status

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

No annotations are provided, so the description carries the behavioral burden. It discloses one meaningful trait — no lease is required — but says nothing about whether the call is read-only, has side effects, or requires any authentication. The one thing it does disclose is genuinely useful context.

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?

Two compact sentences, front-loaded with the primary action and ending with the notable constraint. No wasted text, though "Prove one phone healthy" is slightly idiomatic and could read more plainly as a health check.

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?

An output schema exists, so return-value documentation is unnecessary. For a one-optional-parameter read tool the description covers the modes of invocation and the no-lease constraint. The main gap is the absence of any safety/read-only signal, which with no annotations is left entirely to inference.

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 0% and the phone property is only typed as string-or-null with a null default. The description compensates by explaining the two modes: supplying a phone proves that one healthy, while omitting it lists every configured phone. That is real semantic value not present in the schema, though the expected phone identifier format is still unspecified.

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 a concrete dual purpose: health-check a single phone, or enumerate all configured phones with result codes. It also implicitly distinguishes itself from the lease/release siblings by noting it needs no lease. It stops short of naming a sibling as an explicit alternative, but an agent can tell what it does.

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?

"Needs no lease" implies this can be called outside the lease workflow, which is a usable context cue against lease/release. However, it never states when an agent should prefer status over, say, lease followed by another check, nor any prerequisites or exclusions.

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