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

Annotations already declare non-read-only, non-destructive, non-idempotent behavior. The description adds genuine context the annotations don't carry: that values are coerced server-side and which boolean spellings are accepted. It does not say what happens with an unknown key or an invalid value, which for a mutation tool is the remaining behavioral gap, so a 3 rather than 4.

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 sentences plus one example, all front-loaded: purpose, coercion semantics, discovery prerequisite, then a concrete illustration. Nothing is redundant and the example earns its place.

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 3-required-parameter mutation with full schema coverage and no output schema, the essentials are covered: how to find keys, what values are accepted, and the type coercion rule. Only edge-case failure behavior (unknown key, invalid value) is 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 100%, so baseline is 3; each property already documents itself, including the boolean coercion note. The description mostly restates the schema's coercion wording, and only the pointer to get_board_settings_schema for valid keys adds new meaning.

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 and resource: 'change a board setting', with the key/value shape implicit. It names the companion discovery tool get_board_settings_schema, which helps separate it from the read-side siblings, though it never explicitly contrasts with get_board_settings or update_board.

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 clear operational context: use it to change a setting, and call get_board_settings_schema first to discover keys and types. The worked example (autoAddAssignees to "off") makes the intended use concrete. No explicit exclusions or when-not guidance, hence not a 5.

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