put_user_key_value

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

With no annotations, the description carries the full burden. It only says 'Store', which implies mutation, but does not disclose whether it overwrites existing keys, requires authentication, or has any side effects. More details on idempotency or permissions would be needed.

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 a single sentence of 10 words with no redundancy. It is front-loaded and efficiently conveys the core purpose.

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 tool's simplicity and lack of output schema, the description is adequate but incomplete. It does not specify return values, overwrite behavior, or whether the storage is persistent. More context would be beneficial.

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 description mentions 'namespace and key' which aligns with the schema, but does not explain the 'value' parameter beyond what the schema already provides (any JSON-serializable value). Since schema coverage is 0% at the top-level param, the description partially compensates but is insufficient for full clarity.

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 (Store), the resource (per-user key-value preference), and the scoping (by namespace and key). It effectively distinguishes from sibling tools like get_user_key_value and list_user_namespace_values.

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 a write operation but provides no explicit guidance on when to use this tool versus alternatives (e.g., get_user_key_value for reading, delete_user_key_value for deletion). No exclusions or prerequisites are mentioned.

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