Analyze Page Performance

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

Annotations already provide readOnlyHint=true and openWorldHint=true. Description adds that it uses Playwright and CDP, implying a browser launch and network dependency, which is useful context. It does not contradict annotations.

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?

One concise sentence, front-loaded with action and resource. No extraneous information. Score slightly reduced because it could be grammatically tighter ('Collect' vs 'Collects').

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 the simplicity of one parameter, no output schema, and good annotations, the description is fairly complete. It explains what the tool does and its input. Could mention what metrics are collected or typical output format.

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?

Single parameter 'url' has full schema coverage (100%) with clear description. The tool description does not add new semantics beyond what the schema provides, so baseline score of 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?

Description uses specific verb 'Collect' and resource 'page performance metrics', clearly indicating the tool's function. It specifies the scope 'public http(s) URL' and mentions technology 'Playwright and CDP', leaving no ambiguity.

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?

Description explicitly states the tool works with 'public http(s) URL', guiding when to use. No alternatives given, but with no sibling tools, this is sufficient. Could be slightly enhanced with explicit scenarios.

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