xkcd_latest

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

The annotations already declare this as a read-only, idempotent, non-destructive, open-world operation, so safety is covered. The description adds little beyond the annotations and does not mention return shape, rate limits, or whether 'latest' may change over time, but it also does not contradict the annotations.

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 a single, front-loaded sentence with no wasted words. It states the operation and scope immediately, which is appropriate for a simple zero-parameter tool.

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 read-only comic retrieval tool with rich annotations and no parameters, the description is nearly sufficient. The main remaining gap is that there is no output schema and the description does not state what the returned comic object contains, but the core operation is clear.

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?

This tool has zero parameters, so there is nothing for the description to document beyond the operation itself. The baseline for a parameterless tool is 4, and the description does not introduce confusion or undocumented inputs.

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 states a clear verb and resource: 'Get the latest xkcd comic.' It is more specific than a bare name and communicates that this returns the newest comic rather than a specific or random one. However, it does not explicitly distinguish the tool from siblings like xkcd_comic or xkcd_random.

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 word 'latest' implies when this tool is appropriate, but there is no explicit guidance such as 'use xkcd_comic when you need a specific issue' or 'use xkcd_random for a random comic.' The usage is inferable from the name and description, but alternatives are not addressed.

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