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

With no annotations, the description carries the full burden. It does add genuine behavioral content by disclosing the classification rule: a guard is labeled SELF_GUARDED_VERIFIED only when a checkable status endpoint exists, and invisible guards resolve to NO_VISIBLE_GUARD. That is valuable, but it never states whether the operation is read-only, what permissions it needs, or any side effects, so the safety profile remains undisclosed.

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 dense sentence that front-loads the resource and then the classification semantics, with no filler. It is compact, though the semicolon-clause structure makes it read like a spec fragment rather than an introduction.

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?

There is no output schema, no annotations, and no explanation of what a caller receives back per server. For a tool whose whole value is a per-server verdict, the description should at least outline the returned categories and any input expectations; as written an agent cannot predict the response shape or how to supply 'servers'.

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 required 'servers' array, so the schema itself explains nothing. 'Per-server' weakly implies the input is a list of servers, but the description provides no format, content, or expected element details, leaving the only parameter materially undocumented.

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 names a specific resource (per-server guard census) and conveys the classification axis (SELF_GUARDED_VERIFIED vs NO_VISIBLE_GUARD), so the broad intent is discernible. However, 'guard' is unexplained domain jargon and the description never states what a census of guards actually produces or why an agent would want one, leaving the purpose only partially pinned down. It does not overlap with the dedup_* siblings, so no differentiation credit is needed but none is given either.

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?

There is no when-to-use statement, no prerequisites, and no mention of any alternative tool. Usage is only implied by the notion of taking a census of servers' guards. The agent must infer the triggering scenario entirely.

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