browser_get_url

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

With no annotations provided, the description must disclose behavioral traits, but it only states the action. It doesn't mention that the tool returns a URL string, whether it errors if no page is loaded, or if any side effects occur. This leaves the agent uncertain about expected behavior 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 zero unnecessary words. It is appropriately concise for a simple getter tool.

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 tool with one optional parameter and no output schema, the description is minimally viable but incomplete. It lacks clarification about return format, error behavior, and session requirements, which would be helpful for an agent to invoke correctly.

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 only parameter, sessionId, is fully documented in the schema with a clear description ('Browser session ID'), so schema coverage is 100%. The description adds no extra parameter meaning, but the baseline of 3 is appropriate given the schema handles it.

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 'Get the current page URL' is a specific verb+resource statement that clearly identifies the tool's function. It effectively distinguishes from sibling tools like browser_get_title and browser_get_text by targeting the URL specifically.

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 provides no guidance on when to use this tool versus alternatives, no prerequisites (like needing an active session or page), and no exclusions. There is no mention of context such as 'use when you need the address of the current page' or comparison to similar getter tools.

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