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

Beyond the minimal annotation hints, the description discloses meaningful behavioral context: persistence across sessions, a bounded free-beta memory pool, no personal API key requirement, and a prohibition on storing secrets or raw logs. It does not mention eviction or duplicate handling, but the annotations do not contradict the description.

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 compact, front-loads the core purpose with concrete memory categories, and then adds essential constraints and an illustrative example. Every sentence earns its place, and the JSON example clarifies invocation without unnecessary verbosity.

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?

Given the low tool complexity, a complete input schema, and the presence of an output schema, the description covers what to store, what not to store, persistence guarantees, resource bounds, and authentication context. It does not explicitly point to 'recall' for retrieval, but the description is otherwise sufficient for correct tool selection and invocation.

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 input schema already describes all three parameters with 100% coverage, so the description does not need to restate them. It adds a concrete example and reinforces the self-contained content requirement, but most parameter meaning is carried by the schema itself, which makes the baseline 3 appropriate.

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 identifies a specific action, 'persist a durable memory,' and enumerates concrete memory types such as architecture decisions, user preferences, and bug fixes. It is obvious this tool stores information for later reuse, but it does not explicitly distinguish itself from the sibling tool 'recall' beyond the implied persist/retrieve contrast.

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 provides strong when-to-use guidance by listing the categories of memories worth storing, and strong when-not-to-use guidance by warning against secrets and raw logs. However, it never names 'recall' or any other alternative for retrieval, so the routing guidance is implicit rather than explicit.

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