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

With no annotations, the description carries the full burden. It does disclose a real behavioral trait — the cost of 2 credits per call — which is genuinely useful, and it hints that only public hosts are addressable. However, it omits permission requirements, rate limits, and whether the target must be routable from the server.

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, front-loaded with the core action and scoping before the cost caveat. No filler or redundant restatement of the name.

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?

There is no output schema and no annotations, so the description is the only source of behavior. It does sketch the return shape ('each router hop with latency'), but a diagnostics tool with two parameters and zero schema documentation should say more about hop limits, timeouts, and failure modes.

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 0%, so the description must compensate. It adds meaning for 'host' by narrowing it to a public host and explains the hop concept, but the second parameter (max_hops, default 20, range 3–30) is never mentioned, leaving half the parameters semantically bare.

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 ('Show the network path ... each router hop with latency') with an explicit scope of origin ('from our server to a public host'). This distinguishes it implicitly from reachability tools like ping, but it never names a sibling to route against.

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 phrase 'to a public host' hints at a precondition, but there is no explicit when-to-use, when-not-to-use, or alternative (ping, port_check, dns_lookup all appear as siblings and overlap in the network-diagnostic space).

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