Version

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

Annotations already cover the safety profile (destructiveHint=false, openWorldHint=true), so the bar is lower, but the description adds nothing beyond the title — no auth requirements, no endpoint path, no format of the returned string. It also reads as a pure read while readOnlyHint=false, a mismatch that goes unaddressed.

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 four-word sentence with zero waste and the outcome front-loaded. It is efficient, though the brevity borders on under-specification rather than tightness.

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?

No output schema exists, so the description should say what the version string looks like or how it is obtained, and it does not. With three undocumented input parameters and no return-shape information, an agent cannot tell whether an empty call suffices.

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?

All three parameters (form, params, json_body) have 0% schema description coverage and the description mentions none of them. Nothing tells the agent what these generic passthrough slots are for or whether they should be left empty for a version call.

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?

"Return server version string" names a concrete verb and a concrete resource, so the agent knows exactly what comes back. It does not differentiate itself from siblings such as vaultwarden_config or vaultwarden_alive, which is the only thing keeping it below a 5.

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?

No when-to-use guidance and no named alternatives, even though vaultwarden_config, vaultwarden_now, and vaultwarden_alive live in the same diagnostic family and could easily be confused. The agent must infer the use case from the name alone.

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