plunk_send_transactional

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

With no annotations provided, the description carries the full burden for behavioral disclosure. It mentions the two modes of operation but doesn't disclose any consequences, permissions, error behavior, or the meaning of parameters like 'subscribed'. For a mutation action like sending an email, this is a significant 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 extremely concise: two sentences, front-loaded with the primary action, and no wasted words. It earns its place by conveying the essential usage pattern.

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?

Despite having 11 parameters, nested objects, and no output schema, the description is only two sentences. It doesn't mention return values, error handling, or the role of parameters like subscribed, headers, or reply. For a complex tool, this is incomplete and leaves the agent without crucial context.

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 descriptions cover 64% of parameters, but the description adds meaningful semantics by specifying the 'subject+body OR template UUID' relationship, which is not obvious from the schema alone. It clarifies the mutual exclusivity and reduces ambiguity. However, it doesn't explain undocumented parameters like reply, headers, or subscribed.

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 states exactly what the tool does: 'Send a transactional email.' It uses a specific verb and resource, and clearly distinguishes this from sibling tools like contact management and tracking tools. The subject+body OR template detail further clarifies the scope.

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 provides clear guidance on how to use the tool: provide subject+body or a template UUID. It doesn't explicitly mention alternatives or when not to use it, but among siblings this is the only email-sending tool, and the instruction is sufficient for basic usage.

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