device_history

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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, covering the safety profile fully. The description adds no behavioral context beyond that, e.g. no note on pagination, sort order, retention window, or time range limits, which matter for a historical lookup.

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 dense sentence with the resource and scope front-loaded and zero filler. The parenthetical identifier list is efficient rather than rambling; the only minor flaw is the verbless noun-phrase construction.

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 explained, and annotations cover safety. What remains missing is coverage of the 'limit' parameter and any hint of time-window or pagination behavior for a historical query.

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%, so the description must carry the load; it usefully documents the accepted identifier forms for the required 'device' parameter (MAC, nickname, router name or IP). It says nothing about the optional 'limit' parameter, leaving half the parameters undocumented in both schema and description.

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 resource ('presence sessions for one device') and the exact data returned ('when it joined and left'), which clearly separates it from current-state siblings like known_devices or list_devices. However, it never names or contrasts those siblings, so an agent must infer the distinction itself.

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 when-to-use guidance or reference to alternatives such as known_devices, list_devices, or system_log, which are the obvious competing tools for device information. Usage is only weakly implied by the word 'history'.

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