system_stats

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

No annotations are provided, so the description carries the full behavioral burden. 'Get' plus 'stats' clearly implies a non-mutating read, and the description usefully enumerates the returned fields, but it does not state permissions, cost, or whether the call has side effects. Adequate but not rich.

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; the verb and resource lead, followed by a compact colon-delimited inventory of what is reported. Nothing could be removed without losing information.

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 parameterless read-only stats tool with no output schema, the description supplies the essential missing piece — a list of the metric categories returned. No return-shape or formatting details are given, but for a summary endpoint this is close to sufficient.

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 takes zero parameters, so per the baseline there is no parameter semantics to document. The description correctly avoids inventing parameters and instead spends its words on what the tool returns.

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 (Get) and resource (overall system stats), then enumerates the exact contents: DB location, documents, chunks, memories, tokens, embedding backend. The word 'overall' distinguishes it in scope from narrower siblings like memory_stats or knowledge_document_stats, though those siblings are never named explicitly.

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?

Usage is only implied by the scope word 'overall' — an agent can infer this is the broad, cross-subsystem health/summary call rather than a targeted one. There is no explicit when-to-use statement and no guidance on when memory_stats or knowledge_document_stats would be preferred instead.

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