device_list

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the trailing 'Read-only' is redundant repetition rather than added value. The one genuine addition is naming the zustand deviceListStore, which hints this reads client-side app state rather than performing a live scan – but it never states that explicitly or says whether results are cached/stale.

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 the verb and scope first; nothing is padded. The only waste is the trailing 'Read-only.' clause, which merely restates the readOnlyHint annotation.

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 no-parameter listing tool with no output schema, the description is minimally sufficient to call it. It omits what a listed device looks like (id, name, connection state), whether the list reflects live hardware or cached store contents, and whether an empty list is possible – gaps that matter because no output schema defines the return shape.

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?

There are zero parameters, so there is nothing for the description to disambiguate and the baseline of 4 applies. No misleading param language is present.

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 devices known to the CyberBrick app') and even names the backing store, so the operation is unambiguous. It does not differentiate itself from nearby siblings like device_detail, device_status, or device_pool_state, so an agent must infer that this is the broad enumeration versus per-device reads.

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?

The description contains no when-to-use guidance, no prerequisites, and no named alternative. With ten device-related siblings in the list, an explicit 'use device_detail for one device, device_pool_state for pool membership' would have removed real ambiguity.

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