devices

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

With no annotations provided, the description carries the full burden, but "List" plus zero parameters makes the read-only, side-effect-free nature clear enough. It does not disclose behavior when no devices are attached, when adb is unavailable, or whether the call blocks/polls, which would matter for an agent orchestrating device control.

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?

A single front-loaded sentence with zero filler. Nothing in it is redundant with the structured fields, since the schema is empty.

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?

No output schema exists, so the description must hint at returns, which it does via "readiness and model." For a zero-param listing tool this is close to sufficient; only error/empty-state behavior is 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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; baseline applies. The mention of readiness and model correctly sets expectations about the result fields rather than inventing inputs.

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: "List Android devices known to adb," and adds what each entry contains (readiness and model). Against siblings like click, screenshot, and adb_command, the read-only enumeration intent is obvious, though it never names an alternative explicitly.

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?

No explicit when-to-use or when-not-to-use guidance is given. The natural workflow (call this first to discover devices, then use the control siblings) is only implied by the tool's purpose, and it never mentions prerequisites such as the adb server needing to be running.

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