canva_open_editor

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

With no annotations, the description carries the full burden and does disclose an important trait: the design is driven through GUI automation (desktop_* tools) rather than an API. It also warns that crown-marked elements are Pro, a real account limitation. It omits prerequisites (e.g., whether desktop control must be initialized first), auth/ownership requirements, and what happens if the editor is already open.

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?

Purpose is front-loaded in the first sentence, and the workflow sentence is compact and scannable. The element-insertion workflow is somewhat tangential to the act of opening an editor, which keeps it from being maximally tight, but every sentence carries usable 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?

There is no output schema or annotation to lean on, so the description must stand alone for a tool whose whole point is opening a local browser session. It covers what to do after opening but leaves the critical 'how do I get design_id' and any prerequisite sequence unaddressed.

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 single parameter design_id has 0% schema description coverage, and the description never mentions it or says where to obtain a valid value (e.g., from canva_list_designs or canva_create_design). With only one parameter and no schema help, the description should have compensated and does not.

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?

States a concrete verb and resource ('Open a Canva design in the browser on this computer') and adds a distinguishing trait: it readies the session for desktop_* control, which separates it from the API-style Canva tools. It does not, however, explicitly contrast itself with the sibling 'canva_open_desktop', so the distinction is only implied.

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 supplies a step-by-step workflow (desktop_screenshot -> click Elements -> desktop_type -> desktop_drag -> verify), which implies the context in which this tool is used. But that is downstream usage of the resulting session, not guidance on when to pick this tool over canva_open_desktop or studio_open, and no preconditions are stated.

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