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Novarithm Agent Hub: trust and commerce checks

by com.novarithm.www
OverviewDiscussionsAdmin

fx_cad_chf

[PAID $0.002 USDC/call, x402, eip155:8453] Official CAD/CHF reference rate: latest European Central Bank fixing (or the official peg when CHF is pegged), with the rate date, the method (direct, cross via EUR or peg-derived) and the source attribution. Deterministic, sourced, no estimate.

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": "fx_cad_chf"
  }
}

Input Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Added

TDQS

A4.4/5.0
Behavior4/5

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

With no annotations, the description usefully discloses the per-call charge, x402 payment standard, chain identifier, deterministic and non-estimated behavior, and source and methodology fallbacks. It does not explicitly address read-only safety, publication cadence or staleness, and payment or retrieval failures.

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?

The payment prefix and two compact sentences front-load cost, purpose, source, and reliability without digression. The parentheticals efficiently communicate exceptional behavior and returned metadata.

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?

For a zero-argument paid lookup, it covers cost, network, provenance, derivation method, rate date, attribution, and determinism, which is enough to select and invoke it confidently. Because there is no output schema, the remaining ambiguity around quote orientation, response shape, and update timing is meaningful.

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?

There are zero parameters, so the baseline is 4 and no input semantics remain undocumented. The description reinforces the fixed-pair, latest-rate scope, making it clear that no amount, date, or currency selection is needed.

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?

It precisely identifies a latest official CAD/CHF reference-rate lookup, including the ECB fixing and peg or cross-rate derivation possibilities. The fixed pair and latest reference-rate scope distinguish it from conversion, historical-series, and other pair-specific FX siblings.

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

Usage Guidelines4/5

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

The terms 'official', 'latest', and 'no estimate' establish a clear use case for a sourced reference rate rather than an estimated price. It does not explicitly route agents to fx_convert for amount conversion, fx_timeseries for history, or other siblings for different pairs or rate requirements.

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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