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

The description adds useful behavior beyond the annotations: 'fullname is always written (pass the current value to keep it)' explains overwrite semantics, and 'ACTIVE workspace' scopes the optional parameter. This complements the idempotentHint without contradicting the annotations.

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 with no filler; the core behavior is front-loaded and the overwrite caveat is placed immediately. Every clause 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 simple two-parameter mutation with clear annotations, the description covers required input, optional input, and overwrite behavior. No output schema means return values don't need explanation, and nothing needed to call 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 100%, but the description adds actionable guidance by clarifying that fullname is always written and instructing the caller to pass the current value to preserve it. This adds meaning beyond the schema's basic descriptions.

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 states a specific action ('Set the account's full name') and clearly identifies the optional secondary behavior ('rename the ACTIVE workspace'), distinguishing it from workspace-only operations. It names the resource precisely and is unambiguous.

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?

The description makes the main use case clear, but it does not mention when to prefer the sibling rename_workspace for workspace-only renames or any exclusions. An agent might reasonably use this tool for a workspace-only rename even though a more targeted alternative exists.

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