CloakMCP

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

With no annotations provided, the description carries the full burden. It discloses that the action returns 'an updated snapshot', which is useful behavioral context about the output. However, it doesn't mention side effects (e.g., whether it triggers page navigation or changes state), error conditions, or performance implications. The description adds some value but misses key behavioral details for a mutation 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 is front-loaded with the core action in the first sentence, followed by return value and parameter details in a structured format. Every sentence earns its place with no wasted words, making it highly efficient and easy to scan.

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 moderate complexity (2 parameters, mutation action), no annotations, and the presence of an output schema (which handles return values), the description is reasonably complete. It covers purpose, parameters, and output context. However, for a mutation tool, it could better address safety, errors, or interaction with sibling tools to reach full completeness.

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 provides clear semantics for both parameters: 'page_id' as 'Target page ID' and 'key' as 'Key name (DOM KeyboardEvent key)', including an example format for the key. This adds meaningful context beyond the bare schema, though it could elaborate on valid key values or constraints.

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 action ('Press a keyboard key') and target ('Enter, Tab, Escape, ArrowDown, etc.'), making the purpose immediately understandable. It distinguishes from siblings like 'cloak_type' (typing text) and 'cloak_click' (mouse clicks), though it doesn't explicitly name these alternatives. The description is specific but could be slightly more precise about distinguishing from all keyboard-related siblings.

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 implies usage for pressing specific keys (e.g., navigation keys) rather than typing text, which differentiates it from 'cloak_type'. However, it lacks explicit guidance on when to use this tool versus alternatives like 'cloak_enter' (if it existed) or other keyboard actions. No exclusions or prerequisites are mentioned, leaving some ambiguity in context.

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