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euroref — European government reference data

by dev.euroref
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get_series_history

Read-onlyIdempotent

PAID ($0.003). Historical values of a reference series with effective date ranges, optionally filtered by from/to (YYYY-MM-DD). Pass api_key if you have one (instant card checkout at /pricing); otherwise the response explains how to pay via x402. Every DE series is free to try. After a 200, bind get_changes (free poll) or register_alert (HMAC push; Register: $0 · Delivery after trial: $0.05) on this series so a later gazette does not silently retire the value.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
toNoLatest effective date, YYYY-MM-DD
fromNoEarliest effective date, YYYY-MM-DD
seriesYesSeries id
api_keyNoAPI key
countryYesISO country code

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
errorNoPresent on a free refusal or error; no charge
staleNo
seriesNo
countryNo
entriesNo
no_chargeNo
price_usdNo
disclaimerNo
how_to_payNo
bind_seriesNo
explanationNo
label_basisNoInputs and the rule ids that produced the two labels
x_next_bindNo
http_endpointNo
coverage_labelNoHow much of the question is covered: ready = complete; partial = held with a disclosed limitation or default; gap = no number served. Rules at /label-rules
confidence_labelNoEvidence verdict derived from source type, verification age and the stale flag (answers: the weakest series read). Rules at /label-rules
payment_requiredNotrue when the call needs payment; how_to_pay explains x402 or card

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed8 schema fields changed
    • removedOutput schema / properties / entries / items / properties / label_basis / properties / source_type / anyOf
      Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
    • addedOutput schema / properties / entries / items / properties / label_basis / properties / source_type / type
      Added value: +[
+  "string",
+  "null"
+]
    • removedOutput schema / properties / entries / items / properties / label_basis / properties / verification_age_days / anyOf
      Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
    • addedOutput schema / properties / entries / items / properties / label_basis / properties / verification_age_days / type
      Added value: +[
+  "number",
+  "null"
+]
    • removedOutput schema / properties / label_basis / properties / source_type / anyOf
      Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
    • addedOutput schema / properties / label_basis / properties / source_type / type
      Added value: +[
+  "string",
+  "null"
+]
    • removedOutput schema / properties / label_basis / properties / verification_age_days / anyOf
      Removed value: -[
-  {
-    "type": "number"
-  },
-  {
-    "type": "null"
-  }
-]
    • addedOutput schema / properties / label_basis / properties / verification_age_days / type
      Added value: +[
+  "number",
+  "null"
+]
  2. Changed7 schema fields changed
    • changedOutput schema / description
      Previous value: -"Historical entries of one series"New value: +"Historical entries of one series; top-level labels describe the current value, and each entry carries its own"
    • addedOutput schema / properties / confidence_label
      Added value: +{
+  "description": "Evidence verdict derived from source type, verification age and the stale flag (answers: the weakest series read). Rules at /label-rules",
+  "enum": [
+    "high",
+    "medium",
+    "low"
+  ],
+  "type": "string"
+}
    • addedOutput schema / properties / coverage_label
      Added value: +{
+  "description": "How much of the question is covered: ready = complete; partial = held with a disclosed limitation or default; gap = no number served. Rules at /label-rules",
+  "enum": [
+    "ready",
+    "partial",
+    "gap"
+  ],
+  "type": "string"
+}
    • addedOutput schema / properties / entries / items / additionalProperties
      Added value: +{}
    • addedOutput schema / properties / entries / items / properties
      Added value: +{
+  "confidence": {},
+  "confidence_label": {
+    "description": "Evidence verdict derived from source type, verification age and the stale flag (answers: the weakest series read). Rules at /label-rules",
+    "enum": [
+      "high",
+      "medium",
+      "low"
+    ],
+    "type": "string"
+  },
+  "country": {
+    "type": "string"
+  },
+  "coverage_label": {
+    "description": "How much of the question is covered: ready = complete; partial = held with a disclosed limitation or default; gap = no number served. Rules at /label-rules",
+    "enum": [
+      "ready",
+      "partial",
+      "gap"
+    ],
+    "type": "string"
+  },
+  "effective_from": {},
+  "label_basis": {
+    "additionalProperties": {},
+    "description": "Inputs and the rule ids that produced the two labels",
+    "properties": {
+      "confidence_reasons": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "coverage_reasons": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "inputs": {
+        "items": {},
+        "type": "array"
+      },
+      "rules": {
+        "type": "string"
+      },
+      "rules_version": {
+        "type": "string"
+      },
+      "source_type": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "stale": {
+        "type": "boolean"
+      },
+      "verification_age_days": {
+        "anyOf": [
+          {
+            "type": "number"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "type": "object"
+  },
+  "last_confirmed": {},
+  "notes": {},
+  "series": {
+    "type": "string"
+  },
+  "source": {},
+  "stale": {
+    "type": "boolean"
+  },
+  "unit": {},
+  "value": {}
+}
    • addedOutput schema / properties / entries / items / type
      Added value: +"object"
    • addedOutput schema / properties / label_basis
      Added value: +{
+  "additionalProperties": {},
+  "description": "Inputs and the rule ids that produced the two labels",
+  "properties": {
+    "confidence_reasons": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "coverage_reasons": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "inputs": {
+      "items": {},
+      "type": "array"
+    },
+    "rules": {
+      "type": "string"
+    },
+    "rules_version": {
+      "type": "string"
+    },
+    "source_type": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "stale": {
+      "type": "boolean"
+    },
+    "verification_age_days": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "type": "object"
+}
  3. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": {},
+  "description": "Historical entries of one series",
+  "properties": {
+    "bind_series": {},
+    "country": {
+      "type": "string"
+    },
+    "disclaimer": {},
+    "entries": {
+      "items": {},
+      "type": "array"
+    },
+    "error": {
+      "description": "Present on a free refusal or error; no charge"
+    },
+    "explanation": {},
+    "how_to_pay": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "http_endpoint": {
+      "type": "string"
+    },
+    "no_charge": {
+      "type": "boolean"
+    },
+    "payment_required": {
+      "description": "true when the call needs payment; how_to_pay explains x402 or card",
+      "type": "boolean"
+    },
+    "price_usd": {
+      "type": "number"
+    },
+    "series": {
+      "type": "string"
+    },
+    "stale": {
+      "type": "boolean"
+    },
+    "x_next_bind": {}
+  },
+  "type": "object"
+}
  4. Changed1 schema field changed
    • changedInput schema / properties / country / enum
      Previous value: -[
-  "at",
-  "be",
-  "bg",
-  "ch",
-  "cz",
-  "de",
-  "dk",
-  "ee",
-  "es",
-  "eu",
-  "fi",
-  "fr",
-  "gb",
-  "gr",
-  "hu",
-  "ie",
-  "is",
-  "it",
-  "lt",
-  "lv",
-  "nl",
-  "no",
-  "pl",
-  "pt",
-  "ro",
-  "rs",
-  "se",
-  "tr",
-  "ua"
-]New value: +[
+  "at",
+  "be",
+  "bg",
+  "ch",
+  "cy",
+  "cz",
+  "de",
+  "dk",
+  "ee",
+  "es",
+  "eu",
+  "fi",
+  "fr",
+  "gb",
+  "gr",
+  "hr",
+  "hu",
+  "ie",
+  "is",
+  "it",
+  "lt",
+  "lu",
+  "lv",
+  "mt",
+  "nl",
+  "no",
+  "pl",
+  "pt",
+  "ro",
+  "rs",
+  "se",
+  "si",
+  "sk",
+  "tr",
+  "ua"
+]
  5. Changed1 schema field changed
    • changedInput schema / properties / country / enum
      Previous value: -[
-  "at",
-  "be",
-  "bg",
-  "ch",
-  "cz",
-  "de",
-  "dk",
-  "es",
-  "eu",
-  "fi",
-  "fr",
-  "gb",
-  "gr",
-  "hu",
-  "ie",
-  "is",
-  "it",
-  "nl",
-  "no",
-  "pl",
-  "pt",
-  "ro",
-  "rs",
-  "se",
-  "tr",
-  "ua"
-]New value: +[
+  "at",
+  "be",
+  "bg",
+  "ch",
+  "cz",
+  "de",
+  "dk",
+  "ee",
+  "es",
+  "eu",
+  "fi",
+  "fr",
+  "gb",
+  "gr",
+  "hu",
+  "ie",
+  "is",
+  "it",
+  "lt",
+  "lv",
+  "nl",
+  "no",
+  "pl",
+  "pt",
+  "ro",
+  "rs",
+  "se",
+  "tr",
+  "ua"
+]
  6. Changed1 schema field changed
    • changedInput schema / properties / country / enum
      Previous value: -[
-  "at",
-  "be",
-  "bg",
-  "ch",
-  "cz",
-  "de",
-  "dk",
-  "es",
-  "fi",
-  "fr",
-  "gb",
-  "gr",
-  "hu",
-  "ie",
-  "is",
-  "it",
-  "nl",
-  "no",
-  "pl",
-  "pt",
-  "ro",
-  "rs",
-  "se",
-  "tr",
-  "ua"
-]New value: +[
+  "at",
+  "be",
+  "bg",
+  "ch",
+  "cz",
+  "de",
+  "dk",
+  "es",
+  "eu",
+  "fi",
+  "fr",
+  "gb",
+  "gr",
+  "hu",
+  "ie",
+  "is",
+  "it",
+  "nl",
+  "no",
+  "pl",
+  "pt",
+  "ro",
+  "rs",
+  "se",
+  "tr",
+  "ua"
+]
  7. Changed1 schema field changed
    • changedInput schema / properties / country / enum
      Previous value: -[
-  "at",
-  "be",
-  "ch",
-  "cz",
-  "de",
-  "dk",
-  "es",
-  "fi",
-  "fr",
-  "gb",
-  "gr",
-  "hu",
-  "ie",
-  "it",
-  "nl",
-  "no",
-  "pl",
-  "pt",
-  "ro",
-  "rs",
-  "se",
-  "tr"
-]New value: +[
+  "at",
+  "be",
+  "bg",
+  "ch",
+  "cz",
+  "de",
+  "dk",
+  "es",
+  "fi",
+  "fr",
+  "gb",
+  "gr",
+  "hu",
+  "ie",
+  "is",
+  "it",
+  "nl",
+  "no",
+  "pl",
+  "pt",
+  "ro",
+  "rs",
+  "se",
+  "tr",
+  "ua"
+]
  8. Changed1 schema field changed
    • changedInput schema / properties / country / enum
      Previous value: -[
-  "at",
-  "be",
-  "ch",
-  "cz",
-  "de",
-  "dk",
-  "es",
-  "fi",
-  "fr",
-  "gb",
-  "gr",
-  "hu",
-  "ie",
-  "it",
-  "nl",
-  "no",
-  "pl",
-  "pt",
-  "ro",
-  "se",
-  "tr"
-]New value: +[
+  "at",
+  "be",
+  "ch",
+  "cz",
+  "de",
+  "dk",
+  "es",
+  "fi",
+  "fr",
+  "gb",
+  "gr",
+  "hu",
+  "ie",
+  "it",
+  "nl",
+  "no",
+  "pl",
+  "pt",
+  "ro",
+  "rs",
+  "se",
+  "tr"
+]
  9. Changed1 schema field changed
    • changedInput schema / properties / country / enum
      Previous value: -[
-  "at",
-  "be",
-  "de",
-  "dk",
-  "es",
-  "fr",
-  "gb",
-  "ie",
-  "it",
-  "nl",
-  "pl",
-  "se"
-]New value: +[
+  "at",
+  "be",
+  "ch",
+  "cz",
+  "de",
+  "dk",
+  "es",
+  "fi",
+  "fr",
+  "gb",
+  "gr",
+  "hu",
+  "ie",
+  "it",
+  "nl",
+  "no",
+  "pl",
+  "pt",
+  "ro",
+  "se",
+  "tr"
+]
  10. Changed1 schema field changed
    • changedInput schema / properties / country / enum
      Previous value: -[
-  "de",
-  "es",
-  "fr",
-  "gb",
-  "it",
-  "nl"
-]New value: +[
+  "at",
+  "be",
+  "de",
+  "dk",
+  "es",
+  "fr",
+  "gb",
+  "ie",
+  "it",
+  "nl",
+  "pl",
+  "se"
+]
  11. First observed

TDQS

A3.7/5.0
Behavior4/5

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

Annotations already declare readOnly, idempotent and non-destructive, so the description is free to spend its words on things annotations cannot express: the $0.003 price, the two payment paths (api_key vs x402), the free DE trial, and the warning that unbound values can be silently retired by a later gazette. That is substantive operational context rather than restatement.

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?

The price and paid status are front-loaded, followed by purpose and then follow-up routing, so an agent can triage quickly. It is dense and slightly cluttered by pricing fragments ('Register: $0 · Delivery after trial: $0.05'), but no sentence is pure filler.

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?

With an output schema present, return values need no explanation, and the description covers the gaps that matter for a paid, multi-country, date-ranged tool: cost, auth/payment path, free tier and recommended follow-up calls. Only failure/error behavior is left to inference, which is a minor omission.

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%, so all five parameters are already documented with types, formats and a country enum. The description only echoes the YYYY-MM-DD date format and the api_key option, adding essentially nothing beyond the schema; baseline 3 applies.

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 and resource ('Historical values of a reference series with effective date ranges') and the optional from/to scoping, so the agent knows it returns a dated value history rather than a snapshot. It does not explicitly contrast itself with close siblings like get_series or get_snapshot, which keeps it short of a 5.

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?

Gives real invocation context (pass api_key, otherwise the response explains x402 payment, DE series are free to try) and routes the agent to follow-up tools (get_changes, register_alert). However it never says when to prefer this over get_series/get_snapshot, so the when-to-use selection guidance is only implied.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

All euroref — European government reference data toolsInspect
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