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

Annotations already declare idempotent, non-destructive write semantics; the description adds the plan gate ('Edge plan'), the partial-update contract (omitted settings stay unchanged), and a quota fact ('never counts toward the daily limit') that is not encoded anywhere in structured data. It does not say what happens on a non-Edge account or whether a confirmation/response shape is returned.

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?

Front-loads the action and resource, then the three channels, then the update semantics, then the quota fact — a sensible priority order with no filler. The quoted example utterances are the only slightly padded element.

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?

An output schema exists so return values needn't be explained, and the description still conveniently covers the empty-call read behavior. Combined with plan gating and partial-update semantics, an agent has enough to call it correctly; only the behavior when the user is not on Edge is unstated.

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 the baseline is 3, but the description adds the key semantic the schema lacks: a null/omitted value means 'leave unchanged' rather than 'disable', and a fully empty call turns into a read. That meaningfully improves correct invocation of the nullable booleans.

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 (turn on/off) and resource (the user's CapitalSnitch email alerts) and enumerates the three distinct alert channels, which maps directly to the three parameters. It does not differentiate itself from the sibling get_my_alerts, so an agent must infer the routing itself.

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?

Gives explicit call patterns ('omit a setting to leave it unchanged', 'call with no settings to see the current ones') plus three example user utterances that anchor intent. No exclusion guidance against get_my_alerts, which handles a similar read use case, so it stops short of full 5-level clarity.

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