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

With no annotations, the description carries the full burden of behavioral disclosure. It clearly states that navigation occurs in the current tab, which is a key behavioral trait beyond the tool's name. However, it does not disclose potential side effects like waiting for page load or error handling, though these may be minor for a simple navigation action.

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 sentence with no redundant words. It is front-loaded and directly states the action, making it highly concise and well-structured.

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 parameter, no output schema, and no annotations, the description covers the essential purpose and the key distinguishing behavior (current tab). However, it lacks details on what happens after navigation, error scenarios, or whether it blocks until the page loads. Given the simplicity of the action, the description is minimally acceptable but not comprehensive.

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 schema has only one parameter 'url' with no description, and the tool description does not add meaningful details about URL format, validation, or required protocol. It merely repeats the word 'URL' in the description, providing minimal additional semantic value over the schema itself.

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 'Open a URL in the current tab' clearly specifies the action (open a URL) and the resource (current tab), which distinguishes it from sibling tools like new_tab that open a new tab. It is specific, concise, and unambiguous.

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 tool is for navigating the current tab but does not explicitly state when to use it versus alternatives like new_tab. There is no mention of exclusions or conditions, leaving the agent to infer from the phrase 'current tab'.

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