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

No annotations are provided, so the description carries the full burden. It does disclose key behavioral traits: the payment requirement (x402), the return value (memory's id), the format and size limit of the ciphertext. However, it omits important details such as permission/authentication requirements beyond payment, whether the memory is immutable, and any rate limits. Adequate but incomplete for a mutation tool with no annotations.

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?

Three terse sentences, each carrying distinct and necessary information (what, format/size constraint, payment requirement, return value). No redundancy or filler; front-loaded with the core action.

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 no annotations, no output schema, and only 50% schema coverage, the description covers the essentials (action, format, payment, return) but leaves gaps for a mutation tool: it doesn't explain what happens to existing memories, whether tags are for retrieval, or any access control. It's minimally viable but not rich enough for a state-changing operation.

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 coverage is 50% (ciphertext has a description, tags does not). The description adds meaning by specifying 'standard padded base64 ciphertext, up to 16384 bytes decoded', which is valuable for the ciphertext parameter beyond the schema's 'base64-encoded, client-encrypted content'. However, the tags parameter is completely undocumented in both the schema and the description, leaving a semantic gap for half the parameters.

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 clear verb+resource ('Stores encrypted text memory') and specifies the content type, distinguishing it from siblings like read_memory or share_memory_key. However, it doesn't contrast with extend_memory, which is a closely related write operation, leaving some ambiguity about when to store a new memory versus extend an existing one.

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?

No explicit when-to-use guidance, no prerequisites beyond the payment mention, and no mention of alternatives like extend_memory. The agent is left to infer that this creates a new memory rather than adding to an existing one.

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