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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds the useful context that the id comes from `remember`/`recall`/`list_memories`, but doesn't disclose behavior like what happens if the id is not found or whether the memory content is returned in full. With annotations covering the read-only nature, a 3 is appropriate.

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 sentence that is front-loaded with the action and resource, and includes the source of the id. Every word earns its place; no filler.

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 single-parameter read tool with an output schema and readOnlyHint annotation, the description is nearly complete. It could mention error behavior for a missing/invalid id, but the output schema likely covers the return shape, and the read-only annotation covers safety. The main gap is the lack of explicit id format guidance.

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?

Schema description coverage is 0%, so the description must compensate. It does explain that `id` is the memory identifier and where to get it, which adds meaning beyond the bare schema. However, it doesn't specify the id format or any constraints, so it only partially compensates for the missing schema descriptions.

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 fetches a single memory by its id, with a specific verb ('Fetch') and resource ('a single memory'). It also names the source of the id (`remember`/`recall`/`list_memories`), which distinguishes it from sibling tools like `list_memories` and `recall`.

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?

The description implies when to use this tool: when you have a specific memory id from one of the listed tools. It doesn't explicitly state when not to use it or name alternatives, but the context is clear enough for an agent to select it over `list_memories` or `recall`.

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