ha_history_get_current_time

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

No annotations are provided, so the description carries the burden of behavioral disclosure. It adds valuable context by indicating the time is sourced from the Home Assistant server and not from training data. However, it does not specify the output format or timezone details, which would be helpful but not critical for a simple getter.

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 concise with exactly three sentences. The first sentence states the purpose, the second provides usage guidance, and the third gives an explicit skip condition. Every sentence earns its place, and the purpose is front-loaded.

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 tool's simplicity (no parameters, no output schema), the description covers the essential context: what it does, when to use, and when to skip. A minor gap is not describing the return format, but for a current-time getter an agent can infer enough to use it correctly.

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?

The tool has zero parameters, so the input schema is empty. According to the rubric, baseline is 4. The description does not need to explain parameters and adds no parameter info, but nothing is missing.

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 'Returns the current date and time from the Home Assistant server (Home).' It uses a specific verb ('Returns') and resource, and distinguishes itself from sibling history tools by being the only one providing current time.

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 explicitly tells when to use the tool: 'Call this before time-based queries that use relative or named periods...' and when to skip: 'Skip only if an absolute ISO date range has already been stated in this conversation.' It also warns against relying on training data, providing concrete usage context.

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