current_url

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

No annotations provided, so description carries full burden. It discloses that the operation is 'cheap' (non-destructive, fast) and excludes snapshot data. However, does not mention error conditions or prerequisites like a loaded page.

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?

Single sentence with all key information front-loaded: what it returns and key quality (cheap, without snapshot). No wasted words.

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 no parameters and presence of an output schema (which likely documents return structure), the description is adequately complete. It adds context about cost and snapshot exclusion, sufficient for a simple retrieval 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?

No parameters exist, and schema coverage is 100%. Baseline is 4 for zero-param tools. The description adds value by explaining what the tool returns (URL and title) beyond the empty schema.

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?

Clearly states the tool returns URL and title, and distinguishes from snapshot by noting it's cheap and without snapshot. The verb 'Devuelve' (returns) is specific, and the resource is the current page's URL and title.

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?

Implies usage for quick URL/title checks without need for full snapshot, but does not provide explicit when-not or alternatives among siblings like navigate or get_text. Guidance is implicit but minimal.

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