tab_navigate

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

With no annotations provided, the description carries the full burden of disclosing behavioral traits. It only states 'navigate' without explaining whether it waits for page load, returns any confirmation, handles invalid target IDs, or affects the page's loading state. Since there's no output schema and no extra detail, an agent cannot predict the tool's side effects or return behavior, which is a significant gap for a mutating 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 extremely concise, consisting of a single sentence with no fluff. It front-loads the action and resource, which is good, but it's so minimal that it lacks critical information. While conciseness is valued, this borders on under-specification rather than efficient brevity, so a middle score is warranted.

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 that the tool has no annotations, no output schema, and a very brief description, it is incomplete for an agent to use reliably. It doesn't cover expected behavior, error conditions, or return values, and doesn't reference sibling tools for context. The simplicity of the tool (two parameters, no nested objects) is low complexity, but the lack of behavioral disclosure leaves the definition incomplete.

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 provides descriptions for both parameters (URL and target ID), covering 100% of them. The description adds no additional meaning beyond what the schema already states. Baseline of 3 is appropriate since the schema handles parameter documentation adequately, and the description doesn't contribute extra semantic context such as URL format expectations or how target IDs are obtained.

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 clearly states the verb 'navigate' and the resource 'a tab' with a target URL, which is specific and unambiguous. It implies an existing tab (as opposed to tab_open which creates a new tab), though it doesn't explicitly differentiate from siblings like tab_open or tab_reload. The purpose is clear enough for an agent to infer the core action.

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 gives a clear statement of what the tool does but provides no guidance on when to use it versus alternatives. It doesn't mention when not to use it (e.g., for opening a new tab) or mention any prerequisites like ensuring the tab exists. The context is implied but not explicitly stated, leaving some ambiguity for an agent choosing between this and similar navigation-related tools.

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