paper_account_create

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

Annotations already declare readOnlyHint=false and openWorldHint=false; the description usefully reinforces this by stating the account is persistent and never connects to a real broker. However, it does not address what happens on duplicate names, whether creation is safe to retry, or what state is created — gaps that matter because idempotentHint=false contradicts the presence of a required idempotency_key, and the description leaves that tension unexplained.

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 tight sentences with zero filler, and the core action plus its simulated/local nature are front-loaded. Nothing in it is redundant given the annotations.

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?

This is a state-creating mutation with no output schema, so the agent cannot know whether an account identifier is returned and how to reference the new account in follow-up calls like paper_trade. Combined with four undocumented parameters and no retry semantics, the description is not sufficient for confident 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?

Schema description coverage is 0% and all four parameters are required, yet the description says nothing about any of them. It gives no hint about name uniqueness, currency pattern, balance bounds, or — most critically — what the required idempotency_key is for and how it interacts with idempotentHint=false.

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?

Specific verb and resource: 'Create a persistent local arithmetic simulation account.' It clearly delineates what is being created and, via the second sentence, what it is not (real broker / TradingView Paper Trading). It stops short of naming sibling tools like paper_account_get or paper_account_list, so it is clear but not sibling-differentiated.

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 explains what the account is not connected to, but never states when to use this tool versus alternatives (e.g. that this must precede paper_trade or that paper_account_list should be consulted first). No prerequisites, no exclusions, no named sibling routing.

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