set_type_name

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

With no annotations, the description carries the behavioral burden. It usefully discloses that the tool returns the updated array and highlights the index 0 convention. However, it does not elaborate on side effects (e.g., immediate disk write), permissions, or reversibility, leaving some gap for a mutation tool.

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?

The description is two sentences, front-loaded with the action and resource. Every word earns its place; no redundant or vague phrasing.

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?

The tool has 4 parameters and no output schema, but the description covers the return value ('Returns the updated array'), the target categories, and the index convention. It could optionally mention dryRun, but that is already in the schema. Overall, it is complete for the tool's 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 100%, so baseline is 3. The description adds semantic value by explaining 'Index 0 is the conventional empty slot', which enriches the meaning of the index parameter beyond the schema's '0 = empty slot'. This extra context justifies a score above baseline.

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 the specific verb 'Rename' and clearly identifies the resource as 'one entry in a System.json type-name array' with enumerable categories. This distinguishes it from sibling tools like set_term (which likely handles different data) and get_types (which likely reads rather than writes).

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 provides clear context: use this tool when you need to rename a single entry in one of the listed type-name arrays. It does not explicitly mention alternatives or when not to use, but the context is unambiguous given the tool's specialized scope.

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