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

Annotations already declare readOnly/openWorld/idempotent, and the description adds value with free-hosted-call routing details and the signer boundary (hosted reads never receive keypair bytes). No contradiction with annotations.

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 core first sentence is concise and informative, but a substantial block of boilerplate execution guidance is repeated in the input schema description. Still, it's well-organized and front-loaded with the 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?

For a no-argument read with a true output schema, the description is complete. It gives symbol examples, pricing/routing details, and what data to expect (haircut/imf/mmf functions and weights), so nothing needed to invoke it correctly 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?

The tool has zero parameters, and the description explicitly states 'No arguments', which is consistent with the empty schema. Since there are no parameters to clarify, the baseline 4 applies.

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 states a specific verb ('Get') and resource ('Backpack collateral requirements per asset') and enumerates the output contents ('haircut/imf/mmf functions and weights'). It also provides concrete symbol examples (spot SOL_USDC, perp SOL_USDC_PERP), making it easy to distinguish from other sap_backpack_get_* tools.

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 implies usage for read/discovery workflows via 'Free read' and the SAP execution guidance to 'call directly', but it does not explicitly name alternatives or state when to prefer this tool over related backpack getters. There is no exclusion guidance.

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