Agent Data API

base_transaction_summary

Human-readable summary of a Base transaction: status, block and time, sender and recipient, ETH value, gas used and fee, method selector, and decoded ERC-20 transfers with token symbols and amounts. Costs $0.005 USDC on Base via x402.

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": {
      "hash": "<hash>"
    },
    "name": "base_transaction_summary"
  }
}

Input Schema

Name	Required	Description	Default
`hash`	Yes	Transaction hash on Base

Schema Changelog

Changes observed during successful MCP inspections.

First observedOct 24, 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 carries the burden and does disclose a genuinely important behavioral trait: the $0.005 USDC x402 cost. It also tells the agent the shape of the return. It does not say what happens on an unknown hash or whether the call fails vs returns empty, which is the remaining gap.

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?

Two sentences, front-loaded with purpose then cost. The field enumeration is dense but each item is informative; nothing is filler, though the list could be trimmed slightly without losing selection value.

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

Completeness4/5

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

There is no output schema, so the description correctly compensates by enumerating the returned data (status, block/time, parties, value, gas, method, decoded ERC-20 transfers). Cost and chain are covered; error/not-found behavior is the only missing piece an agent would want.

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?

Only one parameter and schema coverage is 100%, with the schema already documenting the hash including its 0x…64-hex pattern. The description adds the implicit "on Base" scoping but no further format or sourcing detail, so baseline 3 applies.

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+resource ("Human-readable summary of a Base transaction") and enumerates the fields returned, so an agent knows exactly what it gets. The chain qualifier plus the field list cleanly separates it from eth_/arbitrum_/optimism_/polygon_transaction_summary siblings.

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?

Usage is implied by the chain prefix and the required hash, but there is no explicit "use this when... / use X instead" guidance, no note that the hash must belong to Base, and no mention of the sibling per-chain summaries. The agent must infer routing from the tool name alone.

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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