fx_navigate

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

With no annotations provided, the description alone must carry behavioral disclosure. It only states the action and does not mention whether navigation waits for page load, replaces the current page content, what happens on invalid URLs, or what the tool returns.

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. Every word contributes to the core meaning.

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 one-parameter navigation tool, the description covers the essential operation and the 'active tab' scope. However, with no output schema and no annotations, important operational details such as load-wait behavior, failure handling, and return value are missing, leaving the agent to infer them.

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 no description for the url parameter, and the tool description merely repeats the word 'URL' without adding format, scheme, or validity requirements. The schema lists zero required parameters, which conflicts semantically with a tool that needs a destination URL, and the description does not resolve this.

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 states a specific verb ('Navigate'), the resource ('the active tab'), and the destination ('a URL'), making the core action clear. It does not explicitly contrast with sibling tools like fx_page or fx_windows, so it stops short of full differentiation.

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?

There is no guidance on when to use fx_navigate versus alternatives such as fx_page or fx_wait, and no exclusions or prerequisites are mentioned. The phrase 'active tab' implies context but does not explain when this tool should be selected over siblings.

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