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

Beyond the annotations, the description discloses important behavior: only the submitted report is read, invalid reports or ratings return 422 and are not charged, errors and verdict reasons are returned, the tool is fast, pricing and free-pool limits apply, and submitted text is never logged or stored. These details align with readOnlyHint=true, openWorldHint=false, idempotentHint=true, and destructiveHint=false.

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 front-loaded with purpose and return behavior, followed by constraints, billing, and privacy details. It is dense but largely earns its space; minor redundancy appears in repeating smartctl or nvme smart-log after already saying Check an SSD's wear.

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 two-parameter read-only utility with full schema coverage and an output schema, the description is complete: it covers input expectations, output summary, limitations, error handling, pricing, privacy, and performance. Nothing material needed to invoke the tool correctly appears to be missing.

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 100%, so the baseline is 3, but the description adds meaningful context about the optional rated_tbw parameter by explaining that it enables rated-TBW share and gap analysis. It also reinforces that report must be smartctl or nvme smart-log text/JSON, though most parameter detail is already in 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?

The description names a specific verb and resource: check an SSD's wear from a pasted smartctl or nvme smart-log report. It also distinguishes the tool from merely reading SMART PASSED status and lists the concrete outputs, including percentage used, TBW, verdict, and reasons, so an agent can identify its role immediately.

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?

It clearly establishes the required input context, namely a pasted smartctl or nvme report, and states that no commands are run or network calls made. It also warns that SMART PASSED does not rule out failure and that SATA wear is vendor-specific, giving useful when-to-use limits, though it does not name alternative sibling tools.

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