Payments Law — EU payments legislation

Browse PSR or PSD3 text changes

list_version_changes

Read-onlyIdempotent

Use this to browse which articles changed between the Commission proposal and the Council compromise text of PSR or PSD3; no comparison with a text published in the Official Journal is held. For one article's wording changes use compare_versions. Across those two texts, lists every aligned article with its classification, filterable by status, editor's note and article range. Editor's notes travel on every response whatever the filters, because they record what the mechanical classification cannot show: a re-scoped defined term changes articles whose text did not change at all. Classifications are mechanical, and the response says on what basis.

Input Schema

Name	Required	Description
`limit`	No
`cursor`	No
`status`	No	One of the classification statuses, e.g. "amended_substantial".
`articles`	No	Article-number range, in legal order.
`instrument_id`	Yes
`material_only`	No	Keep only articles that carry an editor's note.
`to_version_id`	No
`from_version_id`	No	Optional; where given, must name the published pair.

Output Schema

Name	Required	Description	Default
`data`	Yes
`error`	Yes
`coverage`	Yes
`warnings`	Yes
`pagination`	Yes
`provenance`	Yes
`derivations`	Yes
`corpus_release`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 14, 2026

changedInput schema / properties / instrument_id / pattern

Previous value: -"^[a-z0-9]+(?:-[a-z0-9]+)*$"New value: +"^[A-Za-z0-9]+(?:[ ._-][A-Za-z0-9]+)*$"

Changed1 schema field changedOct 13, 2026

changedInput schema / properties / material_only / description

Previous value: -"Keep only articles carrying an editorial materiality marker."New value: +"Keep only articles that carry an editor's note."

Changed1 schema field changedOct 10, 2026

changedOutput schema / properties / data / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "properties": {
-      "classification_note": {
-        "type": "string"
-      },
-      "counts": {
-        "additionalProperties": {
-          "type": "number"
-        },
-        "propertyNames": {
-          "type": "string"
-        },
-        "type": "object"
-      },
-      "definition_markers": {
-        "items": {
-          "additionalProperties": {},
-          "properties": {
-            "term": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "term"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "instrument_id": {
-        "type": "string"
-      },
-      "items": {
-        "items": {
-          "additionalProperties": {},
-          "properties": {
-            "article": {
-              "type": "string"
-            },
-            "status": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "article",
-            "status"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "materiality_markers": {
-        "items": {
-          "additionalProperties": {},
-          "properties": {
-            "article": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "article"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "next_cursor": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "pair": {
-        "additionalProperties": {},
-        "properties": {
-          "from": {
-            "additionalProperties": {},
-            "properties": {
-              "version_id": {
-                "type": "string"
-              }
-            },
-            "required": [
-              "version_id"
-            ],
-            "type": "object"
-          },
-          "to": {
-            "additionalProperties": {},
-            "properties": {
-              "version_id": {
-                "type": "string"
-              }
-            },
-            "required": [
-              "version_id"
-            ],
-            "type": "object"
-          }
-        },
-        "required": [
-          "from",
-          "to"
-        ],
-        "type": "object"
-      },
-      "total": {
-        "type": "number"
-      }
-    },
-    "required": [
-      "instrument_id",
-      "pair",
-      "items",
-      "next_cursor",
-      "total",
-      "counts",
-      "materiality_markers",
-      "definition_markers",
-      "classification_note"
-    ],
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "classification_note": {
+        "type": "string"
+      },
+      "counts": {
+        "additionalProperties": {
+          "type": "number"
+        },
+        "propertyNames": {
+          "type": "string"
+        },
+        "type": "object"
+      },
+      "definition_markers": {
+        "items": {
+          "additionalProperties": {},
+          "properties": {
+            "term": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "term"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "explorer_url": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "instrument_id": {
+        "type": "string"
+      },
+      "items": {
+        "items": {
+          "additionalProperties": {},
+          "properties": {
+            "article": {
+              "type": "string"
+            },
+            "status": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "article",
+            "status"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "materiality_markers": {
+        "items": {
+          "additionalProperties": {},
+          "properties": {
+            "article": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "article"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "next_cursor": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "pair": {
+        "additionalProperties": {},
+        "properties": {
+          "from": {
+            "additionalProperties": {},
+            "properties": {
+              "version_id": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "version_id"
+            ],
+            "type": "object"
+          },
+          "to": {
+            "additionalProperties": {},
+            "properties": {
+              "version_id": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "version_id"
+            ],
+            "type": "object"
+          }
+        },
+        "required": [
+          "from",
+          "to"
+        ],
+        "type": "object"
+      },
+      "total": {
+        "type": "number"
+      }
+    },
+    "required": [
+      "instrument_id",
+      "pair",
+      "items",
+      "next_cursor",
+      "total",
+      "counts",
+      "materiality_markers",
+      "definition_markers",
+      "classification_note",
+      "explorer_url"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

Changed11 schema fields changedOct 4, 2026

changedInput schema / properties / articles / anyOf

Previous value: -[
-  {
-    "properties": {
-      "from": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "to": {
-        "type": [
-          "string",
-          "null"
-        ]
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "properties": {
+      "from": {
+        "anyOf": [
+          {
+            "maxLength": 32,
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "to": {
+        "anyOf": [
+          {
+            "maxLength": 32,
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

addedInput schema / properties / cursor / anyOf

Added value: +[
+  {
+    "maxLength": 512,
+    "pattern": "^[A-Za-z0-9_-]+$",
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

removedInput schema / properties / cursor / type
```
Removed value: -[
-  "string",
-  "null"
-]
```

addedInput schema / properties / from_version_id / anyOf

Added value: +[
+  {
+    "maxLength": 64,
+    "pattern": "^[A-Za-z0-9]+(?:-[A-Za-z0-9]+)*$",
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

removedInput schema / properties / from_version_id / type
```
Removed value: -[
-  "string",
-  "null"
-]
```
addedInput schema / properties / instrument_id / maxLength
```
Added value: +64
```
addedInput schema / properties / instrument_id / pattern
```
Added value: +"^[a-z0-9]+(?:-[a-z0-9]+)*$"
```

addedInput schema / properties / status / anyOf

Added value: +[
+  {
+    "maxLength": 64,
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

removedInput schema / properties / status / type
```
Removed value: -[
-  "string",
-  "null"
-]
```

addedInput schema / properties / to_version_id / anyOf

Added value: +[
+  {
+    "maxLength": 64,
+    "pattern": "^[A-Za-z0-9]+(?:-[A-Za-z0-9]+)*$",
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

removedInput schema / properties / to_version_id / type
```
Removed value: -[
-  "string",
-  "null"
-]
```

Changed13 schema fields changedSep 20, 2026

changedInput schema / properties / articles / anyOf

Previous value: -[
-  {
-    "properties": {
-      "from": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "to": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "properties": {
+      "from": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "to": {
+        "type": [
+          "string",
+          "null"
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

removedInput schema / properties / cursor / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / cursor / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedInput schema / properties / from_version_id / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / from_version_id / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedInput schema / properties / material_only / anyOf

Removed value: -[
-  {
-    "type": "boolean"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / material_only / type
```
Added value: +[
+  "boolean",
+  "null"
+]
```

removedInput schema / properties / status / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / status / type
```
Added value: +[
+  "string",
+  "null"
+]
```

removedInput schema / properties / to_version_id / anyOf

Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]

addedInput schema / properties / to_version_id / type
```
Added value: +[
+  "string",
+  "null"
+]
```

changedOutput schema / properties / data / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "properties": {
-      "classification_note": {
-        "type": "string"
-      },
-      "counts": {
-        "additionalProperties": {
-          "type": "number"
-        },
-        "propertyNames": {
-          "type": "string"
-        },
-        "type": "object"
-      },
-      "definition_markers": {
-        "items": {
-          "additionalProperties": {},
-          "properties": {
-            "term": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "term"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "instrument_id": {
-        "type": "string"
-      },
-      "items": {
-        "items": {
-          "additionalProperties": {},
-          "properties": {
-            "article": {
-              "type": "string"
-            },
-            "status": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "article",
-            "status"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "materiality_markers": {
-        "items": {
-          "additionalProperties": {},
-          "properties": {
-            "article": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "article"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "next_cursor": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "pair": {
-        "additionalProperties": {},
-        "properties": {
-          "from": {
-            "additionalProperties": {},
-            "properties": {
-              "version_id": {
-                "type": "string"
-              }
-            },
-            "required": [
-              "version_id"
-            ],
-            "type": "object"
-          },
-          "to": {
-            "additionalProperties": {},
-            "properties": {
-              "version_id": {
-                "type": "string"
-              }
-            },
-            "required": [
-              "version_id"
-            ],
-            "type": "object"
-          }
-        },
-        "required": [
-          "from",
-          "to"
-        ],
-        "type": "object"
-      },
-      "total": {
-        "type": "number"
-      }
-    },
-    "required": [
-      "instrument_id",
-      "pair",
-      "items",
-      "next_cursor",
-      "total",
-      "counts",
-      "materiality_markers",
-      "definition_markers",
-      "classification_note"
-    ],
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "classification_note": {
+        "type": "string"
+      },
+      "counts": {
+        "additionalProperties": {
+          "type": "number"
+        },
+        "propertyNames": {
+          "type": "string"
+        },
+        "type": "object"
+      },
+      "definition_markers": {
+        "items": {
+          "additionalProperties": {},
+          "properties": {
+            "term": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "term"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "instrument_id": {
+        "type": "string"
+      },
+      "items": {
+        "items": {
+          "additionalProperties": {},
+          "properties": {
+            "article": {
+              "type": "string"
+            },
+            "status": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "article",
+            "status"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "materiality_markers": {
+        "items": {
+          "additionalProperties": {},
+          "properties": {
+            "article": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "article"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "next_cursor": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "pair": {
+        "additionalProperties": {},
+        "properties": {
+          "from": {
+            "additionalProperties": {},
+            "properties": {
+              "version_id": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "version_id"
+            ],
+            "type": "object"
+          },
+          "to": {
+            "additionalProperties": {},
+            "properties": {
+              "version_id": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "version_id"
+            ],
+            "type": "object"
+          }
+        },
+        "required": [
+          "from",
+          "to"
+        ],
+        "type": "object"
+      },
+      "total": {
+        "type": "number"
+      }
+    },
+    "required": [
+      "instrument_id",
+      "pair",
+      "items",
+      "next_cursor",
+      "total",
+      "counts",
+      "materiality_markers",
+      "definition_markers",
+      "classification_note"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

changedOutput schema / properties / pagination / anyOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "complete": {
-        "type": "boolean"
-      },
-      "next_cursor": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "total": {
-        "type": "number"
-      }
-    },
-    "required": [
-      "complete",
-      "next_cursor"
-    ],
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "complete": {
+        "type": "boolean"
+      },
+      "next_cursor": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "total": {
+        "type": "number"
+      }
+    },
+    "required": [
+      "complete",
+      "next_cursor"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

First observedSep 6, 2026

TDQS

A4.3/5.0

Behavior4/5

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

Annotations already declare readOnly/idempotent/non-destructive, so the safety bar is covered. The description adds genuinely useful behavioral detail beyond that: editor's notes travel on every response regardless of filters, and classifications are mechanical with the basis stated in the response. It stops short of describing pagination behavior.

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?

Front-loads the 'use this to...' purpose, then the routing rule, then filter behavior. Efficient overall, though the editor's-notes rationale sentence is dense and slightly buries its point.

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 scope, routing and the notable response behavior. The main omission is any hint about pagination or version-id expectations, but for a read-only browse tool this is minor.

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 description coverage is 50% with 8 params. The description maps the stated filters (status, editor's note, article range) to status, material_only and articles, adding useful framing, but leaves limit, cursor, instrument_id and the from/to version ids entirely to the schema.

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 ('browse which articles changed between... PSR or PSD3') with an explicit scope boundary (Commission proposal vs Council compromise, no Official Journal comparison). It clearly distinguishes itself from sibling compare_versions.

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

Usage Guidelines5/5

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

Explicitly routes the agent: 'For one article's wording changes use compare_versions', naming the alternative and the condition that selects it. It also states when-not ('no comparison with a text published in the Official Journal is held'), leaving nothing to inference.

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

All Payments Law — EU payments legislation tools Inspect

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