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

No annotations are provided, so the description carries the full burden. It usefully discloses that this persists workspace-level state and that null removes the setting, but says nothing about permissions, whether existing instructions are overwritten, or any side effects on translations already produced.

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 short sentences with zero filler; the primary action and the null-clearing case are both front-loaded and immediately actionable.

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 two-parameter workspace mutation with an output schema present, the description covers purpose, prerequisite source of the ID, and clearing semantics. Only overwrite behavior and permission requirements are left unstated, which are minor gaps at this complexity.

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 0% and both parameters have only bare titles, so the description must compensate. It does so well: mapping_id is tied to the ID from list_language_settings, and custom_style is defined as per-language style instructions where null clears them — the two facts an agent most needs. It stops short of describing acceptable content or length for the style text.

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 uses a specific verb ('Set'/'clear') on a specific resource ('saved per-language style instructions'), which tells an agent exactly what effect to expect. It is distinguishable from siblings like list_language_settings and update_language_formality, though it does not explicitly contrast itself with them.

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 gives the prerequisite for the call (the ID comes from list_language_settings) and states the clearing case (pass null). There is no explicit when-not guidance or named alternative, but the operational context is clear enough to select and invoke correctly.

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