analyze_dns_packets

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

With no annotations provided, the description carries the full burden and does so thoroughly. It warns about the file upload limitation, enumerates supported and unsupported input formats, and specifies the parameter type. It also discloses the return type ('structured dictionary'). This goes beyond a typical description, giving the agent essential behavioral knowledge.

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?

The description is well-structured with clear sections: intro, warning, supported formats, unsupported formats, args, returns. Every sentence adds necessary information; the warning is important and the bullet lists are scannable. It is longer than average but each part earns its place, and the key limitation is front-loaded with the emoji alert.

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?

Given a single parameter, no annotations, and an existing output schema, the description covers all necessary context: what it does, how to pass the file, what limitations exist, and what to expect in return. It explains the return value even though an output schema exists, and provides enough setup guidance to use the tool correctly. No significant gaps remain.

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?

The input schema only shows 'pcap_file' as a generic string with no description. The tool description compensates fully by defining it as an HTTP URL or absolute local file path, and by listing supported and unsupported formats. This provides crucial semantic meaning that the schema lacks entirely.

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 opens with a specific verb and resource: 'Analyze DNS packets from a PCAP file'. This clearly distinguishes it from sibling tools like DHCP and ICMP analyzers. It also states the output type ('comprehensive analysis results'), leaving no ambiguity about what the tool does.

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 description provides explicit when-to-use context ('Analyze DNS packets from a PCAP file') and clear when-not-to-use guidance via the unsupported inputs (web-uploaded files, base64, relative paths). However, it does not explicitly name alternative tools for other packet types, so it lacks the full 'alternatives' component for a 5.

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