set_user_ssh_keys

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

The description only reiterates the action in the tool name; it does not disclose whether existing SSH keys are replaced, whether the user must exist, or any side effects. Annotations are minimal (non-destructive, closed-world) but don't cover overwriting or key format requirements, so the description carries little value on behavior.

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 with no filler, which is appropriately concise. However, its brevity comes at the cost of essential details, so it is not maximally useful; it is simply short rather than efficiently informative.

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?

For a tool that mutates SSH keys, the description is incomplete. It doesn't state the operation's semantics (add/overwrite), prerequisites, or relationship to related tools. The presence of an output schema helps with return values, but the set behavior is ambiguous.

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 description coverage, and the tool description does not explain any of the three parameters. The meaning of 'key_file' (path vs. key content), 'device' (target device), and 'username' (scope) is not defined, leaving the agent to guess.

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 a specific verb ('Sets') and identifies the resource ('SSH keys') and scope ('for a specific user'), which clearly distinguishes it from sibling tools like list_user_ssh_keys and remove_user_ssh_key. However, it doesn't clarify whether the operation adds a key or replaces all existing keys, limiting the 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, prerequisites, or alternatives. There is no mention of whether it should be used with list/remove operations or special conditions, so the agent receives no contextual direction.

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