Bankstatemently

Group Transactions

group_by

Read-only

Group transactions by a dimension (month/category/merchant/account/currency) and apply a metric to each group. Results are per-currency. Scope defaults to all your completed statements; pass "scope" to narrow to specific accounts/products and/or a date range.

Input Schema

TableJSON Schema

Name	Required	Description
`scope`	No	Optional structural scope (WHO × WHEN). Omit to search across all your completed statements. "accounts" is a list of account/product chips (kind + identityKey); "dateRange" bounds by transaction date (YYYY-MM-DD).
`filter`	No	Subset of transactions to operate on. All fields are optional and combined with AND logic.
`metric`	Yes	Metric per group.
`dimension`	Yes	Grouping dimension.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`scope`	Yes
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedSep 10, 2026

addedOutput schema / $defs

Added value: +{
+  "__schema0": {
+    "anyOf": [
+      {
+        "type": "string"
+      },
+      {
+        "type": "number"
+      },
+      {
+        "type": "boolean"
+      },
+      {
+        "type": "null"
+      },
+      {
+        "items": {
+          "$ref": "#/$defs/__schema0"
+        },
+        "type": "array"
+      },
+      {
+        "additionalProperties": {
+          "$ref": "#/$defs/__schema0"
+        },
+        "propertyNames": {
+          "type": "string"
+        },
+        "type": "object"
+      }
+    ]
+  }
+}

changedOutput schema / properties / result / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "properties": {},
-    "type": "object"
-  },
-  {
-    "items": {
-      "additionalProperties": {},
-      "properties": {},
-      "type": "object"
-    },
-    "type": "array"
-  }
-]New value: +[
+  {
+    "additionalProperties": {
+      "$ref": "#/$defs/__schema0"
+    },
+    "propertyNames": {
+      "type": "string"
+    },
+    "type": "object"
+  },
+  {
+    "items": {
+      "additionalProperties": {
+        "$ref": "#/$defs/__schema0"
+      },
+      "propertyNames": {
+        "type": "string"
+      },
+      "type": "object"
+    },
+    "type": "array"
+  }
+]

changedOutput schema / properties / scope / additionalProperties
```
Previous value: -{}New value: +false
```

Changed22 schema fields changedSep 4, 2026

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

addedInput schema / properties / dimension / description
```
Added value: +"Grouping dimension."
```

addedInput schema / properties / filter / description

Added value: +"Subset of transactions to operate on. All fields are optional and combined with AND logic."

addedInput schema / properties / filter / properties / accounts / description
```
Added value: +"Account number slugs to include."
```
addedInput schema / properties / filter / properties / amountMax / description
```
Added value: +"Inclusive maximum absolute amount."
```
addedInput schema / properties / filter / properties / amountMin / description
```
Added value: +"Inclusive minimum absolute amount."
```

addedInput schema / properties / filter / properties / category / description

Added value: +"Category slug, e.g. \"meals_entertainment\", \"groceries_personal\"."

addedInput schema / properties / filter / properties / currency / description
```
Added value: +"ISO 4217 currency code. E.g. \"USD\", \"HKD\"."
```
addedInput schema / properties / filter / properties / dateEnd / description
```
Added value: +"ISO date (YYYY-MM-DD). Inclusive upper bound."
```
addedInput schema / properties / filter / properties / dateStart / description
```
Added value: +"ISO date (YYYY-MM-DD). Inclusive lower bound."
```
addedInput schema / properties / filter / properties / direction / description
```
Added value: +"Semantic direction."
```

addedInput schema / properties / filter / properties / merchant / description

Added value: +"Substring match against description or counterparty (case-insensitive)."

addedInput schema / properties / filter / properties / text / description

Added value: +"Whole-row text search over raw transaction fields (case-insensitive)."

addedInput schema / properties / metric / description
```
Added value: +"Metric per group."
```

addedInput schema / properties / scope / description

Added value: +"Optional structural scope (WHO × WHEN). Omit to search across all your completed statements. \"accounts\" is a list of account/product chips (kind + identityKey); \"dateRange\" bounds by transaction date (YYYY-MM-DD)."

addedInput schema / properties / scope / properties / accounts / description

Added value: +"Account/product chips (kind + identityKey) to scope to. Empty = all accounts."

removedInput schema / properties / scope / properties / accounts / items / anyOf

Removed value: -[
-  {
-    "properties": {
-      "anchorContentHash": {
-        "type": "string"
-      },
-      "identityKey": {
-        "minLength": 1,
-        "type": "string"
-      },
-      "kind": {
-        "const": "account",
-        "type": "string"
-      },
-      "label": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind",
-      "identityKey"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "identityKey": {
-        "minLength": 1,
-        "type": "string"
-      },
-      "kind": {
-        "const": "product",
-        "type": "string"
-      },
-      "label": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind",
-      "identityKey"
-    ],
-    "type": "object"
-  }
-]

addedInput schema / properties / scope / properties / accounts / items / oneOf

Added value: +[
+  {
+    "properties": {
+      "anchorContentHash": {
+        "description": "Document-anchored lookup when present (results page); omit for a user-scoped lookup (workspace surfaces).",
+        "type": "string"
+      },
+      "identityKey": {
+        "description": "Canonical account identity key (accountIdentityKey), never a raw DB UUID.",
+        "minLength": 1,
+        "type": "string"
+      },
+      "kind": {
+        "const": "account",
+        "description": "This chip addresses a single account.",
+        "type": "string"
+      },
+      "label": {
+        "description": "Display label for this chip.",
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "identityKey"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "identityKey": {
+        "description": "Product slug.",
+        "minLength": 1,
+        "type": "string"
+      },
+      "kind": {
+        "const": "product",
+        "description": "This chip addresses a product and expands to its child accounts.",
+        "type": "string"
+      },
+      "label": {
+        "description": "Display label for this chip.",
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "identityKey"
+    ],
+    "type": "object"
+  }
+]

addedInput schema / properties / scope / properties / dateRange / description

Added value: +"Bounds results to transactions within this date range. Omit for no date filter."

addedInput schema / properties / scope / properties / dateRange / properties / from / description
```
Added value: +"Start of the date range (inclusive), YYYY-MM-DD."
```
addedInput schema / properties / scope / properties / dateRange / properties / to / description
```
Added value: +"End of the date range (inclusive), YYYY-MM-DD."
```

changedOutput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

Changed20 schema fields changedAug 21, 2026

removedInput schema / properties / dimension / description
```
Removed value: -"Grouping dimension."
```

removedInput schema / properties / filter / description

Removed value: -"Subset of transactions to operate on. All fields are optional and combined with AND logic."

removedInput schema / properties / filter / properties / accounts / description
```
Removed value: -"Account number slugs to include."
```
removedInput schema / properties / filter / properties / amountMax / description
```
Removed value: -"Inclusive maximum absolute amount."
```
removedInput schema / properties / filter / properties / amountMin / description
```
Removed value: -"Inclusive minimum absolute amount."
```

removedInput schema / properties / filter / properties / category / description

Removed value: -"Category slug, e.g. \"meals_entertainment\", \"groceries_personal\"."

removedInput schema / properties / filter / properties / currency / description
```
Removed value: -"ISO 4217 currency code. E.g. \"USD\", \"HKD\"."
```
removedInput schema / properties / filter / properties / dateEnd / description
```
Removed value: -"ISO date (YYYY-MM-DD). Inclusive upper bound."
```
removedInput schema / properties / filter / properties / dateStart / description
```
Removed value: -"ISO date (YYYY-MM-DD). Inclusive lower bound."
```
removedInput schema / properties / filter / properties / direction / description
```
Removed value: -"Semantic direction."
```

removedInput schema / properties / filter / properties / merchant / description

Removed value: -"Substring match against description or counterparty (case-insensitive)."

removedInput schema / properties / filter / properties / text / description

Removed value: -"Whole-row text search over raw transaction fields (case-insensitive)."

removedInput schema / properties / metric / description
```
Removed value: -"Metric per group."
```

removedInput schema / properties / scope / description

Removed value: -"Optional structural scope (WHO × WHEN). Omit to search across all your completed statements. \"accounts\" is a list of account/product chips (kind + identityKey); \"dateRange\" bounds by transaction date (YYYY-MM-DD)."

removedInput schema / properties / scope / properties / accounts / description

Removed value: -"Account/product chips (kind + identityKey) to scope to. Empty = all accounts."

addedInput schema / properties / scope / properties / accounts / items / anyOf

Added value: +[
+  {
+    "properties": {
+      "anchorContentHash": {
+        "type": "string"
+      },
+      "identityKey": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "kind": {
+        "const": "account",
+        "type": "string"
+      },
+      "label": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "identityKey"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "identityKey": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "kind": {
+        "const": "product",
+        "type": "string"
+      },
+      "label": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "kind",
+      "identityKey"
+    ],
+    "type": "object"
+  }
+]

removedInput schema / properties / scope / properties / accounts / items / oneOf

Removed value: -[
-  {
-    "properties": {
-      "anchorContentHash": {
-        "description": "Document-anchored lookup when present (results page); omit for a user-scoped lookup (workspace surfaces).",
-        "type": "string"
-      },
-      "identityKey": {
-        "description": "Canonical account identity key (accountIdentityKey), never a raw DB UUID.",
-        "minLength": 1,
-        "type": "string"
-      },
-      "kind": {
-        "const": "account",
-        "description": "This chip addresses a single account.",
-        "type": "string"
-      },
-      "label": {
-        "description": "Display label for this chip.",
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind",
-      "identityKey"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "identityKey": {
-        "description": "Product slug.",
-        "minLength": 1,
-        "type": "string"
-      },
-      "kind": {
-        "const": "product",
-        "description": "This chip addresses a product and expands to its child accounts.",
-        "type": "string"
-      },
-      "label": {
-        "description": "Display label for this chip.",
-        "type": "string"
-      }
-    },
-    "required": [
-      "kind",
-      "identityKey"
-    ],
-    "type": "object"
-  }
-]

removedInput schema / properties / scope / properties / dateRange / description

Removed value: -"Bounds results to transactions within this date range. Omit for no date filter."

removedInput schema / properties / scope / properties / dateRange / properties / from / description
```
Removed value: -"Start of the date range (inclusive), YYYY-MM-DD."
```
removedInput schema / properties / scope / properties / dateRange / properties / to / description
```
Removed value: -"End of the date range (inclusive), YYYY-MM-DD."
```

First observedAug 12, 2026

TDQS

A4.3/5.0

Behavior4/5

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

Annotations already declare readOnlyHint=true and destructiveHint=false, covering the safety profile. The description adds behavioral details beyond annotations: results are per-currency and the scope defaults to all completed statements. No contradiction with annotations.

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 sentences with strong front-loading: the first sentence states the core function (grouping and metrics), the second covers scope and default behavior. No wasted words or redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the rich schema (100% coverage) and the presence of an output schema, the description sufficiently explains the tool's behavior. It covers default scope, per-currency results, and the scope parameter, leaving no critical gaps for an agent to call it correctly.

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 100%, so all parameters are fully documented. The description adds minimal extra meaning—it mentions that scope narrows to accounts/products and/or date range, but this is already in the schema. It does not provide additional semantic value beyond 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?

The description states the exact operation: grouping transactions by a dimension (listing all five) and applying a metric (implied list). It also specifies that results are per-currency and the default scope, making the tool's purpose unmistakable and distinct from siblings like top_n or time_series.

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

Usage Guidelines4/5

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

Provides clear context: it groups transactions by dimension with a metric, and explains the default scope (all completed statements) and how to narrow it via the 'scope' parameter. However, it does not explicitly name alternative tools or state when not to use it, so it lacks explicit exclusions.

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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