list_providers

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

With no annotations provided, the description carries the full burden of behavioral disclosure. The word 'List' implies a read-only operation and 'all available' signals the complete result set, but the description does not disclose the return format, how capabilities are represented, or any pagination or performance characteristics. It is adequate for a simple listing tool, but not richly transparent.

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?

A single, front-loaded sentence with no filler. Every word adds meaning: the action, the resource, the scope, and the included capabilities are all communicated efficiently.

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, no-output-schema listing tool, this description is largely complete: it states what is listed and the kind of information returned. It could be slightly stronger by naming example capabilities, but the lack of complexity and parameters makes the current description sufficient for an agent to call the tool correctly.

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 parameters, so there is no parameter semantics to explain beyond the empty schema. The baseline of 4 applies because there is nothing for the description to add about parameters, and the description appropriately avoids inventing any.

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 uses a specific verb ('List') with a clear resource ('all available temporary email providers') and adds the key detail that capabilities are included. This clearly distinguishes it from sibling tools like get_domains or list_mailboxes, which focus on different resources.

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 implies usage when an agent needs to enumerate available providers before creating a mailbox or choosing a provider, but it does not explicitly state when to use this tool versus alternatives. There are no exclusions or named sibling tools for comparison, so the usage guidance remains implicit rather than explicit.

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