azeth_subscribe_service

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

No annotations provided, so description carries full burden. Explains the process: fetches URL, parses 402 terms, creates on-chain agreement. Mentions returns and prerequisite (service must advertise terms). Could detail side effects like gas costs, but overall transparent.

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?

Description is concise: a brief paragraph plus a note. Every sentence adds value—purpose, usage, process, returns, and important note about automatic detection. Front-loaded and efficient.

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?

Covers purpose, usage, behavior, prerequisites, and returns. Without an output schema, it names the returned fields (agreement ID, transaction hash, details). Lacks exact format but is sufficient for the tool's complexity (5 params, 1 required, no nested objects).

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%, so baseline 3 applies. The description does not add significant meaning beyond the schema's parameter descriptions; it focuses on high-level behavior rather than parameter details. Adequate but not over-performing baseline.

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 tool subscribes to an x402-gated service by creating a payment agreement. It distinguishes from the sibling tool azeth_pay by specifying it is for setting up a subscription instead of per-request payment, and implicitly differentiates from azeth_create_payment_agreement by focusing on automatic parsing of 402 terms.

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 'Use this when: You want to set up a subscription instead of paying per-request,' and notes that after subscribing, azeth_pay will automatically use the agreement. Provides clear context but does not explicitly list alternatives or when not to use.

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