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

Annotations already declare readOnly, idempotent and non-destructive, so the safety profile is covered by structured data. The description goes beyond them with genuinely useful context: it explains what a collection is, what fields come back, and explicitly reassures that 'nothing in a notebook changes' when listing collections. It omits pagination and volume behavior, so not a full 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?

A single compact sentence, front-loaded with the verb and a definition of the resource, then the returned fields, the scope, and the non-mutation guarantee. Every clause earns its place; the trailing 'GET /collections' is a cheap, mildly useful anchor.

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?

There is no output schema, so the description compensates by enumerating the fields returned (collection id, name, emoji, notebook ids). Combined with annotations that cover the safety and idempotency profile and a fully documented single parameter, an agent has everything needed to call this correctly.

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?

Only one parameter exists and schema description coverage is 100% ('The account. Default: every account.'), so the schema already carries the semantics. The description restates the same one-account-or-all-accounts scope without adding format, accepted identifiers, or lookup guidance, making it largely redundant. Baseline 3 applies.

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 (list) and resource (collections), then defines the resource itself ('the folders an account groups its notebooks in') and enumerates the returned fields (id, name, emoji, notebook ids). The 'list vs create/update/delete collection' distinction is unambiguous against the sibling tools without opening any schema.

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 tells the agent the scope choice ('for one account or every account'), which is the only real decision point for this call. However, it names no alternatives or exclusions and gives no guidance on when a caller should prefer notebook_list_notebooks or notebook_get_notebook instead; usage is 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.