Now

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

The description implies a pure read, while annotations declare readOnlyHint=false, an inconsistency an agent could notice; the mismatch appears to be a conservative default rather than a truthful write claim, but it is still unreconciled. Beyond that, the one-line description adds nothing about whether this endpoint requires authentication, whether the response is cached, or the timezone/format of the returned time. With annotations supplying only a coarse safety profile, the description carries the burden and does not meet it.

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 front-loaded sentence with zero filler, appropriately sized for a trivial endpoint. There is no padding, but the extreme brevity is under-specification rather than disciplined concision.

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 no-output-schema, zero-required-parameter utility call, knowing the purpose may be just enough to invoke it. However, nothing tells the agent whether the three generic wrapper parameters can be ignored, nor what the returned time looks like, leaving real gaps for a tool the agent must call blind.

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?

Three parameters exist (form, params, json_body) with 0% schema description coverage and completely generic, untyped names; the description says nothing about them. Since all three are optional with null defaults, the likely truth is that no parameters are needed, but the agent is left to infer that from the schema rather than being told 'takes no arguments'.

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?

A clear verb+resource pair ('Return current server time') that tells the agent exactly what the call yields, and it is distinguishable from sibling diagnostics like vaultwarden_version and vaultwarden_alive by name. It does not, however, state how this differs from those siblings or when one would be preferred over the other.

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 gives no when-to-use context, no exclusions, and never references the closely related siblings (vaultwarden_version, vaultwarden_alive, vaultwarden_revision_date) that an agent would have to disambiguate from. Usage is at best implied by the phrase 'server time'.

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