desktop_open_url

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

With no annotations, the description carries the full burden. It does disclose the key behavioral trait — this has a host-side side effect, launching the OS default browser — but says nothing about whether the call blocks, whether it requires the browser to be installed/available, or how failures (no default browser, malformed URL) surface.

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?

One front-loaded sentence with the action first and the clarifying scope second; no filler.

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 one-parameter, single-side-effect tool with an output schema present, the description covers what an agent needs to decide and invoke. Only the blocking/return behavior is left implicit, which is a minor gap.

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 coverage is 0% for the single `url` parameter, so the schema adds nothing beyond its type. The description partially compensates by giving illustrative URL targets (Canva/CapCut web editors), but adds no format, scheme, or validation guidance.

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?

Specific verb+resource ("Open a URL") plus the destination context ("in the default browser on this computer"), which separates it from browser-based siblings like canva_open_editor or studio_open. It doesn't explicitly name which sibling to prefer, so it stops short of a 5.

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 parenthetical "e.g. a Canva or CapCut web editor" implies the intended scenario (launching a web editor in a local browser), but there is no explicit when-to-use versus canva_open_editor/canva_open_desktop/studio_open, and no exclusions or prerequisites.

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