Vaquill

Act Amendment History

get_act_amendments

Read-only

The amendment history recorded against one enactment: substitutions, insertions and omissions, each with the amending Act and its effective date (e.g. 'Subs. by Act 22 of 2023, s. 44 (w.e.f. 13-11-2025)'). Use to check whether a provision still reads as enacted before relying on its text. An empty list means no amendment was recorded, NOT that the Act was never amended. Cost: 5 credits.

Input Schema

TableJSON Schema

Name	Required	Description
`page`	No	1-based page number.
`type`	No	Action classes are returned in nominal form, but filters accept both nominal and stored verbal spellings. For example, `substitution` and `substituted` are both accepted.
`act_id`	Yes	Section identifier, e.g. `USC_T42_C21_S1983` (Title 42, Chapter 21, Section 1983, written 42 U.S.C. 1983). Take it from a search result rather than assembling it: the title and section are derivable from a citation but the CHAPTER is not, so hand-built ids usually 404.
`section`	No	Keep only footnotes attached to this section, written exactly as the publisher does. Alphanumeric suffixes are part of the number, not a sub-provision: `498A` is one section, not section 498 clause A.
`pageSize`	No	Results per page (1-200).

Output Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedOct 10, 2026

changedInput schema / properties / type / anyOf

Previous value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "enum": [
+      "substitution",
+      "insertion",
+      "omission",
+      "renumbering",
+      "addition",
+      "repeal",
+      "deletion",
+      "adaptation",
+      "amendment",
+      "note"
+    ],
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

removedInput schema / properties / type / enum

Removed value: -[
-  "substitution",
-  "insertion",
-  "omission",
-  "renumbering",
-  "addition",
-  "repeal",
-  "deletion",
-  "adaptation",
-  "amendment",
-  "note"
-]

Changed1 schema field changedOct 1, 2026
- changedInput schema / properties / act_id / pattern
```
Previous value: -"^[a-zA-Z0-9_-]+$"New value: +"^[^/\\\\\\x00-\\x1f]+$"
```

Changed1 schema field changedSep 29, 2026

changedInput schema / properties / type / description

Previous value: -"Amendment action class. Served in the NOMINAL spelling; the corpus stores the verbal form (`substituted`) and either is accepted. Values: `substitution`, `insertion`, `omission`, `renumbering`, `addition`, `repeal`, `deletion`, `adaptation`, `amendment`, `note`."New value: +"Action classes are returned in nominal form, but filters accept both nominal and stored verbal spellings. For example, `substitution` and `substituted` are both accepted."

Changed9 schema fields changedSep 14, 2026

addedInput schema / properties / act_id / examples
```
Added value: +[
+  "IND_state_20326"
+]
```

changedInput schema / properties / page / description

Previous value: -"Page number"New value: +"1-based page number."

addedInput schema / properties / page / examples
```
Added value: +[
+  1
+]
```

changedInput schema / properties / pageSize / description

Previous value: -"Results per page"New value: +"Results per page (1-200)."

addedInput schema / properties / pageSize / examples
```
Added value: +[
+  100
+]
```

changedInput schema / properties / section / anyOf

Previous value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "maxLength": 40,
+    "pattern": "^[A-Za-z0-9().\\- ]{1,40}$",
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

changedInput schema / properties / section / description

Previous value: -"Filter by section number"New value: +"Keep only footnotes attached to this section, written exactly as the publisher does. Alphanumeric suffixes are part of the number, not a sub-provision: `498A` is one section, not section 498 clause A."

addedInput schema / properties / section / examples
```
Added value: +[
+  "23"
+]
```

changedInput schema / properties / type / description

Previous value: -"Amendment action class. Served in the NOMINAL spelling; the corpus stores the verbal form (`substituted`) and either is accepted."New value: +"Amendment action class. Served in the NOMINAL spelling; the corpus stores the verbal form (`substituted`) and either is accepted. Values: `substitution`, `insertion`, `omission`, `renumbering`, `addition`, `repeal`, `deletion`, `adaptation`, `amendment`, `note`."

Changed3 schema fields changedSep 7, 2026

changedInput schema / properties / type / description

Previous value: -"Filter: substitution, insertion, omission, note, renumbering"New value: +"Amendment action class. Served in the NOMINAL spelling; the corpus stores the verbal form (`substituted`) and either is accepted."

addedInput schema / properties / type / enum

Added value: +[
+  "substitution",
+  "insertion",
+  "omission",
+  "renumbering",
+  "addition",
+  "repeal",
+  "deletion",
+  "adaptation",
+  "amendment",
+  "note"
+]