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Macfax

by com.macfax
OverviewDiscussionsAdmin

Check a used-Mac listing before trusting it

check_mac_listing
Read-onlyIdempotent

The trust picture for one specific listing, by URL (eBay/Craigslist/OfferUp/Swappa/Facebook/Reddit) or Macfax listing id: whether Macfax knows it, whether it still passes every quality gate, scam/junk/classified/auction flags, when a scan last verified it live, its ask against the configuration's typical asking band, the platform's own seller-reputation figures where the marketplace has them (seller_signals: eBay feedback, Swappa rating; null elsewhere), and whether a verified Macfax report is attached. Facts, not verdicts.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "check_mac_listing"
  }
}

Input Schema

NameRequiredDescriptionDefault
idNoA Macfax listing id (from search results).
urlNoThe listing's URL on the source marketplace.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4.6/5.0
Behavior5/5

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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false. The description adds rich behavioral context: returns facts not verdicts, lists specific data fields (trust flags, price band, seller reputation), and clarifies it does not modify data. 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.

Conciseness5/5

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

Two sentences front-loaded with purpose. Every part adds value: supported platforms, returned data types, and the note about facts vs. verdicts. No wasted words.

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

Completeness5/5

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

No output schema exists, but the description thoroughly explains what the tool returns: trust signals, price band, seller reputation, etc. This is sufficient for the tool's complexity.

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

Parameters5/5

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

Schema coverage is 100% with both parameters described. The description adds value by specifying acceptable URL formats (eBay/Craigslist/etc.) and clarifying that 'id' comes from search results, providing context beyond the schema.

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

Purpose5/5

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

The description clearly states it checks a specific listing for trustworthiness, listing supported platforms (eBay/Craigslist/etc.) and data returned. It distinguishes from sibling tools like search_mac_listings (which searches) and get_mac_report (which gets a report).

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

Usage Guidelines3/5

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

The description implies use when evaluating a specific listing but does not explicitly state when to use this tool vs. alternatives like search_mac_listings or get_mac_price_stats. No 'when not to use' guidance is provided.

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

All Macfax toolsInspect
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