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

The description explicitly discloses the automatic x402 payment challenge completion, which is a significant behavioral side effect. It also indicates a write operation (stores) and size constraints, offering transparency beyond the bare parameters.

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 two concise sentences, directly stating the core functionality and the payment side effect without redundant or ambiguous wording.

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?

The description covers the primary purpose, size limit, and payment behavior, but omits details about the tags parameter, expected return value, or potential errors. Given the absence of an output schema, this leaves meaningful gaps in agent expectations.

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?

Only ciphertext has any descriptive semantics (from both the schema and tool description), while tags lacks any description. The tool description adds no new meaning beyond the schema for ciphertext and none for tags, so parameter coverage is insufficient.

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 action (stores encrypted text memory), the format (base64 ciphertext), and the size limit. It unambiguously identifies the tool's purpose despite not explicitly contrasting with siblings.

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 does not indicate when to use this tool over its siblings (extend_memory, read_memory, etc.). It mentions an automatic payment side effect but provides no decision guidance for alternative selection.

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