List Devices

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

No annotations are provided, so the description carries the whole burden. It discloses only that results are labeled by recognized model; it says nothing about how long the scan blocks, what happens on timeout, whether it requires permissions, or whether unrecognized devices are still returned.

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 compact sentence that front-loads the action and appends the result note. Nothing is wasted, though the brevity leaves gaps rather than conveying density.

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 2-parameter, no-annotation hardware operation, an agent still lacks timeout behavior, permission requirements, and any hint about the prefix filter. The existence of an output schema covers return values, but operational context is thin.

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 0%, yet the description mentions neither the 'prefix' filter nor the 'timeout' value. Saying it scans 'all' devices arguably misleads an agent about the prefix filter's effect on scope.

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 gives a clear verb and resource ('scan all nearby BLE devices') and adds the useful outcome detail that results mark which models this MCP recognizes. It does not name a sibling or state which alternative it is not, but the discovery role is unmistakable next to connect_device/get_device_status.

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?

There is no explicit when-to-use or when-not guidance and no stated prerequisites, such as BLE permissions or whether an active scan interferes with existing connections. The scan-before-connect flow is only implied by the verb.

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