CloakMCP

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

No annotations are provided, so the description carries full burden. It mentions executing JavaScript and returning results but lacks critical behavioral details: whether it runs in a sandbox, error handling, security implications, performance impact, or if it can modify page state. This is inadequate for a tool that executes arbitrary code.

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 front-loaded with the core purpose in the first sentence, followed by a structured Args section. It's efficient with minimal waste, though the Args formatting could be more integrated. Every sentence adds value, but slight improvement in flow is possible.

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 tool's complexity (executing arbitrary JavaScript), no annotations, and an output schema (which handles return values), the description is partially complete. It covers the basic operation but misses safety warnings, execution context details, and error scenarios, which are crucial for such a powerful tool.

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 description coverage is 0%, so the description must compensate. It lists both parameters (page_id, expression) and briefly explains them ('Target page ID', 'JavaScript expression to evaluate'), adding basic meaning beyond the schema's titles. However, it doesn't detail format constraints (e.g., valid page_id sources, expression limits), leaving gaps.

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 specific action ('Execute JavaScript in the page context') and the resource ('page context'), distinguishing it from sibling tools like cloak_click or cloak_type that perform different browser interactions. It directly answers what the tool does without 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?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., needing an open page), exclusions, or compare it to similar tools like cloak_read_page for reading content. Usage context is implied but not explicitly stated.

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