update_account

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

No annotations are provided, so description carries full burden. It explains what each setting controls but does not disclose side effects, prerequisites (e.g., username availability), or whether changes are immediate/reversible. Adequate but not rich.

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?

Two sentences: first statement of purpose and optionality, second listing key settings and pointing to sibling. No fluff, highly efficient.

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?

Explains most settings and links to sibling tool for related functionality. However, does not cover two parameters (device_name, unrestricted_unidentified_sender) and lacks return value or error behavior. Reasonably complete given tool simplicity.

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 covers 100% of parameters, so baseline is 3. Description adds context for 4 of 6 parameters (discoverable_by_number, number_sharing, username, delete_username) but omits device_name and unrestricted_unidentified_sender. No meaningful addition beyond schema.

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?

Description clearly states verb 'Update' and resource 'Signal account-level privacy and identity settings', which is specific and distinguishes from siblings like get_configuration (messaging settings) and update_profile (profile details).

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?

Explicitly notes that all parameters are optional and provides a direct alternative: 'Use get_configuration for messaging settings (read receipts, typing indicators).' Also implies when not to use (i.e., for messaging settings).

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