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

Annotations already declare readOnlyHint=false, destructiveHint=false, and idempotentHint=true, so the write-safety profile is carried by structured data. The description adds the semantic mapping of the two actions but says nothing about duplicate logging, overwriting an existing entry, or what happens when both bed and wake are recorded.

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?

A single short sentence with the action mapping front-loaded and no filler. Every clause carries information the agent needs.

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 two-parameter logging tool with no output schema and annotations covering safety and idempotency, the description plus schema gives enough to call it correctly. Only the overwrite/duplicate behavior is left unstated.

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%: the time parameter is fully documented in the schema, while the action enum has no per-value description. The description partially compensates by explaining that 'bed' means went to bed and 'wake' means woke up, which is genuinely useful disambiguation beyond the bare enum tokens.

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 (log) and resource (bed/wake times) and maps the two enum values to plain-language meanings. It is clearly distinct from the other log_* siblings, though it does not explicitly contrast itself with any of them.

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?

Usage is implied by the verb and the parenthetical gloss of the two actions, but there is no explicit guidance on when to call it versus e.g. log_note or delete_entry when correcting an entry. An agent can infer intent but must guess at correction workflows.

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