VPS_setHostnameV1

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

With no annotations provided, the description must cover behavioral traits. It discloses that changing hostname does not update PTR records, which is a key side effect. It does not mention permissions, reversibility, or other behaviors, so it is adequate but not fully transparent.

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 three sentences: first states purpose, next two provide essential caveats. No redundancy, front-loaded with core function, every sentence adds value.

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 simple tool (2 required parameters, no output schema), the description sufficiently covers purpose, side effects (PTR not updated), and additional prerequisites (DNS records). It is complete for operational guidance.

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?

Input schema coverage is 100% (both parameters described). The description adds no additional meaning beyond schema; it repeats 'hostname' and 'Virtual Machine ID' without further elaboration. 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?

Description clearly states 'Set hostname for a specified virtual machine' and 'configure custom hostnames for VPS instances', providing a specific verb and resource, and distinguishing it from siblings like VPS_resetHostnameV1.

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?

Description provides context on when to use: for custom hostnames, and notes that PTR records won't update automatically, implying need for additional DNS steps. However, it does not explicitly compare to alternatives or state when not to use.

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