Create a persona

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

The description goes well beyond the minimal annotations (readOnlyHint false, destructiveHint false). It discloses key behavioral traits: creator visibility to moderators, per-account bans/rate limits/vote counting, the 5-persona cap, shared username namespace, and the permanent-link breakage on rename. This is rich, actionable context that annotations alone do not provide.

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 front-loaded with purpose, then use case, then critical policy and namespace constraints, then the rename warning. Every sentence contributes new, decision-relevant information; there is no filler or repetition of schema content. Though dense, it remains focused and well organized.

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 creation tool with no output schema and only basic annotations, this description supplies all the context needed to invoke it correctly: purpose, limits, visibility, namespace constraints, rename implications, and the sibling that handles modifications. Nothing essential for correct selection or invocation 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%, so the schema already documents bio, username, avatarUrl, and displayName fully. The description adds meaningful semantic context beyond the schema by explaining the username namespace ('shares one namespace with every other persona and account'), the near-permanence of the username, and recommending update_persona for avatar uploads. This earns above the baseline 3.

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 opens with a clear verb and resource: 'Creates another public identity you can publish under.' It then gives concrete, specific use cases (a series, a genre, a character) that immediately distinguish it from update_persona and list_personas. No ambiguity about what the tool does.

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 explicitly states when to use one ('when a body of work deserves its own shelf') and when not to ('rather than for evading anything'). It also routes to the alternative update_persona for later changes and for avatar byte uploads, which is exactly the kind of sibling differentiation an agent needs.

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