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

No annotations are supplied, so the description carries the full burden. It does disclose a genuinely useful behavioral constraint — access is limited to API keys present in ADMIN_EMAILS — but says nothing about ordering, pagination, or what a pending record contains, which matters for a tool meant to drive an approval workflow.

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 short clauses with the admin restriction front-loaded in brackets, which is the right order for a gated tool. Nothing is wasted, though the sentence fragments are terse enough to sit near the edge of under-specification.

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 zero-parameter read tool this covers the essentials (what it lists, who may call it), but with no output schema an agent still cannot know what fields a pending contractor entry returns or whether the list is paginated. Given the approval workflow it supports, that gap is a real limitation.

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?

The tool takes zero parameters, so there is nothing for the description to clarify; the baseline for a parameterless tool applies. The admin-identity requirement is correctly framed as an implicit access condition rather than a missing parameter.

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 names a specific verb and resource (承認待ち業者の一覧 / list of pending-approval contractors), which clearly separates it from the broader list_contractors sibling even without naming it. The bracketed admin tag adds a scope qualifier up front.

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 admin-only restriction implies who should call it and the '承認待ち' (pending approval) wording implies the workflow context, but it never explicitly states when to prefer this over list_contractors or review_contractor. Usage is inferable rather than stated.

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