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

With no annotations, the description carries full behavioral burden, and it does disclose one genuinely useful constraint: the signature must originate from the payer wallet, not from 402Mob. That prevents a real failure mode, but the description says nothing about what submission does (marking the receipt delivered), whether it is idempotent or repeatable, or what errors arise from a mismatched operationId.

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 short sentences, zero filler, with the hard constraint placed immediately after the core action. Nothing is redundant or buried.

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 mutation tool with no annotations, no output schema, and 0% parameter documentation, the description covers only the signing constraint. It leaves the agent guessing about the upstream challenge flow, the meaning of operationId, and what a successful submission produces.

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 0%, so the description must compensate, yet it explains none of the three required parameters. The patterns reveal formats (65-byte hex signature, 64-hex challenge ID, UUID), but nothing tells the agent that challengeId comes from create_delivery_receipt_challenge or what operationId identifies.

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?

States a specific verb (submit), the exact artifact (payer wallet's EIP-191 signature), and the object it targets (a delivery receipt challenge), which separates it from siblings like submit_work_receipt or the create_*_challenge tools. It never names an alternative explicitly, but the resource is narrow enough that an agent can identify it without ambiguity.

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?

Usage is only implied: the mention of 'a delivery receipt challenge' suggests a prior create_delivery_receipt_challenge call, but the description never says so, nor does it state prerequisites or when-not to use it. An agent must infer the workflow ordering from the sibling list.

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