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

No annotations are provided, so the description carries the full burden. It clearly states the core behavior: navigating forward in history. However, it does not disclose edge-case behavior such as what happens when there is no forward history entry, whether it returns a result, or whether it changes the current page state beyond navigation. This is a minimal but not deeply transparent description.

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?

Two sentences, front-loaded with the core action and scope, followed by a clear exclusion. There is no redundant wording or filler. Every sentence contributes either the action, the context, or routing guidance.

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 low-complexity action with one parameter, no output schema, and no annotations, the description is complete enough. It tells the agent what the tool does, the environment it operates in, when not to use it, and which alternative to use. The parameter is already fully documented in the schema, so nothing essential is missing.

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 input schema has 100% coverage for the single parameter and already describes pageId as 'Page ID from web_navigate'. The description merely references pageId without adding new semantic detail, so the baseline score of 3 applies. No additional parameter meaning is needed for this simple one-parameter tool.

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 action ('Go forward one history entry'), a specific target ('the DESKTOP grid browser'), and the required handle ('by pageId'). It clearly differentiates itself from the sibling webpage_forward by explicitly stating it is not for phone/tablet devices. An agent can understand exactly what this tool does and how it differs from nearby tools.

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 when not to use this tool ('Not a device') and provides the alternative for the excluded case ('for a phone or tablet use webpage_forward'). This gives clear usage routing without requiring the agent to inspect other tool definitions. The implied use case, desktop grid browser navigation, is also clear from the first sentence.

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