Upload Asset to Canva

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

Annotations already declare readOnlyHint=false and openWorldHint=true, so the agent knows this performs a write and reaches outside the server. The description confirms and enriches that with the concrete API path, the creation of a new asset in the library, and the returned asset_id. It still omits meaningful operational behavior: authentication requirements, supported file types/size limits, whether the upload is asynchronous, and what happens on failure.

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?

A single front-loaded sentence that states action, target, transport and return value without filler. It is slightly dense, packing the endpoint path and return value into the same clause, but nothing is redundant.

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 two-parameter tool with full schema coverage and no output schema, the description supplies enough: what it uploads, from where, to which library, via which API, and what identifier comes back. The remaining gap is operational caveats (auth, limits, async semantics) rather than core calling information.

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%, with both imageUrl and assetName documented directly in the schema, so the baseline of 3 applies. The description adds no format, validation or defaulting detail beyond what the schema already states (public URL, default name).

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 names a specific verb and resource: uploading an image file from an external URL into the personal/business asset library on Canva. It even cites the underlying endpoint (POST /v1/asset-uploads), which leaves no ambiguity about the operation. It does not explicitly contrast itself with the sibling tools, but none of them is an upload tool, so the distinction is effectively implicit.

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?

Usage is implied rather than stated: 'từ URL ngoài' (from an external URL) conveys that the source must be a reachable external URL, and the asset-library destination signals when this tool applies. There is no explicit when-to-use/when-not guidance, no mention of alternatives, and no stated prerequisites such as public accessibility of the URL or required scopes.

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