x402-alpha

alpha_macro

Macro economic pulse (FRED + prediction markets + Twitter + Grok). $0.05 USDC. Payment is consumed on execution, including timeouts.

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": "alpha_macro"
  }
}

Input Schema

Name	Required	Description	Default
`theme`	No	Macro theme (e.g., "inflation", "employment", "rates"). Defaults to broad overview.

Schema Changelog

Changes observed during successful MCP inspections.

First observedJun 11, 2026

TDQS

A3.9/5.0

Behavior4/5

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

With no annotations, the description adds value by disclosing the $0.05 USDC cost and that payment is consumed even on timeouts. It does not mention rate limits or data freshness but provides critical behavioral context beyond the schema.

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 concise sentences front-load purpose and critical cost information. No wasted words.

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

Completeness3/5

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

Given the tool's simplicity (1 optional param, no output schema) and many siblings, the description lacks details on return format or what a 'pulse' includes. It is adequate but not complete.

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 tool description adds no extra meaning to the 'theme' parameter beyond what the schema already states. Baseline 3 is appropriate.

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?

Description clearly states it's a 'Macro economic pulse' aggregating data from FRED, prediction markets, Twitter, and Grok. This verb+resource combination is specific and distinguishes it from sibling tools like alpha_news or alpha_prediction.

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?

Description implies usage for macro economic overviews but does not explicitly state when to use this tool versus alternatives like alpha_news or alpha_sentiment. No exclusions or alternative tool names are mentioned.

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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