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x402 Checker (AI Nock)

by io.github.nock-for-mak
OverviewDiscussionsAdmin

hn

Read-only

Paid $0.01 USDC exact on Base: Hacker News search via public Algolia HN API. q= required. Optional tags=story|comment|ask_hn|show_hn|poll|job|front_page|all, sort=relevance|date, hits=1..8. Complements /crypto-news. payTo 0x3903F05a17676566958B0a3E0c21E0bd49B66ea0.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "q": "<q>"
    },
    "name": "hn"
  }
}

Input Schema

NameRequiredDescriptionDefault
qYesSearch phrase (aliases query= search=).
hitsNo1..8 results (default 5).
sortNorelevance (default) or date.
tagsNostory (default), comment, ask_hn, show_hn, poll, job, front_page, or all.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Added

TDQS

C2.6/5.0
Behavior1/5

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

The description discloses a real-world side effect: paying $0.01 USDC on Base and sending funds to a payTo address. This directly contradicts the readOnlyHint=true annotation, which signals the tool does not make state-changing modifications. Because the description contradicts an annotation, this dimension must be scored 1.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact and packs a lot of information into one sentence, but it is not well structured: payment details are front-loaded ahead of the tool's core purpose, and the parameter list is compressed into a dense middle section. There is no wasted wording, but the ordering and readability are only average.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description covers payment, API source, and required parameters, but it omits return format, failure behavior, and any note about how the readOnlyHint should be reconciled with the payment requirement. For a tool with no output schema and a significant monetary side effect, an agent needs more context to invoke it correctly and predict consequences.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, and the schema already documents each parameter's meaning, defaults, and allowed values. The description repeats that information in abbreviated form without adding substantial new semantics, so it stays at the baseline score of 3.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly identifies the tool as a Hacker News search via the public Algolia HN API, giving a specific resource and operation. It also notes that it complements /crypto-news, which helps distinguish it from the sibling crypto_news tool. It lacks a strong imperative form like 'Search Hacker News', but the intent is unambiguous.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description states required and optional parameters, but gives no explicit guidance about when to use this tool versus alternatives. The only comparison is a vague 'Complements /crypto-news', which hints at a boundary but does not explain trade-offs, exclusions, or when another tool would be more appropriate.

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

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