compression_stats

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

The description indicates a safe read operation ('Retrieve'), but with no annotations, it carries the full burden. It does not disclose any potential side effects, rate limits, or dependencies beyond the basic retrieval 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?

The description is a single concise sentence that front-loads the key action and object. Every word contributes meaning, with no redundancy or unnecessary detail.

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 tool with no parameters and a straightforward retrieval purpose, the description provides sufficient context about the output (compression metrics and token savings). It lacks mention of whether it requires prior actions or if the data is real-time, but it is adequate for a simple stat tool.

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?

There are no parameters, so the description does not need to add parameter information. Schema coverage is 100%, and the description appropriately focuses on what the tool returns rather than parameters.

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 clearly states the tool retrieves compression metrics and token savings from a specific engine. It distinguishes itself from siblings like add_memory and create_entity, which are about memory management operations, by focusing on statistical retrieval.

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 explicit guidance on when to use this tool versus alternatives is provided. While the purpose is clear, the description does not mention prerequisites, context, or exclusions. Usage is implied but not elaborated.

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