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

Annotations declare destructiveHint=true and openWorldHint=true; the description goes beyond that by revealing this REPLACES the whole list, who receives the access (anyone who can open, including shared links, with shared-link read/add limits), and the downstream zw.* calls the page will use.

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?

Dense but front-loaded: the core action and replacement semantics come first, followed by per-resource access meanings and the warning. The mid-sentence zw.* function lists are a slight detour but still earn their 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?

For a destructive, open-world mutation with no output schema, the description covers replacement semantics, access audience, and the confirmation-worthy widening risk. It stops short of noting reversibility or how to recover the prior grant list, which for a whole-list replacement would be worth stating.

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 50%, and the description explains the access-level semantics ('read, add, edit' and 'read or record') and the optional column limiting, adding real meaning for those fields. But workspace, approvalId, and the per-item structures get no coverage from the description, leaving the enum-less access fields partly to inference.

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 — setting the tables, metrics, and tasks an interface may use — and names the sibling interface tools by effect. The scope ('replacing the whole list') is explicit, so an agent can distinguish this from napkin_interfaces_write or napkin_interfaces_publish.

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?

It implies when to use it (changing an interface's data access) and warns to ask the user before widening access, but it never names an alternative tool or states when NOT to call this versus napkin_interfaces_create or napkin_interfaces_write.

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