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

Annotations already declare readOnlyHint=false, openWorldHint=false and destructiveHint=true, so the safety profile is carried structurally. The description adds real context the annotations lack: the per-user scope and the meaning of the two flags. It does not address the surprising destructiveHint, nor whether unset flags are left unchanged or whether the change is reversible.

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?

One sentence, front-loaded with the action and resource, then the two flags and the scope. No filler, nothing that needs to be read twice.

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?

No output schema and no return-value burden, and the core semantics are covered. However, for a mutation tool the description omits whether unspecified flags remain unchanged, whether boardId must be valid/accessible, and what the call returns, leaving gaps an agent must guess at.

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 compensate; it defines 'favorite (starred)' and 'muted (no notifications)' but leaves boardId unexplained and never says which parameters are optional or how omitted ones behave. Partial compensation for a 3-parameter tool.

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 (Sets) plus resource (board preferences) and immediately scopes it as the user's own, which separates it from update_board (board-wide settings) and watch_task. An agent can route correctly 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?

The phrase 'Affects only the user' implies this is a personal-view operation rather than a board mutation, but no alternative is named and no when/when-not condition is given. Usage is inferable rather than explicit.

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