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

No annotations are supplied, so the description carries the full behavioral burden. It does disclose the return shape in detail (IP, reverse-DNS, loss%, average latency, best/worst RTT) and that the probe is mtr-based, which hints at multi-round measurement. It says nothing about runtime duration, timeouts, or any prerequisites, which matters for an active network probe.

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 sentences, zero waste. The action is front-loaded, followed by the concrete return fields and then the diagnostic purpose.

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?

With no output schema, the description usefully explains what each hop contains. However, the undocumented max_hops parameter and the absence of any note on probe duration or failure behavior leave real gaps for a two-parameter network diagnostic tool.

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 only 50%: host is documented, but max_hops is bare in the schema (only default/min/max constraints). The description never mentions max_hops or hop-limit behavior, so it does not compensate for the coverage gap.

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 gives a specific verb and resource: an mtr-based traceroute to a host, and it enumerates the per-hop return fields. An agent can distinguish it from check_ping or check_dns by the mtr traceroute mechanism, though no sibling is named explicitly.

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?

It states a use context ('diagnosing network paths and identifying where latency / packet loss is introduced'), which implies when to reach for it. But it offers no explicit exclusions or guidance on choosing between this and the neighboring check_ping or check_reverse_ip tools.

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