cache_stats

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

With no annotations, the description carries the full burden of disclosing behavioral traits. It merely lists metrics without confirming that the tool is read-only, what side effects (if any) exist, or whether it performs any cache maintenance. The absence of any behavioral detail beyond a stat list provides minimal transparency.

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?

The description is a single, compact list of terms that directly conveys the tool's return fields. It is front-loaded with the core information and has no filler. However, it is a fragment rather than a full sentence, which slightly reduces structure clarity but does not harm comprehension.

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 simple stats tool with no parameters and no output schema, the description conveys the available metrics but omits any statement of the tool's overall effect (e.g., 'returns' or 'displays') and any caveats. It adequately lists items for a minimal tool but lacks a complete sentence and usage context, leaving it just at the adequate threshold.

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 accepts zero parameters, so the input schema is empty. The description needs no parameter clarification, and the baseline for no parameters is 4. The description correctly focuses on the output content, which is the relevant information for invocation.

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 enumerates the specific statistical fields (cache size, entry count, hits, misses, hit rate, expired entries), making it clear the tool provides cache statistics. However, it lacks an explicit verb like 'retrieves' or 'returns', and it doesn't differentiate from sibling tools such as cache_cleanup or cache_clear, though its purpose is evident from the name and content.

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 guidance is provided on when to use this tool versus alternatives. The description does not state that this is for inspection as opposed to cache_cleanup or cache_clear, nor does it mention any preconditions or complementary tools. This leaves the agent without explicit selection criteria.

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