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

Annotations already declare readOnlyHint=false, destructiveHint=true, openWorldHint=false, so the safety profile is covered. The description goes beyond them usefully by disclosing the return payload ('returns the board with its list ids') and a hard quota constraint ('free plan allows 5 owned boards'), which is exactly the kind of operational limit annotations cannot express.

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?

Four short sentences, front-loaded with the core action and followed by parameter behavior, return value, and quota. Dense but every sentence carries information; the only minor cost is the semicolon-heavy mid-section that packs template semantics into one line.

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?

With no output schema, the description compensates by describing the return value, and it covers the quota constraint. Remaining gaps are small: ownership/permission nuances and what happens if the free-plan limit is reached are not stated, but nothing essential to invoking the tool correctly is missing.

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 67% (title is undocumented but self-evident). The description earns its place by explaining what each template value actually yields ('blank (To do / In progress / Done), kanban, content or personal'), that it is localized to the user's language, and that `lists` overrides the template's lists while keeping its labels — real semantics beyond the enum and the schema text.

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+resource (creates a board) and immediately scopes it with ownership ('owned by the user') plus what the two optional parameters produce. It does not explicitly differentiate itself from nearby siblings like duplicate_board or import_trello_board, which is the only thing keeping it from a 5.

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 rather than stated: you call it when you want a brand-new board. There is no when-not guidance and no mention of the obvious alternatives (duplicate_board, import_trello_board) that an agent should be choosing between when a board already exists elsewhere.

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