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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds useful non-annotation behavior: the default memory's workspace-wide coverage and the fact that the operation consumes no credits. It does not cover pagination or result-size behavior, but that is mitigated by the presence of an output schema.

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 four short sentences, front-loaded with the action ('List your memories, default memory first'). Each sentence contributes unique information: ordering, default-memory scope, named-memory fields, and cost. No sentence is wasted or redundant.

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 zero-parameter read tool with a rich output schema and clear annotations, the description covers what memories are, the default-vs-named distinction, ordering, and cost. It could optionally tie into the create/update workflow, but nothing essential for correct invocation is missing.

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 rubric the baseline is 4. Schema coverage is 100% (trivially, on an empty object), and there are no parameters needing semantic explanation. The description does not need to compensate for any parameter gap.

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 gives a specific verb+resource ('List your memories') and clarifies scope by contrasting the default memory (whole workspace) with named memories (name, situation, scope). It does not explicitly name or differentiate from sibling tools like create_memory or update_memory, so it falls short of a 5.

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 implied by the core instruction 'List your memories', and the cost note ('Free to use — no credits consumed') helps an agent decide to call it. However, there is no explicit when-to-use guidance, no when-not-to-use conditions, and no mention of alternatives such as create_memory or update_memory.

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