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AgentPay — trust routing + spend caps for x402 agents

by io.github.romudille-bit
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gas_tracker

Read-only

Get current Ethereum gas prices (slow, standard, fast)

Use when: You need to know current Ethereum gas prices before submitting a transaction or estimating costs. Not for: you need gas as part of a broader read — market_snapshot already includes standard gwei; only Ethereum mainnet gas is reported. Returns: slow_gwei, standard_gwei, fast_gwei, base_fee_gwei, estimated confirmation times Example response: {"slow_gwei":1.5,"standard_gwei":2,"fast_gwei":3,"base_fee_gwei":1.2,"source":"etherscan"}

Price: $0.000 USDC per call

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": "gas_tracker"
  }
}

Input Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4.6/5.0
Behavior4/5

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

Annotations already declare readOnlyHint=true and openWorldHint=true, covering the safety profile. The description adds useful context beyond that: the specific return fields, the data source (etherscan), and the constraint that only Ethereum mainnet gas is reported.

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

Conciseness4/5

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

Front-loaded with the core purpose and cleanly sectioned into Use when / Not for / Returns / Example. The example response is somewhat redundant with the Returns field list, and the price line is extraneous, but the overall structure is efficient and scannable.

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?

With no output schema and no annotations describing return values, the description compensates by listing the return fields and providing a concrete example response. Nothing an agent needs to call this correctly is missing.

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

Parameters4/5

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

The tool takes zero parameters, which is the baseline 4 for this dimension. Nothing further is needed since there is no input to describe.

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?

States a specific verb (Get) and resource (current Ethereum gas prices) with explicit scope (slow, standard, fast). It also distinguishes itself from siblings by noting only Ethereum mainnet gas is reported, so an agent can tell it apart from market_snapshot without opening any schema.

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

Usage Guidelines5/5

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

Explicit 'Use when' clause names the triggering scenario (before submitting a transaction or estimating costs), and a 'Not for' clause routes the agent to market_snapshot when gas is needed as part of a broader read. The when/when-not/alternative triad is fully covered.

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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