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

Annotations already declare destructiveHint=true and readOnlyHint=false, but the description adds substantial non-redundant context: the action spends credits, phones real people, and is irreversible once sent. It also explains the confirm gate and scheduled-call cancellation path. Minor gap: no detail on partial failure or credit consumption rates.

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?

Front-loads the verb and the high-stakes consequence, then moves through prerequisites, approval flow, and the preview fallback. Four dense sentences with no filler; capitalized warnings are proportionate to the destructive nature.

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 destructive, credit-spending broadcast tool with no output schema, the description covers the entire safety envelope: approvals, prerequisites, confirm semantics, preview behavior, and cancellation of scheduled sends. An agent has everything needed to call it safely.

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 100%, so all eight parameters already carry descriptions. The description reinforces caller_id and recording prerequisites and the confirm semantics, but adds little parameter-level meaning beyond the schema. Baseline 3 is appropriate.

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?

States a specific verb and resource (send/schedule an automated voice call broadcast) plus the key constraint that recipients are real people. It is clearly distinguishable from dialmycalls_send_text and dialmycalls_cancel_call, which are named contextually.

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?

Explicitly names prerequisites (approved caller_id, processed recording) and the sibling tools that provide them, instructs the agent to get user approval before sending, and explains that confirm=false yields a preview instead of sending. It also points to dialmycalls_cancel_call for stopping scheduled sends.

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