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

No annotations are provided, so the description carries the full behavioral burden. It does add genuinely useful non-schema context — the Pro subscription coverage and $0.005 per-call pricing — but omits overwrite semantics, authentication requirements, rate limits, and TTL expiry behavior, which are the traits that matter most for a write operation.

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?

Two short sentences, zero filler, with the core action front-loaded and the cost note kept as a compact second sentence.

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 five-parameter write tool with no annotations and no output schema, the description covers the action and the cost but leaves the agent without overwrite/upsert semantics or confirmation of what is returned. It is minimally adequate rather than complete.

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 100%, so all five parameters are self-documenting, making 3 the baseline. The description's mention of 'namespaced key' and 'optional TTL' restates what the schema already says and adds no format or default details (e.g., tags behavior or TTL default).

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?

States a specific verb (Store) and resource (a value under a namespaced key) plus the optional TTL modifier. It is separable from siblings memory.recall and memory.search by the verb alone, but it never names those alternatives to sharpen the distinction.

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?

There is no when-to-use guidance: no condition for choosing store over recall/search, no note on whether it upserts or how it interacts with existing keys. Usage is only implied by the verb.

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