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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so safety is covered. The description adds genuinely new behavioral context — that an empty list is a normal result for boards without sections — which prevents an agent from treating it as a failure. It does not describe pagination or volume limits, keeping it short of a 5.

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?

Front-loaded with the triggering condition, then the mechanism, then the edge case, then the account caveat. Four sentences, all functional, though the account-selection sentence is dense and could be split or trimmed.

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 an output schema present, return shape needn't be explained, yet the description still covers the one return behavior an agent must not misread (empty list). Prerequisites and account-ambiguity handling are covered; no meaningful gap remains for a two-parameter read tool.

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 100% and both parameters already document their source and format ("never a board name or URL"), so the schema does the heavy lifting. The description only repeats the boardId provenance, adding little beyond the structured fields.

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?

Uses a specific verb and resource ("lists the sections on a board by boardId") and scopes it explicitly against siblings by noting sections are subdivisions within a single board, so an agent won't confuse it with list_boards or list_board_pins. It also states the derived use case (obtaining a section ID).

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 an explicit trigger ("when the user asks about the sections on a Pinterest board, or when you need a section ID"), names the prerequisite source for boardId (list_boards), and includes a decision rule for the ambiguous-account case: ask the user rather than guessing.

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