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

Annotations already declare readOnly/openWorld/idempotent/non-destructive, so the safety profile is covered. The description adds two genuinely useful behavioral facts not in annotations: the probe runs from a server in Germany (so latency reflects that vantage point) and the result enumerates hops with round-trip times. It omits runtime/timeout behavior, which keeps it from a 5.

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?

A single front-loaded sentence with the vantage point and the returned data stated up front; every clause carries information and there is no filler.

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 two-parameter, read-only tool with full schema coverage and no output schema, the description supplies the critical context (probe location, hop/RTT output) an agent needs to interpret results. Only the absence of expected duration or failure behavior leaves a small 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%, so both parameters (host, family) are already documented at baseline quality. The description adds no additional parameter meaning, such as what 'auto' resolves to or how family affects the trace, so the baseline 3 applies.

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?

States a specific verb and resource ('Traces the network path ... to a host') plus the observable output ('each hop's address and round-trip times'), which is enough to distinguish it from dns_trace/dns_propagation by nature of the path being traced. It stops short of naming a sibling or excluding a closely related tool, so it is clear but not fully differentiated.

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?

Usage is only implied: 'traces the network path' suggests network-layer troubleshooting, but the description never says when to prefer this over dns_trace or dns_propagation, nor any when-not conditions. No prerequisites are mentioned beyond what the schema says about public hosts.

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