validate_nest_credentials

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

Given no annotations, the description carries full burden. It discloses the two-step process: optional token refresh, then API call to a specific endpoint. It does not mention side effects like whether token storage is updated, or error behavior on failure. Still, it is fairly transparent for a simple validation tool.

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 two sentences with no fluff. The first sentence is a clear title, the second explains the action. Every word earns its place.

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 tool with no annotations or output schema, the description adequately covers the purpose and main behavioral steps. It could mention what the return value indicates (success/failure) or potential errors, but overall it is sufficient for an AI agent to understand invocation.

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 coverage is 100% (1 parameter with description). The tool description adds value by explaining the sequence: 'optionally refresh… then call SDM devices?pageSize=1', which clarifies the parameter's role beyond its schema description. It provides meaningful context.

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's purpose: validate Nest SDM credentials. It specifies the action (optionally refresh token, then call SDM devices endpoint) which distinguishes it from siblings like refresh_nest_token that only refresh, and get_nest_auth_status that only check 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?

The description provides context for when to use the optional force_refresh parameter ('if calls fail'). It implies the tool is for post-authentication validation. However, it does not explicitly state when to use this tool versus alternatives like refresh_nest_token or get_nest_auth_status.

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