ExpenseBot

get_subscription_audit

Read-only

Subscription audit — wraps the Subscription Auditor engine to find recurring charges, duplicates, price increases, and trial-conversion suspects in the user's expenses. Examples: 'recurring subscriptions', 'duplicate subscriptions', 'price increases', 'trial conversions', 'subscriptions over $20/month'. Returns: { message, data: { recurring, duplicates, priceIncreases, trialConversions, totalMonthlyCost, sampleMeta? } }.

Input Schema

Name	Required	Description
`focus`	No	Narrow the audit to a single category (default: all)
`query`	No	Natural language subscription question (e.g., 'find duplicate subscriptions', 'price increases this year')
`dateRange`	No	Time period filter; use exactly one variant matching the user's phrasing.

Output Schema

Name	Required	Description
`data`	No
`message`	No
`success`	No	Present only on the error branch (out of scope) / async path.

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedOct 27, 2026

changedInput schema / properties / dateRange / description

Previous value: -"Time period filter. Use exactly one variant — pick the shape that matches the user's phrasing."New value: +"Time period filter; use exactly one variant matching the user's phrasing."

changedInput schema / properties / dateRange / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "month": {
-        "description": "Month name or 1-12 (e.g., 'March' or '3')",
-        "type": "string"
-      },
-      "type": {
-        "const": "month",
-        "type": "string"
-      },
-      "year": {
-        "description": "4-digit year (e.g., 2026)",
-        "type": "integer"
-      }
-    },
-    "required": [
-      "type",
-      "month",
-      "year"
-    ],
-    "title": "Specific month",
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "quarter": {
-        "maximum": 4,
-        "minimum": 1,
-        "type": "integer"
-      },
-      "type": {
-        "const": "quarter",
-        "type": "string"
-      },
-      "year": {
-        "type": "integer"
-      }
-    },
-    "required": [
-      "type",
-      "quarter",
-      "year"
-    ],
-    "title": "Quarter of a year",
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "type": {
-        "const": "year",
-        "type": "string"
-      },
-      "year": {
-        "type": "integer"
-      }
-    },
-    "required": [
-      "type",
-      "year"
-    ],
-    "title": "Full year",
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "end": {
-        "description": "ISO date YYYY-MM-DD (inclusive)",
-        "format": "date",
-        "type": "string"
-      },
-      "start": {
-        "description": "ISO date YYYY-MM-DD (inclusive)",
-        "format": "date",
-        "type": "string"
-      },
-      "type": {
-        "const": "specific",
-        "type": "string"
-      }
-    },
-    "required": [
-      "type",
-      "start",
-      "end"
-    ],
-    "title": "Specific date range",
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "type": {
-        "const": "relative",
-        "type": "string"
-      },
-      "value": {
-        "description": "Relative range phrase, e.g., 'last month', 'YTD', 'this quarter', 'last 7 days'",
-        "type": "string"
-      }
-    },
-    "required": [
-      "type",
-      "value"
-    ],
-    "title": "Relative natural-language range",
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "month": {
+        "description": "Month name or 1-12 (e.g., 'March' or '3')",
+        "type": "string"
+      },
+      "type": {
+        "const": "month",
+        "type": "string"
+      },
+      "year": {
+        "description": "4-digit year (e.g., 2026)",
+        "type": "integer"
+      }
+    },
+    "required": [
+      "type",
+      "month",
+      "year"
+    ],
+    "title": "Specific month",
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "quarter": {
+        "maximum": 4,
+        "minimum": 1,
+        "type": "integer"
+      },
+      "type": {
+        "const": "quarter",
+        "type": "string"
+      },
+      "year": {
+        "type": "integer"
+      }
+    },
+    "required": [
+      "type",
+      "quarter",
+      "year"
+    ],
+    "title": "Quarter of a year",
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "type": {
+        "const": "year",
+        "type": "string"
+      },
+      "year": {
+        "type": "integer"
+      }
+    },
+    "required": [
+      "type",
+      "year"
+    ],
+    "title": "Full year",
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "end": {
+        "description": "ISO date YYYY-MM-DD (inclusive)",
+        "format": "date",
+        "type": "string"
+      },
+      "start": {
+        "description": "ISO date YYYY-MM-DD (inclusive)",
+        "format": "date",
+        "type": "string"
+      },
+      "type": {
+        "const": "specific",
+        "type": "string"
+      }
+    },
+    "required": [
+      "type",
+      "start",
+      "end"
+    ],
+    "title": "Specific date range",
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "type": {
+        "const": "relative",
+        "type": "string"
+      },
+      "value": {
+        "description": "Relative phrase, e.g. 'last month', 'YTD', 'last 7 days'",
+        "type": "string"
+      }
+    },
+    "required": [
+      "type",
+      "value"
+    ],
+    "title": "Relative natural-language range",
+    "type": "object"
+  }
+]

changedOutput schema / description

Previous value: -"Success returns message + data with the computed summary; success is not emitted on the inline analytics path."New value: +"Returns message + data; no success flag on the inline path."

Changed1 schema field changedSep 9, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "description": "Success returns message + data with the computed summary; success is not emitted on the inline analytics path.",
+  "properties": {
+    "data": {
+      "additionalProperties": true,
+      "type": [
+        "object",
+        "null"
+      ]
+    },
+    "message": {
+      "type": "string"
+    },
+    "success": {
+      "description": "Present only on the error branch (out of scope) / async path.",
+      "type": "boolean"
+    }
+  },
+  "required": [],
+  "type": "object"
+}

Changed1 schema field changedAug 25, 2026

changedOutput schema / (root)

Previous value: -{
-  "additionalProperties": true,
-  "description": "Standard ExpenseBot tool result envelope. `message` is the human-readable summary the AI cites; `data` is the structured payload (totals, breakdowns, ids, etc.). On failure, `success` is false and `error` carries a code/message/hint triple.",
-  "properties": {
-    "data": {
-      "additionalProperties": true,
-      "description": "Structured payload. Shape varies per tool — common keys: total, breakdown, comparison, sampleMeta, ids, expenseId, reportId, signupUrl, results.",
-      "type": "object"
-    },
-    "error": {
-      "additionalProperties": true,
-      "description": "Present only when success === false.",
-      "properties": {
-        "code": {
-          "type": "string"
-        },
-        "hint": {
-          "type": "string"
-        },
-        "message": {
-          "type": "string"
-        }
-      },
-      "type": "object"
-    },
-    "message": {
-      "description": "Human-readable result text. Always present on success; prefer rendering this verbatim before any further reasoning.",
-      "type": "string"
-    },
-    "sampleMeta": {
-      "additionalProperties": true,
-      "description": "Set when the underlying dataset was truncated. isTruncated=true means the agent saw a sample of `sampleCount` of `totalCount` rows; aggregate totals are still accurate.",
-      "properties": {
-        "isTruncated": {
-          "type": "boolean"
-        },
-        "sampleCount": {
-          "type": "integer"
-        },
-        "totalCount": {
-          "type": "integer"
-        }
-      },
-      "type": "object"
-    },
-    "success": {
-      "description": "False on tool errors; check before reading `data`.",
-      "type": "boolean"
-    }
-  },
-  "type": "object"
-}New value: +null

First observedAug 10, 2026

TDQS

A4.2/5.0

Behavior3/5

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

Annotations already declare readOnlyHint=true, destructiveHint=false and closed-world scope, so the safety profile is covered. The description adds that results are heuristic ('suspects') and that analysis is scoped to the user's expenses, but it does not note data prerequisites (e.g. need for imported expenses) or that sampleMeta indicates partial samples. Adequate but thin beyond structured fields.

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?

One sentence of purpose plus two compact labeled fragments (examples, returns), all front-loaded with zero filler. The structure lets an agent extract routing guidance and return shape at a glance.

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 and all three parameters documented, the description needs only to convey intent and detection categories, which it does. The only residual gap is data prerequisites/empty-result behavior, which is minor for a read-only audit tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the baseline is 3; the description adds real value by mapping natural-language examples to the `query` parameter and listing categories that mirror the `focus` enum (recurring, duplicates, price increases, trial conversions). It does not discuss how `focus` interacts with `query` or `dateRange`, leaving minor ambiguity.

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 ('Subscription audit') and enumerates exactly what it detects: recurring charges, duplicates, price increases, trial conversions. This clearly separates it from generic siblings like get_spending_summary or get_deep_analytics without the agent needing to open a schema.

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?

The sample phrasings ('recurring subscriptions', 'price increases', 'trial conversions', 'over $20/month') make it clear what kinds of user requests should route here, giving strong positive guidance. It stops short of explicit exclusions, e.g. that non-subscription spend analysis belongs to get_spending_summary.

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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