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FXMacroData

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Policy-Rate Differential Visual Artifact

policy_rate_differential_visual_artifact
Read-only

Build a two-series chart comparing base and quote policy-rate history to visualize the rate differential setup for an FX pair. Access: requires an FXMacroData API key; an anonymous call returns subscription_required with a subscribe link.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
baseYesBase currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, CNY, DKK, EUR, GBP, HUF, ILS, JPY, KRW, MYR, NGN, NOK, NZD, PEN, SEK, THB, TWD, USD.
quoteYesQuote currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, CNY, DKK, EUR, GBP, HUF, ILS, JPY, KRW, MYR, NGN, NOK, NZD, PEN, SEK, THB, TWD, USD.
end_dateNoInclusive upper bound, YYYY-MM-DD.
start_dateNoInclusive lower bound, YYYY-MM-DD.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • changedInput schema / properties / base / description
      Previous value: -"Base currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, CNY, DKK, EUR, GBP, ILS, JPY, NGN, NOK, NZD, PEN, SEK, THB, USD."New value: +"Base currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, CNY, DKK, EUR, GBP, HUF, ILS, JPY, KRW, MYR, NGN, NOK, NZD, PEN, SEK, THB, TWD, USD."
    • changedInput schema / properties / quote / description
      Previous value: -"Quote currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, CNY, DKK, EUR, GBP, ILS, JPY, NGN, NOK, NZD, PEN, SEK, THB, USD."New value: +"Quote currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, CNY, DKK, EUR, GBP, HUF, ILS, JPY, KRW, MYR, NGN, NOK, NZD, PEN, SEK, THB, TWD, USD."
  2. Changed4 schema fields changed
    • removedInput schema / properties / base / title
      Removed value: -"Base"
    • removedInput schema / properties / end_date / title
      Removed value: -"End Date"
    • removedInput schema / properties / quote / title
      Removed value: -"Quote"
    • removedInput schema / properties / start_date / title
      Removed value: -"Start Date"
  3. Changed2 schema fields changed
    • changedInput schema / properties / base / description
      Previous value: -"Base currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, CNY, DKK, EUR, GBP, IDR, ILS, JPY, NGN, NOK, NZD, PEN, SEK, THB, USD."New value: +"Base currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, CNY, DKK, EUR, GBP, ILS, JPY, NGN, NOK, NZD, PEN, SEK, THB, USD."
    • changedInput schema / properties / quote / description
      Previous value: -"Quote currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, CNY, DKK, EUR, GBP, IDR, ILS, JPY, NGN, NOK, NZD, PEN, SEK, THB, USD."New value: +"Quote currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, CNY, DKK, EUR, GBP, ILS, JPY, NGN, NOK, NZD, PEN, SEK, THB, USD."
  4. Changed2 schema fields changed
    • changedInput schema / properties / base / description
      Previous value: -"Base currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NGN, NOK, NZD, PEN, SEK, THB, USD."New value: +"Base currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, CNY, DKK, EUR, GBP, IDR, ILS, JPY, NGN, NOK, NZD, PEN, SEK, THB, USD."
    • changedInput schema / properties / quote / description
      Previous value: -"Quote currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NGN, NOK, NZD, PEN, SEK, THB, USD."New value: +"Quote currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, CNY, DKK, EUR, GBP, IDR, ILS, JPY, NGN, NOK, NZD, PEN, SEK, THB, USD."
  5. Changed2 schema fields changed
    • changedInput schema / properties / base / description
      Previous value: -"Base currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NGN, NZD, PEN, SEK, THB, USD."New value: +"Base currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NGN, NOK, NZD, PEN, SEK, THB, USD."
    • changedInput schema / properties / quote / description
      Previous value: -"Quote currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NGN, NZD, PEN, SEK, THB, USD."New value: +"Quote currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NGN, NOK, NZD, PEN, SEK, THB, USD."
  6. Changed2 schema fields changed
    • changedInput schema / properties / base / description
      Previous value: -"Base currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NZD, PEN, SEK, THB, USD."New value: +"Base currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NGN, NZD, PEN, SEK, THB, USD."
    • changedInput schema / properties / quote / description
      Previous value: -"Quote currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NZD, PEN, SEK, THB, USD."New value: +"Quote currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NGN, NZD, PEN, SEK, THB, USD."
  7. Changed2 schema fields changed
    • changedInput schema / properties / base / description
      Previous value: -"Base currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NZD, PEN, SEK, USD."New value: +"Base currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NZD, PEN, SEK, THB, USD."
    • changedInput schema / properties / quote / description
      Previous value: -"Quote currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NZD, PEN, SEK, USD."New value: +"Quote currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NZD, PEN, SEK, THB, USD."
  8. Changed2 schema fields changed
    • changedInput schema / properties / base / description
      Previous value: -"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, MXN, NZD, PEN, PLN, SEK, THB, TWD, USD."New value: +"Base currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NZD, PEN, SEK, USD."
    • changedInput schema / properties / quote / description
      Previous value: -"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, MXN, NZD, PEN, PLN, SEK, THB, TWD, USD."New value: +"Quote currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, NZD, PEN, SEK, USD."
  9. Changed2 schema fields changed
    • changedInput schema / properties / base / description
      Previous value: -"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, AUD, BRL, CAD, CHF, DKK, EUR, GBP, IDR, ILS, JPY, MXN, NZD, PEN, PLN, SEK, THB, TWD, USD."New value: +"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, MXN, NZD, PEN, PLN, SEK, THB, TWD, USD."
    • changedInput schema / properties / quote / description
      Previous value: -"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, AUD, BRL, CAD, CHF, DKK, EUR, GBP, IDR, ILS, JPY, MXN, NZD, PEN, PLN, SEK, THB, TWD, USD."New value: +"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, AUD, BRL, CAD, CHF, CNH, DKK, EUR, GBP, IDR, ILS, JPY, MXN, NZD, PEN, PLN, SEK, THB, TWD, USD."
  10. Changed2 schema fields changed
    • changedInput schema / properties / base / description
      Previous value: -"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, THB, TRY, TWD, USD, UYU, VND."New value: +"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, AUD, BRL, CAD, CHF, DKK, EUR, GBP, IDR, ILS, JPY, MXN, NZD, PEN, PLN, SEK, THB, TWD, USD."
    • changedInput schema / properties / quote / description
      Previous value: -"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, THB, TRY, TWD, USD, UYU, VND."New value: +"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, AUD, BRL, CAD, CHF, DKK, EUR, GBP, IDR, ILS, JPY, MXN, NZD, PEN, PLN, SEK, THB, TWD, USD."
  11. Changed2 schema fields changed
    • changedInput schema / properties / base / description
      Previous value: -"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."New value: +"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, THB, TRY, TWD, USD, UYU, VND."
    • changedInput schema / properties / quote / description
      Previous value: -"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."New value: +"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, THB, TRY, TWD, USD, UYU, VND."
  12. Changed2 schema fields changed
    • changedInput schema / properties / base / description
      Previous value: -"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, ISK, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."New value: +"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."
    • changedInput schema / properties / quote / description
      Previous value: -"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, ISK, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."New value: +"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."
  13. Changed2 schema fields changed
    • changedInput schema / properties / base / description
      Previous value: -"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."New value: +"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, ISK, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."
    • changedInput schema / properties / quote / description
      Previous value: -"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."New value: +"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, ISK, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."
  14. Changed2 schema fields changed
    • changedInput schema / properties / base / description
      Previous value: -"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."New value: +"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."
    • changedInput schema / properties / quote / description
      Previous value: -"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."New value: +"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."
  15. Changed2 schema fields changed
    • changedInput schema / properties / base / description
      Previous value: -"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, CNH, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."New value: +"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."
    • changedInput schema / properties / quote / description
      Previous value: -"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, CNH, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."New value: +"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."
  16. Changed2 schema fields changed
    • changedInput schema / properties / base / description
      Previous value: -"Base currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, DKK, EUR, GBP, JPY, NZD, PEN, PLN, SEK, SGD, USD."New value: +"Base currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, CNH, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."
    • changedInput schema / properties / quote / description
      Previous value: -"Quote currency, 3-letter ISO code (case-insensitive). Supported: AUD, BRL, CAD, CHF, DKK, EUR, GBP, JPY, NZD, PEN, PLN, SEK, SGD, USD."New value: +"Quote currency, 3-letter ISO code (case-insensitive). Supported: AED, ARS, AUD, BOB, BRL, CAD, CHF, CLP, CNH, COP, CZK, DKK, DZD, EGP, EUR, GBP, HKD, HUF, IDR, ILS, INR, JPY, MAD, MXN, MYR, NGN, NOK, NZD, PEN, PHP, PKR, PLN, RUB, SAR, SEK, SGD, THB, TRY, TWD, USD, UYU, VND, ZAR."
  17. Added

TDQS

A4/5.0
Behavior4/5

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

Annotations declare readOnlyHint=true, openWorldHint=true, destructiveHint=false, and the description adds concrete behavioral details about authentication ('requires an FXMacroData API key') and error response ('anonymous call returns subscription_required with a subscribe link'). This goes beyond annotations, providing practical operational context, though it does not describe the output format.

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 description is exceptionally concise: two sentences, the first stating the core purpose and the second noting access requirements. Every sentence contributes value, and the information is front-loaded with the primary action.

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?

Given the schema covers all parameters and the tool name indicates a visual artifact, the description is fairly complete. It specifies the chart type, the access requirement, and the error behavior. The main missing element is the exact return format (e.g., image URL), but this is a minor gap given the 'visual artifact' naming convention and typical usage patterns.

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 coverage is 100%, with each parameter having a description in the schema. The tool description adds no additional parameter-specific information beyond what the schema already provides, so the baseline of 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?

The description states a specific action ('Build a two-series chart comparing base and quote policy-rate history') and the intended purpose ('visualize the rate differential setup for an FX pair'). This clearly differentiates it from other visual artifact tools by specifying policy-rate differential, making its function unambiguous.

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?

The description clearly implies when to use this tool (when visualizing policy-rate differentials for an FX pair) but does not explicitly mention alternative tools or exclusions. It lacks explicit guidance such as 'use this instead of X' or 'do not use if you need a different chart type', leaving usage context somewhat implied.

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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