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

No annotations are provided, so the description carries the full burden of disclosing behavior. It only states that it fetches a template; it does not mention what is returned, error behavior for missing ids, read-only guarantees, permissions, or any response structure. For a tool with no output schema cont, this is a notable gap.

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 a single, front-loaded sentence with zero filler. It communicates the verb, resource, and parameter in a compact form. The uppercase 'EMAIL' efficiently disambiguates from non-email template tools. Every word earns its place.

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 simple single-parameter getter, the description is minimally viable: it tells the agent what action to take and the required input. However, it lacks an output schema and does not describe the return format, so the agent has incomplete information about what to expect after invocation. This is adequate but has clear gaps.

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 description coverage is 0%, so the description must compensate. It names 'id' and associates it with the template, adding minimal context beyond the schema property name. However, it does not explain what the id is, where to obtain it, or any expected format. The meaning of the parameter is only partially clarified.

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 ('Fetch'), a clear resource ('EMAIL template'), and a precise scope ('by id'). The explicit 'EMAIL' qualifier distinguishes it from SMS template tools, and the singular 'single' contrasts with email_templates_list. The purpose is unmistakable.

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?

Usage context is implied: call this when you need one specific email template and have its id. However, the description does not explicitly state when not to use it, nor does it reference alternatives like email_templates_list or email_templates_get in other channels. The guidance exists but is only implicit.

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