test_url

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

No annotations exist, so description bears full burden. It discloses that a throwaway page is used and closed, and that never-idle pages are flagged (wait_downgraded) not errors. It also explains authentication context differences with/without project. Could mention failure modes but overall well-transparent.

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 multi-sentence but each sentence adds value. It is well-structured: core function first, then behavior, return format, parameter usage, and alternatives. Not overly verbose, but could be slightly more concise.

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 no output schema, description explains return structure (status, title, screenshot path, issues with details). It also covers edge cases like never-idle flags. However, it omits potential error conditions (invalid URLs, timeouts). Overall adequate for the tool's complexity.

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 coverage is 100%, so description adds value beyond schema. It elaborates on checks types and explains the project parameter's effect on authentication context, enhancing understanding beyond the schema's terse descriptions.

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 tool's purpose: screenshot and audit a single URL in one shot, opening and closing a throwaway page. It specifies the verb (screenshot and audit), resource (URL), and distinguishes from siblings like run_checks_on_session by emphasizing the one-shot nature.

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 provides explicit guidance: use for a single URL with optional checks, pass project for authenticated pages, and for multi-step flows or repeated checks use a session instead. This clearly differentiates from alternatives.

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