Update emoji

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

Annotations already indicate readOnlyHint=false and destructiveHint=false, so the safe-to-modify nature is known. The description adds that it renames, which is consistent. However, it does not disclose any additional behavioral details like permission requirements, whether the old name is freed, or any side effects. The bar is lower given annotations, but no extra context is provided.

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?

A single sentence that is direct and front-loaded. Every word earns its place. No fluff or redundancy.

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 mutation tool with no output schema, the description conveys the core action. However, it could mention prerequisite conditions (e.g., emoji must exist, guild context) or side effects, but the schema covers the guild parameter. Overall, it is nearly complete given the tool's 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 coverage is 67%: the emoji and guild parameters have descriptions, but the 'name' parameter (the new name) does not. The description 'Rename a custom emoji' adds no meaning beyond the verb itself. It does not compensate for the undocumented 'name' parameter, but the schema pattern hints at its format. Baseline 3 is appropriate.

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 clearly states the action: 'Rename a custom emoji.' This is a specific verb (rename) and resource (custom emoji), and it differentiates from sibling tools like create_emoji, delete_emoji, and list_emojis. The purpose 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 implies usage by the verb 'rename' but gives no explicit guidance on when to use this tool vs alternatives. It does not mention exclusions or prerequisites, such as needing the emoji to already exist. With sibling tools present, a clearer note about 'use this to modify an existing emoji' would help, but the intent is inferable.

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