Payments Law EU

Browse PSR or PSD3 text changes

list_version_changes

Read-onlyIdempotent

Use this to browse which articles changed between the held proposal and Council compromise versions of PSR or PSD3. For one article's wording changes use compare_versions. Across the instrument's two published texts, lists every aligned article with its classification, filterable by status, materiality and article range. The editorial materiality markers travel on every response whatever the filters, because they exist precisely where the mechanical classification does not show what matters — 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

TableJSON 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 carrying an editorial materiality marker.
`to_version_id`	No
`from_version_id`	No	Optional; where given, must name the published pair.

Output Schema

TableJSON 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.

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 cover the safety profile (readOnlyHint=true, idempotentHint=true), and the description adds non-obvious response behavior: 'editorial materiality markers travel on every response whatever the filters,' with a rationale for their existence. It also discloses that 'classifications are mechanical' and that the response states its basis, tempering expectations about classification reliability. This is meaningful context beyond the structured annotations.

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 core purpose is front-loaded in the first sentence, with sibling routing in the second. The materiality-marker explanation is lengthy but earns its place by disclosing non-obvious response behavior; the clause about 'a re-scoped defined term changes articles whose text did not change at all' is somewhat convoluted but substantively valuable. Every sentence has a job.

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 an 8-parameter tool with complex version-pair semantics and a nuanced classification concept, the description covers purpose, filters, response behavior, and classification reliability. An output schema exists, so return values need no description. The remaining gaps — pagination behavior and instrument_id format — are left to schema names and convention, which is acceptable at this complexity.

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 covers 4 of 8 parameters (status, articles, material_only, from_version_id) for 50% coverage. The description partially compensates by naming the filter dimensions ('status, materiality and article range') and framing the version pair as 'the instrument's two published texts,' but limit, cursor, to_version_id, and instrument_id gain no added semantics. The compensation is partial, so the score sits at baseline.

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 opens with a specific verb ('browse') and resource ('articles changed between the held proposal and Council compromise versions of PSR or PSD3'), naming the instrument scope explicitly. It differentiates from its closest sibling: 'For one article's wording changes use compare_versions.' No ambiguity remains about what this tool is for.

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 states the primary use case ('browse which articles changed between the held proposal and Council compromise versions') and routes to the alternative with a clear condition ('For one article's wording changes use compare_versions'). The mention of filters ('status, materiality and article range') further tells the agent when this tool is the right choice.

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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