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

Annotations only declare that this is not read-only and not destructive, so the description must carry the rest, and it usefully discloses the authentication requirement and the start_login bootstrap flow. It omits side-effect details such as whether the email is queued, rate limits, or failure behavior, keeping it short of 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 short, front-loaded passages: the action first, then the access prerequisite. Every sentence earns its place, though the parenthetical Claude Code instruction is somewhat instance-specific padding.

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 one-parameter, no-output-schema notification tool, the description covers the action, the recipient, and the auth path an agent must complete first. Return values need not be explained since there is no output schema, though error/retry behavior is unaddressed.

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?

There is a single parameter with 100% schema description coverage ('Verification request ID'), so the schema already carries the semantics and the baseline of 3 applies. The description adds no format, sourcing, or lookup guidance for the id beyond what the schema states.

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 plus the recipient scope ('send an email notification to the subject of a verification request'), which is more precise than a bare name restatement. It stops short of naming which sibling this displaces (e.g. resend_verification, send_account_email), leaving some differentiation to inference.

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 ACCESS block gives clear prerequisite/auth guidance for calling the tool, which is real operational guidance, but it never says when to prefer this tool over alternatives like resend_verification or trigger_verification. Usage context 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.