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

With no annotations provided, the description carries the full behavioral burden and does well: it discloses the data source (RIPEstat), that it is keyless (no API key required), that it is read-only, that results come from observed AS paths, and that neighbours are ordered by observation frequency. It does not cover rate limits or error behavior, but the core operational traits are present.

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?

Front-loaded with the verb and resource, followed by two terse supporting fragments ('complementing asn_prefixes...' and 'Read-only.'). The first sentence is a bit long and nested with parentheticals, but every clause adds useful 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 simple one-parameter tool with no output schema, the description is complete: it covers purpose, data source, read-only nature, return ordering, and the sibling relationship. Nothing essential for correct invocation is missing.

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 coverage is 100% for the single 'asn' parameter, and the schema already provides the example '13335 or AS13335'. The description adds no additional syntax, format, or validation details beyond what the schema supplies, 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 ('Report') and resource ('autonomous system's BGP relationships'), then enumerates exactly what is returned: upstreams, downstreams, and peers. It explicitly names the sibling asn_prefixes as complementary, letting an agent distinguish the two without opening either schema.

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 'complementing asn_prefixes (its routed footprint)' gives clear context for when to use this tool versus that sibling: this one for connectivity, asn_prefixes for routed prefixes. However, it does not state explicit exclusions or when-not to use it relative to other ASN-related siblings like asn_geoip or geo_route.

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