initialize_browser

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

With no annotations, the description carries full responsibility for explaining side effects. It merely states initialization for inspection but does not disclose that it opens a browser window, that it's stateful, or that it may need to be closed with close_browser. No security or resource implications are mentioned.

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, concise sentence with no wasted words. It is front-loaded with the action and resource. However, it is so brief that it sacrifices useful specifics, making it slightly less effective than a more informative but still concise description.

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 four parameters, no annotations, and no output schema, this description is incomplete. It doesn't address the initialization flow, expected side effects, or the fact that this tool likely must be called before other inspection tools. A richer description would improve integration.

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 descriptive details for most parameters (timeout, headless, userAgent) and defaults for viewport dimensions, achieving roughly 75% coverage. The description's phrase 'custom options' merely summarizes these parameters without adding new semantic meaning, so baseline 3 is appropriate.

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 identifies the action ('Initialize browser') and the resource ('browser'), with an added purpose ('for inspection') that distinguishes it from sibling navigational or cleanup tools. However, 'inspection' is vague and doesn't specify that this is a prerequisite for subsequent inspection tools.

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?

No explicit when-to-use guidance is provided. The phrase 'for inspection' implies a use case but does not explain when to call this tool before others, or any alternatives. Siblings like navigate_to_page or load_scraper_config could be required first, but nothing is stated.

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