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

With no annotations, the description carries the behavioral burden. It clearly discloses the action, the platform scope, and the input requirement. It does not describe failure behavior such as what happens when no history exists, but for a simple navigation action the disclosure is sufficient.

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 terse sentences, each earning its place. The core action and platform scope are front-loaded, and the alternative routing is shared in a short second sentence with no redundant 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 single-parameter, simple navigation tool with no output schema, the description is complete. It covers the operation, the platform restriction, the parameter context, and the key alternative tool, leaving no essential calling information 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 already fully documents pageId with 100% coverage, including 'Page ID from web_navigate.' The description only mentions 'by pageId' without adding extra meaning, so the schema remains the primary source of parameter semantics.

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 action ('Go back one history entry'), specifies the exact resource ('DESKTOP grid browser'), and the required key ('by pageId'). It also explicitly differentiates itself from webpage_back, so an agent can immediately tell which tool to invoke.

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?

Gives explicit when-to-use context: desktop grid browser use. It also provides a clear exclusion and alternative: 'Not a device — for a phone or tablet use webpage_back.' This directly routes the agent to the correct sibling tool.

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