rename_device

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

With no annotations, the description carries full burden. It discloses that the device cache will be updated and recommends refreshing the list. It does not mention side effects or mutability beyond renaming, but the behavior is adequately covered.

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?

The description is well-structured with sections (Args, Returns) and front-loaded with the core action. There is minor redundancy (two sentences saying essentially the same thing), but overall it's concise and efficient.

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?

Given the lack of annotations, the description covers prerequisites, behavior, parameters, and return values comprehensively. It could mention error handling or edge cases, but for a straightforward rename tool, it is sufficiently complete.

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%, but the description compensates thoroughly. For device_identifier, it specifies it can be a current name or IP, with examples. For new_name, it explains it's the new friendly name with an example. This adds significant meaning beyond the schema.

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 clearly states the tool renames a WeMo device, changing its friendly name. It distinguishes from siblings (e.g., control_device, get_device_status) by focusing solely on renaming, a unique action.

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 provides a clear prerequisite: the device must be discovered via scan_network first. It also suggests running scan_network again after renaming. While it doesn't explicitly list when not to use it, the context is sufficient given no alternative renaming tools.

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