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

Adds the key traits the agent needs beyond the annotations: the call consumes credits, requires an approval gate via confirmed=true, and writes are never auto-retried. That explains why destructiveHint=true and idempotentHint=false are set on what looks like a read-style validation. It could go further on cost magnitude or partial-failure behavior, but the gating and non-retry semantics are the important disclosures.

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?

Six short sentences, front-loaded with the purpose before the operational constraints. The opening 'Validate addresses. Validate and standardize...' repeats the title and restates itself, a minor waste in an otherwise tight definition.

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?

With no output schema, the description usefully explains the return: standardized addresses plus a deliverability status per address. Combined with the approval and credit gating, an agent has enough to call it safely. Missing only batching and per-address failure handling, which the schema partly covers.

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 sits at 50%, so the description should carry more weight than it does. It reinforces confirmed=true and that each submitted address is validated, but it says nothing about the full_address vs. structured-fields alternative or the 1000-item batch cap, leaving the nested body variant selection entirely to the schema.

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: 'Validate and standardize US addresses using USPS address data.' That is far more specific than the title alone. It stops short of differentiating from the sibling dealmachine_enrich_address or dealmachine_get_addresses_autocomplete, so an agent must open the schema to know which address tool to pick.

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?

Gives a real prerequisite ('confirmed=true' after user approval before credit use), which is useful when-to-call guidance. It never says when to choose this over the other address-related siblings or when validation is unnecessary, so the routing decision is only implied.

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