edit. An agent must infer on its own that this is the way to feed a local file into the generation pipeline.

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