Market Intel MCP

FX Convert

fx_convert

Read-onlyIdempotent

Convert an amount from one currency to another at the latest ECB reference rate. Returns the rate, the converted result, and the rate date.

Input Schema

TableJSON Schema

Name	Required	Description
`to`	Yes	Target 3-letter currency
`from`	Yes	Source 3-letter currency
`amount`	Yes	Amount in the 'from' currency to convert. Send it as a number, not a string.

Output Schema

TableJSON Schema

Name	Required	Description
`to`	No
`date`	No
`from`	No
`rate`	No
`amount`	No
`result`	No
`source`	No
`provenance`	No	Where this answer came from. served_at is when Datakoot answered (UTC); upstream lists the official sources consulted. Datakoot may serve a briefly cached copy, so the source's own observation can be older than served_at.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 8, 2026

addedOutput schema / properties / provenance

Added value: +{
+  "description": "Where this answer came from. served_at is when Datakoot answered (UTC); upstream lists the official sources consulted. Datakoot may serve a briefly cached copy, so the source's own observation can be older than served_at.",
+  "properties": {
+    "may_be_cached": {
+      "type": "boolean"
+    },
+    "publisher": {
+      "type": "string"
+    },
+    "served_at": {
+      "format": "date-time",
+      "type": "string"
+    },
+    "upstream": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    }
+  },
+  "type": "object"
+}

Changed1 schema field changedOct 3, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "properties": {
+    "amount": {},
+    "date": {},
+    "from": {},
+    "rate": {},
+    "result": {},
+    "source": {},
+    "to": {}
+  },
+  "type": "object"
+}

First observedSep 6, 2026

TDQS

A3.6/5.0

Behavior3/5

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

Annotations already declare readOnly, idempotent, non-destructive and open-world behavior, so the safety profile is covered. The description adds the ECB reference-rate source as the authoritative origin of the numbers, which is useful context, but says nothing about rate freshness, unsupported currencies, or error behavior.

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?

Two tight sentences with the core action front-loaded and the return payload summarized afterward; no filler or repetition.

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?

An output schema exists, so return values need not be detailed, and the parameters are fully documented in the schema. The description is complete for a simple conversion call, though a note on currency coverage or rate staleness would close the remaining gap.

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 the schema even specifying the numeric-format constraint for amount, so the schema carries the parameter burden. The description adds no syntax or format detail beyond what the schema already provides, making the baseline 3 appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb (Convert) and resource (currency amounts) plus the data source and rate vintage ('latest ECB reference rate'). The word 'latest' implicitly separates it from fx_historical and fx_timeseries, though siblings are never named explicitly.

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 only implied: an agent can infer this is for current conversion rather than time-series or rate lookup, but the description never states when to prefer it over fx_rates or fx_historical, nor any prerequisites such as supported currency coverage.

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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