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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description goes further by disclosing the negative behavior — it does not build or return a notebook file and avoids an expensive repeated build — which is genuinely useful context an agent cannot infer from 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?

Two tight sentences with the positive behavior front-loaded and the caveat second; nothing is wasted. It is slightly under-developed on the parameter side but structurally efficient.

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 lookup with no output schema and one parameter, the description covers the return shape (URL plus instructions) and the negative behavior. However, it omits any explanation of the required slug, which is the only input an agent must supply.

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 0% for the single required 'slug' parameter, and the description says nothing about what a slug is, where it comes from, or its format/length constraints. With one undocumented parameter the description must compensate and it does not.

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 and resource ('Return the website's starter notebook URL and concise instructions'), which is concrete enough for an agent to distinguish it from generate_loader_code. It does not explicitly name any sibling, so it falls short of the 5 bar for differentiation.

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 clause 'Does not generate or return the notebook file' implies a contrast with the sibling generation tool, but no alternative is named and no explicit when-to-use condition is given. Usage is only implied rather than stated.

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