MCP MeasureMCP Measure

index observed

zero-core-budget

Agent spending mgmt, budget tracking, ROI. Zero Core Budget.

Should I use this

Quality & Safety

A
Description quality
97%
Schema completeness
77%
Naming quality
90%
Poisoning risk
100%
Permission match
100%
Protocol compliance
100%

Based on automated analysis of tool definitions and protocol compliance.

Context Cost

~836Tokens (tool definitions)
~1.2 KBTypical response size
Moderate attention impact (0.65% of 128k context)

This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.

Install

One-Click Install

Add this to your `claude_desktop_config.json` file:

{
  "mcpServers": {
    "zero-core-budget": {
      "command": "npx",
      "args": [
        "@meltingpixels/zero-core-budget"
      ]
    }
  }
}

Runnable packages

npm@meltingpixels/zero-core-budget1.0.0streamable-http

Remote endpoints

https://budget.rugslayer.com/mcpstreamable-http

What it can do

Tool inventory

Tools (6)

🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
🟢list_tools

List all available Harvey Budget tools with pricing and input requirements. Use this for discovery.

Input Schema

{
  "type": "object",
  "properties": {},
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢health

Check Harvey Budget server status, uptime, and payment network configuration.

Input Schema

{
  "type": "object",
  "properties": {},
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢register_agent(agent_id, daily_limit_usd, weekly_limit_usd, category_limits)

Register an agent with daily and weekly budget limits. Free tool - call this before using check_spend or report_spend. Upserts if agent already exists.

Input Schema

{
  "type": "object",
  "properties": {
    "agent_id": {
      "type": "string",
      "description": "Unique agent identifier (e.g. your wallet address or agent name)"
    },
    "daily_limit_usd": {
      "type": "number",
      "minimum": 0.001,
      "maximum": 10000,
      "description": "Maximum daily spending in USD"
    },
    "weekly_limit_usd": {
      "type": "number",
      "minimum": 0.001,
      "maximum": 100000,
      "description": "Maximum weekly spending in USD"
    },
    "category_limits": {
      "type": "object",
      "additionalProperties": {
        "type": "number"
      },
      "description": "Optional per-category weekly limits (e.g. {security: 1.0, content: 2.0})"
    }
  },
  "required": [
    "agent_id",
    "daily_limit_usd",
    "weekly_limit_usd"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢check_spend(agent_id, service_id, amount_usd, category)

Pre-spend budget approval check. Verifies daily/weekly/category limits, estimates ROI from historical data, and suggests cheaper alternatives. Call this BEFORE paying for any service.

Input Schema

{
  "type": "object",
  "properties": {
    "agent_id": {
      "type": "string",
      "description": "Your agent identifier (must be registered first)"
    },
    "service_id": {
      "type": "string",
      "description": "Service you want to pay for (e.g. 'harvey-tools/scrape_url')"
    },
    "amount_usd": {
      "type": "number",
      "minimum": 0,
      "description": "Amount you're about to spend in USD"
    },
    "category": {
      "type": "string",
      "enum": [
        "security",
        "trading",
        "social",
        "content",
        "data",
        "infrastructure",
        "other"
      ],
      "description": "Spending category"
    }
  },
  "required": [
    "agent_id",
    "service_id",
    "amount_usd",
    "category"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
⚪report_spend(agent_id, service_id, amount_usd, category, outcome_success, ...)

Record a completed spend with optional outcome tracking. Call this AFTER paying for a service to track spending and build ROI history.

Input Schema

{
  "type": "object",
  "properties": {
    "agent_id": {
      "type": "string",
      "description": "Your agent identifier"
    },
    "service_id": {
      "type": "string",
      "description": "Service that was used"
    },
    "amount_usd": {
      "type": "number",
      "minimum": 0,
      "description": "Amount spent in USD"
    },
    "category": {
      "type": "string",
      "enum": [
        "security",
        "trading",
        "social",
        "content",
        "data",
        "infrastructure",
        "other"
      ],
      "description": "Spending category"
    },
    "outcome_success": {
      "type": "boolean",
      "description": "Whether the service call succeeded"
    },
    "value_received": {
      "type": "string",
      "description": "Description of value received"
    }
  },
  "required": [
    "agent_id",
    "service_id",
    "amount_usd",
    "category"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}
🟢get_spending_report(agent_id, period)

Detailed spending analytics report. Returns total spent, category breakdown, top services with ROI, and optimization recommendations. Use to understand spending patterns and find inefficiencies.

Input Schema

{
  "type": "object",
  "properties": {
    "agent_id": {
      "type": "string",
      "description": "Your agent identifier"
    },
    "period": {
      "type": "string",
      "enum": [
        "day",
        "week",
        "month"
      ],
      "description": "Report period"
    }
  },
  "required": [
    "agent_id",
    "period"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Community

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Evidence

Recent observations

verifiedversion not recorded6 tools
verifiedversion not recorded6 tools