x402 Header Decoder, Payload Linter & 402 Flow Simulator

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

Annotations already declare readOnlyHint=true, destructiveHint=false, idempotentHint=true. The description adds value by disclosing that inputs are applied via AIN Bridge and the tool runs client-side with zero PII and zero network activity. This confirms no side effects and privacy implications beyond what annotations cover.

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?

Two efficient sentences. The first packs the core purpose, while the second clarifies usage context and runtime behavior. No redundant words; every sentence serves a purpose. This is ideal conciseness for a tool with a single parameter and clear annotations.

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?

Given the tool is a decoder/linter with no output schema, the description does not explain what the tool returns (e.g., decoded data structure, lint results). While annotations and schema coverage are strong, omitting output format leaves a gap. The description mentions 'describe the flow' but doesn't specify the output shape, which could confuse an agent.

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 single parameter 'inputs' is fully documented in the schema (100% coverage). The description adds meaning by explaining these are applied via AIN Bridge prefill and referencing the manifest input_schema. This provides operational context not present in the schema alone.

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 clearly states the verb 'decode' and 'lint' with specific resources: 'x402 payment header' and 'exact-scheme PaymentPayload'. It also specifies the audience (developers integrating x402) and the action (describe HTTP-402 flow). This distinguishes it from sibling tools, which are unrelated (e.g., audit_mcp_oauth, baas_provider_comparator).

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?

Explicitly states when to use: 'when a developer is integrating x402 and needs to inspect a header, check a payload shape, or understand the flow.' No explicit when-not or alternatives are provided, but the sibling tools are clearly different, implying this is the right tool for x402 debugging. Guidance is clear but lacks exclusions.

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