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

No annotations are provided, so the description carries full responsibility. It discloses side effects (destroys current page state, discards unsaved work), auth requirements (same-origin policy, credentials for restricted URLs), rate limits (none), and return type (confirmation). It also notes prerequisites and possible local restrictions. This is comprehensive behavioral disclosure.

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 moderately long but each sentence serves a purpose: purpose, side effects, prerequisites, return, auth, rate limits, usage, and alternative. It is front-loaded with the core purpose and structured logically. Minor redundancy (e.g., mentioning 'loading new page content' and 'change the current page') slightly reduces conciseness, but it remains efficient.

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?

The tool has no output schema and only one required parameter, but the description covers all key aspects an agent needs: prerequisites, side effects, auth, rate limits, return type, and alternative usage. Given the schema's richness, no critical information is missing.

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?

Schema description coverage is 100%, and the schema already provides detailed semantics for each parameter (e.g., URL constraints, tab_id omission, instance_id omission). The tool description adds no additional parameter context beyond what the schema offers, so the baseline of 3 applies.

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 action (navigates), resource (current Chrome tab), and objective (to a specified URL). It explicitly names the alternative 'reload' for refreshing, distinguishing it from navigation. The function is unambiguous and clearly separates from siblings like reload, switch_tab, and close_tab.

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 explicitly says 'Use this to change the current page' and lists the alternative 'reload' for refresh. It also states prerequisites (active Chrome tab, valid URL) and clarifies that the URL must be accessible, with local-only restrictions possible. This gives clear when-to-use and when-not-to-use guidance.

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