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

Annotations already mark this as non-readOnly, non-idempotent, and destructive. The description adds genuinely useful behavior beyond those flags: it is a hosted unsigned-transaction builder that never receives keypair bytes, requires payment/estimate-first flow, and produces value-moving results that must be finalized locally. The main reason this is not a 5 is that the 'SAP MCP execution guidance' block is generic templated text shared across tools.

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 first sentence is tight and front-loaded with legacy status and the modern alternative. The execution guidance is long but is broken into labeled segments (Intent, Pricing, Routing, Signer boundary), making it scannable. A 5 would require trimming the generic SAP boilerplate, but the structure is still effective.

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 paid, legacy unsigned-transaction builder, the description covers the key operational context: it is legacy, DBC-only, paid, requires estimation before payment, never receives keypair bytes, and must be finalized locally. An output schema exists, reducing the need to explain returns. The main gap is that it does not explain what 'DBC' is or clarify parameter semantics such as amount units, but the description is otherwise sufficient for correct 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?

All five parameters have schema descriptions, so schema_description_coverage is 100%, which sets the baseline at 3. However, the schema descriptions are templated and add no real meaning (e.g., 'Owner address used by sap steve launch build dbc dev buy'). The tool description itself provides zero parameter-level explanation, so it earns exactly the baseline with no extra credit.

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 first sentence states a specific function: a legacy, DBC-only initial-buy builder. It immediately names the replacement tool (sap_meteora_build_launchpad_trade) and the features that distinguish it, so an agent can tell this tool apart from the many other builders in the sibling list without inspecting schemas.

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 gives an explicit when-not-to-use rule: 'New integrations must use sap_meteora_build_launchpad_trade'. It also provides operational routing guidance (estimate first, use sap_estimate_tool_cost, and sap_payments_call_paid_tool if x402 is not native). However, it does not clarify when the legacy tool itself should still be used, nor does it disambiguate from similarly named siblings like sap_steve_launch_build_dbc or sap_perpspad_build_dbc_dev_buy.

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