connect_device

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

With no annotations, the description carries the full burden, and it does add one genuine behavioral fact beyond the tool name: it discovers GATT capabilities as part of the call, not just establishing a link. However, it omits failure behavior (device not found, connection timeout), whether it is idempotent or how to release the connection, and any Bluetooth permission requirements.

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 no filler, which is structurally sound. It is, however, under-specified rather than concise — the brevity is the source of the gaps in parameter and usage guidance.

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 values need not be described, but for a zero-annotation, zero-schema-coverage tool the description should at minimum explain the name-vs-address selection and the connection lifecycle. Neither is present, so an agent could call this with no arguments and have no idea what happens.

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% for both parameters, and the description does not compensate: it never mentions that the device may be targeted either by 'name' or by 'address', nor whether they are mutually exclusive or what address format is expected. With both parameters nullable and optional, the description leaves the primary input decision unexplained.

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 specific verb+resource pair: connecting a designated '心跳元力' BLE device and discovering its GATT services. That is clearly distinguishable from the sibling disconnect_device and from the setters (set_vibration etc.), though it never explicitly names those alternatives. It also does not clarify how the target device is identified, which the ambiguous parameters leave open.

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 statement of when to call this versus list_devices, get_device_status, or disconnect_device, and no prerequisite (e.g. 'call after list_devices to obtain the address'). The agent must infer the call ordering from the BLE domain alone.

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