memory_stats

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

Annotations already declare readOnlyHint=true, and the description adds valuable details about what statistics are returned (breakdowns, storage, expired count). No contradiction with annotations. Description enhances understanding of the tool's behavior beyond mere read-only nature.

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?

Single, well-structured sentence that front-loads the purpose ('Get usage statistics') and efficiently enumerates key outputs. No wasted words.

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?

Although no output schema is provided, the description adequately lists the types of statistics returned. Parameters are well documented. For a read-only stats tool, the description is sufficiently complete for an agent to understand its function and outputs.

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?

Input schema covers all 3 parameters with descriptions (scope, namespace, department). Baseline 3 is appropriate. The description mentions breakdowns by scope/department/type, which adds some context about parameter usage, but does not significantly expand beyond the schema.

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?

Description clearly states the tool retrieves usage statistics, listing specific metrics (total memories, chunks, documents, breakdowns, storage size, expired count). Distinguishes from numerous sibling tools that perform other operations like appending, getting, or replacing memories.

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?

Implied usage for obtaining summary statistics, but no explicit guidance on when to use vs. alternatives like memory_get or memory_insights. Context is clear enough for an agent to differentiate, but lacks direct exclusions or when-not recommendations.

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