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

With no annotations, the description carries the full burden and discloses important operational behavior: it requires MCP_API_KEY on the MCP connection via x-api-key or Bearer authorization, and non-operator callers receive error_code operator_key_required. It does not explicitly state that the operation is read-only, nor does it describe pagination or the exact shape of the returned settings.

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 description is two tightly written sentences: the first defines the resource and returned fields, and the second covers access control. There is no filler, and the main purpose is front-loaded.

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 listing tool with no output schema, the description provides enough to call it correctly: what it lists, what is returned in principle, who may call it, how authentication is supplied, and what error unauthorized callers see.

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 has zero input parameters, so the baseline is 4. The description adds no parameter information, but none is needed for this schema.

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 gives a specific verb-resource pair: list registered price-change webhook alerts, including their IDs and settings. This clearly distinguishes it from sibling alert tools such as list_budget_alerts, which concerns a different alert type.

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 description establishes an operator-only usage condition and explains which callers are rejected, but it does not explicitly compare this tool with alternatives such as list_budget_alerts or describe when to use listing versus registering or deleting price alerts. Usage is therefore implied rather than fully guided.

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