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

The description contains an internal contradiction: it says 'Free read' but the SAP MCP execution guidance says 'Pricing: paid read-premium' and calls it a 'paid hosted call.' Although it adds signer-boundary and routing context, the conflicting cost claims are likely to mislead an agent about whether to estimate or pay, undermining trust.

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 opening sentence is concise and front-loaded, but the SAP MCP execution guidance block is verbose and repeats the same instruction about estimating first and using sap_payments_call_paid_tool. This boilerplate is also duplicated in the schema description, making the overall description longer than necessary.

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?

The description covers intent, parameters, routing, and signer boundary, and an output schema exists, so much is covered. However, the 'Free read' versus 'paid read-premium' contradiction leaves a material gap: an agent cannot reliably determine whether a cost estimate is required before calling, which affects successful execution.

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%: the schema already documents the depth default/max and the symbol example. The description reiterates this information without adding new meaning, which meets the baseline for high schema coverage but contributes nothing extra.

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 ('Get') and resource ('Phoenix orderbook') and scopes it with 'for a symbol.' This clearly identifies what the tool does and distinguishes it from sibling orderbook tools like manifest_getOrderbook, despite not naming an alternative explicitly.

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 states this is a read/discovery workflow and a 'Free read,' giving clear context for when to use it over value-moving tools. It also explains how to use the depth parameter. However, it does not explicitly exclude alternatives or compare against other orderbook tools, which keeps it a step below full guidance.

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