tailscale_set_nameservers

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

The description adds meaningful behavioral context beyond the annotations: 'Replaces all existing nameservers' explicitly describes the destructive effect, aligning with destructiveHint=true and idempotentHint=true. It does not contradict the annotations and tells the agent what gets overwritten, which is the most important behavioral trait for this operation.

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?

Two short sentences with no filler. The primary action is front-loaded, and the destructive replacement warning is the second sentence, earning its place as critical behavioral information.

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 single-parameter setter with annotations covering mutation and destructiveness, the description is largely complete: it names the target resource, the scope (tailnet), and the destructive replacement behavior. It does not describe the response/return value, but this is a simple mutation tool and the absence is not a major gap.

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%, and the dns parameter is well documented with a type and example ('8.8.8.8', '1.1.1.1'). The tool-level description does not add parameter semantics 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 clearly states the action ('Set') and resource ('DNS nameservers for your tailnet'), and the second sentence clarifies the mutation semantics. It is distinct from tailscale_get_nameservers by verb and from set_search_paths/set_dns_preferences by resource, though it does not explicitly name or contrast those 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?

No guidance is given about when to use this tool versus alternatives such as tailscale_set_dns_configuration, tailscale_set_search_paths, or tailscale_get_nameservers. The description implies its use through the name and resource but provides no exclusions, prerequisites, or conditional routing.

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