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

Annotations declare readOnlyHint=false, destructiveHint=false, openWorldHint=false, consistent with the 'Record' verb (no contradiction). The description adds the 'tool id only' scoping note but says nothing about duplicate handling, overwrite behavior, or whether records accumulate. With safety already covered by annotations, a 3 is fair.

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, front-loaded with the core action and then the scoping constraint. No wasted text, though the parenthetical and the whats_new clause could be integrated more cleanly.

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?

A write/logging tool with no output schema and 0% parameter coverage needs the description to carry more. It conveys the core action and calling context but leaves the 'key' parameter and the 'starred' action undocumented, so an agent can't fully call it from the description alone.

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 0%, so the description must compensate and largely doesn't. It clarifies that 'id' is the tool id but leaves the 'key' parameter entirely unexplained and omits the 'starred' enum value while listing picked/rejected/tried. Two of three parameters remain ambiguous.

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 and resource: 'Record a tool the user explicitly picked/rejected/tried.' An agent can tell this logs a user's tool-selection decision. It partially differentiates from siblings via 'Only used by whats_new,' though it doesn't contrast with other logging/preference tools like save_preferences.

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?

Gives one concrete usage constraint: 'Only used by whats_new,' which frames the calling context. However, it offers no explicit when-to-call trigger, no exclusions, and no mention of alternatives such as save_preferences or forget_me.

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