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

Annotations already declare the safety profile (non-read-only, non-destructive, non-idempotent), so the bar is lower. The description adds two things not in the annotations: the account page-count limit that can block creation, and the derived-slug behavior when the slug is omitted. It doesn't say what error surfaces at the limit or on slug collision, which keeps it from 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 tight sentences with zero filler; the creation purpose and the page-limit constraint come first, with slug semantics second. Every clause carries information an agent needs.

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 creation tool with full schema coverage, annotations, and no output schema, the description covers purpose, a key limit, and slug derivation. The remaining gap is failure behavior (limit exceeded, slug conflict), which is a minor omission at this complexity.

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%, so baseline is 3, but the description adds meaning beyond the schema by explaining that the slug is the page's public address and is auto-generated from the title when omitted. That clarifies the optional parameter's default behavior, which the schema alone does not convey.

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 uses a specific verb and resource ("Add a page") and states the page's function as a container to "group monitors under", which separates it from siblings like create_monitor or create_channel. It does not explicitly name a sibling to contrast with, so it falls just short of a 5.

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?

Usage is implied: create a page when you need a grouping container for monitors, subject to the account's page limit. There is no explicit when-not guidance or reference to alternatives such as create_team or list_pages, leaving the agent to infer selection.

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