ubuntu_nginx_control

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 disclosing behavioral traits. It only states 'Control Nginx web server on Ubuntu' without mentioning that actions like start, stop, or reload mutate system state, that sudo is likely involved, or what the output/return value looks like. This is inadequate for a service-control 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 a single short sentence with no wasted words, and the key resource ('Nginx') is front-loaded. However, it is so sparse that it sacrifices informative value, though that is not purely a conciseness issue. It could benefit from listing the actions, but as written it is structurally efficient.

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?

With no output schema and no annotations, the description does not explain the operational context: it doesn't mention that it uses an SSH connection, that some actions are destructive, or how results are returned. Given the sibling tools, an agent might infer the domain, but the description alone is insufficient for confident invocation.

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 100%: each parameter is described, including the allowed actions for the 'action' parameter. The tool description adds no extra semantic meaning beyond what the schema already provides, so the 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?

The description uses the vague verb 'Control' but identifies a specific resource: 'Nginx web server on Ubuntu'. It doesn't enumerate the specific operations (start, stop, reload, etc.), making the purpose broad. It is distinguishable from sibling tools like ssh_exec because it targets Nginx specifically, but the verb lacks precision.

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 such as ssh_exec or other ubuntu_* tools. There is no mention of prerequisites (e.g., Nginx installed, active SSH connection) or scenarios where this tool is preferred. Usage is only implied by the tool's name and the presence of sibling tools.

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