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

Annotations already declare this as read-only, idempotent, non-destructive, and closed-world, so the description need not repeat safety traits. It adds useful behavioral context by stating that the response includes the introduction, ranked places, and sourced fields. It does not mention error behavior when a slug is unknown, so it falls short of full transparency.

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 efficient sentence with the key information front-loaded: one published guide by slug, plus the response contents. Every phrase contributes to identifying the resource or clarifying its payload.

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 two-parameter read tool with no output schema, the description is largely complete: it identifies the input scope and summarizes the return contents. The main remaining gap is that it does not explain what happens when the requested slug does not exist.

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 100%, so the schema already documents both slug and limit in detail. The description adds no additional parameter semantics beyond implying that the guide is selected by slug.

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 specific verb and resource: fetching one published Kensington guide by slug, scoped as the introduction plus ranked places. This distinguishes it from list_guides, though it does not explicitly contrast with the sibling tools.

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 'by slug' implies the tool is used when a slug is already known, which is enough to suggest usage. However, there is no explicit when-to-use guidance, no exclusions, and no reference to alternatives such as list_guides.

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