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

With no annotations provided, the description carries full burden. It discloses that this is a 'Money/external-system action — once sent cannot be unsent', requires a verified domain, has a strict approval gate, and enforces recipient limits. This is rich behavioral context beyond what schema/annotations provide.

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 dense yet efficient. Every sentence delivers actionable information: purpose, usage trigger, adapter context, domain verification, recipient limit, and irreversibility. No filler or repetition.

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?

The tool has no output schema and no annotations, but the description covers purpose, usage, constraints, and irreversible consequences. It does not describe the response format, but for a send action that's often acceptable. Overall, it's sufficiently complete for an agent to invoke 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?

Schema coverage is high (86%), but the description adds critical semantic context: `from` must be on a verified domain at Resend, `to` is limited to ≤50 recipients, and `actionId` is required for the approval gate. These nuances go beyond the schema's field descriptions, enhancing parameter understanding.

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 opens with a specific verb+resource: 'Send an approved launch email through the email sending rail'. It clearly states what the tool does and distinguishes it from siblings by referencing the approval gate and the alias relationship with chiefmo_send_approved_email.

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?

Provides explicit when-to-use: 'USE WHEN the user has approved an email publishAction from chiefmo_launch_product and you need to fire the send.' It also gives a prerequisite (check chieflab_list_email_senders first) and constraints like single recipient or short list (≤50).

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