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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safe-read behavior is covered structurally. The description adds that the article is 'public' (no auth implied) and specifies the returned content (metadata and body paragraphs). It does not mention rate limits or pagination, keeping it short of a 5.

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 filler, with the core purpose front-loaded and the sibling routing placed after. Every clause earns its place.

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?

An output schema exists, so return-shape explanation is unnecessary; the description covers purpose, the URL format for the one required param, and routing to alternatives. Nothing an agent needs to invoke it correctly 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% and the single parameter is already documented as 'Canonical CBS Sports article URL'. The description goes further by spelling out the URL pattern (`cbssports.com/<sport>/news/<slug>`), which is genuinely useful format guidance beyond the schema.

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 (Fetch) and resource (CBS Sports article metadata and body paragraphs) with the exact source (canonical URL). It also explicitly names the sibling tools it is not, so an agent can distinguish it from cbssports_headlines and cbssports_sections without opening schemas.

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 second sentence names two concrete alternatives (cbssports_headlines for story lists, cbssports_sections to browse sports sections) and the task each covers. The condition that selects this tool -- having a specific canonical article URL -- is clear from the combination of purpose and alternatives.

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