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

The description discloses that the portfolio starts unpublished and implies a paid-plan requirement, adding meaningful behavior beyond the annotations. It does not detail failure modes or post-creation effects, but annotations already indicate a non-readonly, non-destructive, non-idempotent mutation.

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 compact and well-structured: it opens with the core purpose and key constraints, then clearly walks through parameter requirements. No filler or redundant phrasing is present.

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?

Given the output schema exists, the description covers essential context: creation behavior, account-level constraint, initial unpublished state, payment requirement, and all parameter constraints. It does not explain error responses or uniqueness handling, but the provided context is sufficient for correct invocation.

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?

The schema already provides 100% description coverage for all four parameters, including formats and constraints. The description largely restates these details rather than adding new semantic relationships or cross-parameter context, so it stays at the baseline for high schema coverage.

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states the action ('Create'), the resource ('portfolio'), and key distinguishing constraints: one per account, starts unpublished, and paid plans only. This differentiates it from update/delete/get portfolio tools and from other create tools among siblings.

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 provides strong contextual guidance by noting one-per-account and paid-plan requirements, which tells the agent when creation is appropriate. It does not explicitly name alternative sibling tools or contrast with update_portfolio, but the constraints effectively convey usage conditions.

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