get_performance_metrics

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

No annotations exist, so the burden falls on the description. The phrase 'placeholder implementation' indicates incomplete or non-functional behavior, but no side effects, safety, or return expectations are disclosed.

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 sentence, which is concise, but it is too brief to be fully effective. It does not waste words but lacks sufficient detail.

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, no annotations, and a placeholder implementation, the description is insufficient. An agent cannot determine what this tool returns or if it is usable.

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 has zero parameters and schema description coverage is 100%. The description adds no parameter info, but with no parameters, baseline 4 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 states 'Get performance metrics' which is a specific verb and resource, but the qualifier '(placeholder implementation)' undermines clarity about actual functionality. It does not distinguish from sibling tools like get_all_cookies or get_computed_styles.

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 guidance is provided on when to use this tool or when to avoid it. The placeholder status is mentioned but not explained in terms of limitations or alternatives.

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