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

Annotations already establish read-only, idempotent, non-destructive behavior, so the bar is lower, and the description still adds real value: it discloses the "Corporate tier required" authorization gate and enumerates the delivery channels (webhook, email, Slack, Teams). It does not discuss result volume or limits for a "list all" call.

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?

The first sentence front-loads the core action, followed by filter/delivery context, usage triggers, and the tier gate in a logical order. The 13-value signal-type enumeration is lengthy and arguably belongs in the output schema, but it is scannable and informative.

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 need no explanation, and the description covers scope, filter dimensions, delivery targets, usage triggers, and the tier requirement. It lacks only guidance on volume/pagination for a bulk listing, which is a minor omission for this simple zero-parameter read.

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 the baseline is 4. The description's enumeration of signal types, anomaly categories, and severity levels describes the shape of returned subscriptions rather than inputs, and is not misleading in any way.

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 ("List all alert subscriptions for the authenticated user") and explains what a subscription actually holds, so the agent knows this returns configuration objects rather than market data. It does not name or differentiate itself from the sibling write-side tools (subscribe_insider_alerts, subscribe_people_alerts), which is the only gap.

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?

"Use when asked about alert subscriptions, webhook alerts, or notification settings" gives three concrete trigger phrases, which is clear usage context. It stops short of stating when NOT to use it or pointing to the subscribe_* siblings for creating/modifying subscriptions.

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