browser_page_url

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

The readOnlyHint annotation indicates a safe read operation, but the description adds no behavioral detail beyond that. It does not disclose what the tool returns (e.g., full URL, current tab URL), whether it requires an active page, or any side effects. The description contributes no transparency beyond the annotation.

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 extremely short, but this is under-specification rather than effective conciseness. A two-word phrase is not an appropriately sized description for a tool with optional parameters and an undocumented return value, so it fails to earn its place as a useful explanation.

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 lack of an output schema, the description should clarify what value is returned (e.g., the current page URL). It does not, leaving users to guess the tool's return value and behavior. The description is incomplete even for a seemingly simple tool.

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 covers both parameters (pageId and sessionId) with clear descriptions, achieving 100% schema description coverage. The tool description adds no additional parameter semantics, but the schema already documents them sufficiently, so baseline 3 is appropriate.

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 'Page URL' is a noun phrase that essentially restates the tool name without specifying an action verb. It does not explicitly state whether the tool retrieves, sets, or otherwise manipulates the page URL, making it a tautology rather than a clear purpose statement.

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?

No guidance is provided on when to use this tool versus alternatives such as browser_page_title or browser_navigate. The description offers no context for choosing this tool over siblings, so usage guidance is absent.

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