get_system_clock

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

Annotations already declare readOnlyHint=true, idempotentHint=true and openWorldHint=false, so the safety profile is covered structurally. The description adds domain significance (log timestamps are only as trustworthy as the clock) but no operational traits such as auth requirements, latency, or what a misconfigured clock returns — useful color rather than new behavioral disclosure.

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?

Front-loaded single-sentence purpose followed by a short rationale note. Both parts earn their place and there is no filler, though the note is slightly prose-heavy relative to the size of the tool.

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 read-only, zero-required-parameter tool with an output schema already describing the return values, the description is nearly sufficient. The only real hole is the unexplained 'device' parameter, which keeps it from being fully 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% for the single 'device' parameter, so the description must carry that burden and does not: it never says which device is targeted, that the parameter is optional, or what the null default means. The phrase 'the device clock' only echoes the parameter name.

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: 'Reports the device clock, time zone and DST setting.' This is clearly separable from siblings such as get_system_health or get_system_resource. It does not explicitly name a sibling it is not, so it stops short of a 5, but the purpose is unmistakable.

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 notes imply when this matters — before trusting log timestamps, and when correlating an incident across sites — which is real usage context. However, it never states when to call it versus alternatives (e.g. alongside get_logs, get_log_statistics), nor any preconditions, so guidance remains implied rather than explicit.

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