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

Annotations already flag destructiveHint=true and idempotentHint=true, and the description adds real context beyond them: the change propagates to all members ('for everyone'), untouched fields are preserved, and a confirmation step is implied by 'always asks first'. The authorization requirement is also disclosed. The only gap is that it does not spell out what the destructive hint means in practice (e.g., whether prior values are recoverable).

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 compact clauses: what changes and for whom, the partial-update rule, then the permission and confirmation caveat. Scoping information is front-loaded and no sentence is redundant.

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 four-field, all-optional mutation with a full output schema and rich annotations, the description supplies the remaining essentials: blast radius, partial-update behavior, and authorization. An agent has everything needed to decide and invoke correctly.

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 100% and every parameter has an enum or constraint documented in the schema, so the description need not carry that load. It restates the field set and repeats the enum values (en/fa, gregorian/jalali) without adding format, defaulting, or interaction semantics beyond what the schema already provides.

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?

The description names a specific verb (change), resource (organization's settings) and enumerates the fields (name, language, calendar, start of week). The phrase 'for everyone' scopes it as org-wide rather than personal, which implicitly separates it from profile.update or preferences.update, though no sibling is named explicitly.

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?

It states the partial-update contract ('Only the fields given change') and the role gate (Owner or Admin only), which tells an agent the preconditions for calling. It does not, however, contrast this tool with adjacent tools like profile.update, language.update or workspace.structure, so the when-to-prefer-this choice is left to inference.

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