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

With no annotations to lean on, the description still discloses meaningful behavior: newest-first ordering, the default-all status scope, that approve_url appears only on pending entries, and the out-of-band email side effect. Gaps remain on pagination, result volume, and auth requirements, but the conditional field behavior is genuinely useful disclosure.

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 resource and ordering front-loaded and no padding. The parenthetical about email delivery is slightly extraneous but still informative, so it does not rise to a 5.

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 single-parameter, read-only list with no output schema and no annotations, the description covers what an agent needs: the scope, ordering, status vocabulary, and the notable approve_url field. Missing pagination/limit behavior is the main residual gap for a list endpoint.

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% and the single status enum is fully documented in the schema, including the same default note. The description restates those values rather than adding new meaning, so the baseline of 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 the resource (approvals requested by this account) and the ordering (newest first), which tells the agent what the call returns. It does not explicitly distinguish itself from approval.status or approval.cancel by name, but the 'list all approvals' framing makes the difference inferable.

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 context is implied rather than stated: the default status ('all') and the note that pending entries carry approve_url hint at the browse-then-act flow. It never says when to prefer this over approval.status, nor whether it is paginated, so the agent must guess at the appropriate call for a single request.

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