List open positions

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

Annotations already declare readOnlyHint=true and openWorldHint=false. The description adds value beyond annotations by stating the server can 'open, modify and close nothing', and explains the synthetic flag behavior on replay sources. This provides meaningful behavioral context without contradiction.

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 short sentences, each providing essential information. No filler or redundancy. Perfectly sized for a tool with no parameters and clear purpose.

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 no parameters and an output schema present, the description is largely complete. It explains the tool's purpose, return fields, and special behavior (read-only, synthetic flag on replay). One minor gap: it doesn't mention whether the list is always empty in certain modes beyond replay.

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 input schema has no parameters, so the description has no responsibility to document parameters. With 0 parameters and 100% schema coverage, the description adds value by explaining return fields (entry price, current price, floating profit), which aids correct invocation and interpretation.

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 a specific verb ('Return') and resource ('open position'), and lists the fields returned (entry price, current price, floating profit). It clearly distinguishes this tool from siblings like `list_symbols` and `list_orders`.

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 clarifies that the tool is read-only and explains behavior on replay sources (always empty, payload has synthetic=true). However, it doesn't explicitly state when to use this tool over alternatives like `get_account` or `list_orders`, though the purpose is clear enough.

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