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

Annotations already declare readOnlyHint=true and destructiveHint=false, while the description adds useful behavioral detail: default filtering/sorting, source restriction to place_orders, return contents, and cancellation path. It does not discuss pagination or auth behavior beyond the schema, so a 4 is appropriate.

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?

Front-loads the key scope and default behavior, with no filler sentences. The minor redundancy of 'Read-only' against annotations does not undermine its efficiency.

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?

There is no output schema, but the description names the returned list and its fields, while all four parameters are fully documented in the schema and annotations cover the safety profile. An agent has enough information to call it correctly.

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 100%, and the schema already documents limit, bearer, open_only, and newest_first including defaults. The description echoes the default open/oldest-first behavior but adds no syntax or constraints beyond the schema, so the baseline 3 is correct.

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?

States a specific verb and resource: 'List your own order-book orders (BUY/SELL)' with returned fields. It explicitly distinguishes itself from place_orders and instant buy/sell trades, so an agent can select it confidently.

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?

Gives a clear default ('only OPEN orders, oldest first') and an explicit exclusion that instant buy/sell trades do not appear. It names cancel_order for withdrawal, but does not contrast with browsing tools like get_market, so it stops short of full alternative guidance.

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