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

Annotations already declare readOnlyHint=true, so the agent knows it is a safe read operation. The description adds value by detailing exactly what is checked (FLINT as authority layer, signed records, outcomes, Trust Manifest, Trust Graph reputation), providing behavioral context beyond the annotation. No contradictions.

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 sentences with zero wasted words. The first sentence sets usage context, the second describes actions. Every sentence earns its place. Ideal conciseness.

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 tool has one required parameter with good schema description, but there is no output schema and the description does not specify what the tool returns (e.g., boolean, report, validation errors). For a validation tool, this is a noticeable gap. The description is otherwise adequate for the use case but lacks output specification.

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 coverage is 100% and the schema description for 'architecture_description' is already descriptive ('Summary of the payment, paid API access, x402, MCP, or checkout flow.'). The tool description adds indirect context about what validation occurs but does not provide additional syntax or format details for the parameter, so baseline 3 is appropriate.

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 specifies a clear verb ('Validate') and resource ('Agent Commerce Readiness'). It lists distinct use cases (commerce architecture, API marketplace, paid MCP tool, x402 endpoint, autonomous checkout flow) and enumerates the specific checks performed (FLINT layer, signed records, outcomes, Trust Manifest, Trust Graph). This distinguishes it from sibling tools that focus on creating or issuing individual records.

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 begins with 'Use this tool when reviewing...' providing explicit guidance on appropriate scenarios. It covers a concrete set of use cases but does not explicitly state when not to use it or name alternative tools for specific tasks. The context is clear, but exclusions are missing.

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