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

Annotations already declare a non-read-only, non-destructive, non-idempotent mutation, and the description adds real value by stating what is persisted ('only the tool id and that enum') and what is not affected (recommend_tools). However, with idempotentHint=false the description never says whether repeated calls compound ranking changes, and it gives no confirmation of what the call returns.

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 short sentences with the write effect front-loaded, then the enum, then the scope boundary. No filler, no restatement of the title.

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 mutation with no output schema and no annotations beyond safety hints, the definition covers persistence scope and side-effect boundaries well. It still omits idempotency behavior on repeat calls and any indication of whether a result/confirmation is returned, which an agent needs before submitting feedback.

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 description coverage is 0%, so the description must carry parameter meaning; it does clarify that action is restricted to the three listed values and that tool_id plus action are the only stored fields. But the enum is already in the schema, and tool_id is never explained (e.g. where the agent obtains a valid id), leaving the primary parameter 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 (adjust), a specific resource (this user's check_updates ranking), and the scope (for a listed tool). It also names the sibling surfaces it relates to (check_updates, recommend_tools), so an agent can place it in the toolset without opening the schema.

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 only implied: the agent must infer it is called after seeing a check_updates result and that action must reflect the outcome. The exclusion 'Does not change recommend_tools' is a helpful boundary, but there is no guidance on when to use this versus log_choice, which sounds functionally adjacent among the siblings.

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