renderer_evaluate

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It mentions the key trait 'Does not require debugger pause' but fails to disclose potential side effects, safety implications of arbitrary code execution, return value structure, or prerequisite connections. This is a significant gap for a code execution tool.

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 consists of two concise sentences that are immediately informative and free of unnecessary words or repetition. It earns its place without wasting space.

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 moderate complexity of an arbitrary JavaScript evaluation tool, the description is too sparse. It lacks information about return values, error handling, side effects, and prerequisites beyond what the schema provides. No output schema or annotations compensate for this shortfall, leaving the tool under-specified for an AI agent.

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 covers both parameters with descriptions, and the description adds the context that the expression runs in the renderer process, which enriches the meaning of the 'expression' parameter. However, it does not add further detail about 'connection_id' or the exact evaluation semantics, 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 states the tool evaluates JavaScript in the renderer process, which is a specific verb+resource combination. The phrase 'Does not require debugger pause' differentiates it from sibling evaluate tools, making its purpose unmistakable.

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 clear context: use this tool for evaluating JavaScript in the renderer process, and it explicitly notes that no debugger pause is required. However, it does not mention alternative tools by name or provide explicit when-not-to-use scenarios, so it falls just short of a 5.

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