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

No annotations are provided, so the description carries the burden. It discloses that it operates on a 'DESKTOP grid browser' and performs a forward navigation, implying a mutating browser state. However, it does not mention what happens if there is no forward entry, or the exact scope of 'grid browser' (e.g., whether it's browser-specific). This is a moderate gap for a tool with no annotations.

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 description is two sentences, the first clearly states the action and scope, and the second provides an exclusion and alternative. Every word earns its place; no fluff.

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?

Given the tool's simplicity (1 param, no output schema) and the clear annotations absent, the description covers the essential purpose and usage. It does not mention edge cases like history exhaustion or error handling, but for a simple navigation action with a single parameter, this is largely sufficient. The only slight gap is not specifying whether it works only in web_navigate contexts or what happens if no forward entry exists.

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 100% and the only parameter 'pageId' is described in the schema as 'Page ID from web_navigate'. The description references 'pageId' implicitly but does not add major new meaning. However, since there is only one parameter and it is well-documented, the baseline of 3 is raised slightly because the description clarifies the context of the parameter ('for forward navigation in desktop browser'). Overall, it adds minor value 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 states a specific verb and resource: 'Go forward one history entry in the DESKTOP grid browser', and even specifies the parameter (by pageId). It clearly distinguishes from the sibling 'webpage_forward' by noting it is for phone or tablet, making the purpose unambiguous.

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 explicitly says 'Not a device', meaning it should not be used for mobile devices, and directs to 'use webpage_forward' for those. This provides clear when-to-use and when-not-to-use guidance, with an alternative named.

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