browser_get_url

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

With no annotations, the description carries the full burden. The verb 'Get' clearly indicates a read-only operation with no side effects. However, it does not disclose what happens if no page is loaded, whether the URL refers to the active tab, or whether a browser connection is required. These omissions are notable but not severe for a simple getter.

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 a single, front-loaded sentence with no filler or redundant information. It is appropriately sized for a zero-parameter tool and communicates the core action clearly.

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 zero-parameter getter with an output schema present, the description is mostly complete. It could slightly clarify that 'current page' means the active tab in a multi-tab browser session, but the simplicity of the tool and the presence of an output schema reduce the need for additional detail.

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 tool has zero parameters, so the baseline is 4. The description correctly focuses on the operation rather than parameter details, since there are no parameters to describe. No additional parameter semantics are needed.

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 uses a specific verb ('Get') and a clear resource ('the current page URL'), which is distinct from sibling getters like browser_get_text, browser_get_html, and browser_get_attribute. An agent immediately understands this tool's unique role among the browser_* 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 implies the usage: call this when you need the current page URL. However, it does not explicitly state when to prefer this over alternatives or provide any exclusion criteria. Since there is no sibling specifically for URLs, the guidance is adequate but implicit.

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