Mirabello Immigration Intelligence

Compare Treaty Position

compare_treaty_position

Read-onlyIdempotent

Double-tax-treaty position for a relocation corridor (from→to): is a DTA in force, the residence tie-breaker test, treaty withholding rates (dividends/interest/royalties), and any limitation-on-benefits/principal-purpose test. Use ISO alpha-2 codes. Indicative, not advice.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "from": "<from>",
      "to": "<to>"
    },
    "name": "compare_treaty_position"
  }
}

Input Schema

Name	Required	Description	Default
`to`	Yes	End of the date range, ISO date (YYYY-MM-DD).
`from`	Yes	Start of the date range, ISO date (YYYY-MM-DD).

Output Schema

Name	Required	Description	Default
`error`	No
`terms`	No
`source`	No
`book_url`	No
`provider`	No
`disclaimer`	No
`data_updated`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed8 schema fields changedOct 25, 2026

changedOutput schema / description

Previous value: -"Mirabello response envelope. Tool-specific fields vary; the provenance/disclaimer envelope is always present."New value: +"Mirabello envelope; tool fields vary; error only on failure."

removedOutput schema / properties / book_url / description

Removed value: -"Link to request a consultation with a Mirabello specialist, for a personal case."

removedOutput schema / properties / data_updated / description

Removed value: -"Date the underlying dataset was last updated."

removedOutput schema / properties / disclaimer / description

Removed value: -"Information, not legal/tax/financial/immigration advice; figures indicative."

removedOutput schema / properties / error / description

Removed value: -"Present only when the request could not be fulfilled."

removedOutput schema / properties / provider / description
```
Removed value: -"Always \"Mirabello Consultancy\"."
```

removedOutput schema / properties / source / description

Removed value: -"Attribution for the data, when it is not Mirabello Consultancy itself."

removedOutput schema / properties / terms / description

Removed value: -"Acceptable-use and information-not-advice terms."

Changed3 schema fields changedOct 8, 2026

removedOutput schema / properties / book_a_consultation

Removed value: -{
-  "description": "URL to book a Mirabello consultation.",
-  "type": "string"
-}

addedOutput schema / properties / book_url

Added value: +{
+  "description": "Link to request a consultation with a Mirabello specialist, for a personal case.",
+  "type": "string"
+}

changedOutput schema / properties / source / description

Previous value: -"Attribution for the data."New value: +"Attribution for the data, when it is not Mirabello Consultancy itself."

Changed4 schema fields changedSep 23, 2026
- addedInput schema / properties / from / description
```
Added value: +"Start of the date range, ISO date (YYYY-MM-DD)."
```
- addedInput schema / properties / from / examples
```
Added value: +[
+  "2026-01-01"
+]
```
- addedInput schema / properties / to / description
```
Added value: +"End of the date range, ISO date (YYYY-MM-DD)."
```
- addedInput schema / properties / to / examples
```
Added value: +[
+  "2026-12-31"
+]
```

Changed1 schema field changedJul 27, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "description": "Mirabello response envelope. Tool-specific fields vary; the provenance/disclaimer envelope is always present.",
+  "properties": {
+    "book_a_consultation": {
+      "description": "URL to book a Mirabello consultation.",
+      "type": "string"
+    },
+    "data_updated": {
+      "description": "Date the underlying dataset was last updated.",
+      "type": "string"
+    },
+    "disclaimer": {
+      "description": "Information, not legal/tax/financial/immigration advice; figures indicative.",
+      "type": "string"
+    },
+    "error": {
+      "description": "Present only when the request could not be fulfilled.",
+      "type": "string"
+    },
+    "provider": {
+      "description": "Always \"Mirabello Consultancy\".",
+      "type": "string"
+    },
+    "source": {
+      "description": "Attribution for the data.",
+      "type": "string"
+    },
+    "terms": {
+      "description": "Acceptable-use and information-not-advice terms.",
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

AddedJun 27, 2026

TDQS

C2.9/5.0

Behavior4/5

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

The annotations already establish that this is a read-only, idempotent, non-destructive, closed-world operation. The description adds useful context by stating the analytical scope and the 'indicative, not advice' caveat, though it does not discuss freshness or source limitations.

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 description is front-loaded and dense, packing the purpose, output scope, input convention, and disclaimer into one efficient sentence plus caveat. There is little wasted text, though the long semicolon-separated list is slightly harder to scan.

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

Completeness2/5

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

An output schema exists and the annotations are rich, so return-value and safety details need not be repeated. However, for a two-parameter comparison tool, the description's country-code guidance directly conflicts with the schema's date-range definition, making it incomplete and unsafe to call without opening the schema.

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

Parameters1/5

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

The description says to use ISO alpha-2 country codes for from→to, while the input schema explicitly defines both parameters as ISO dates for a range. This is an active contradiction that would mislead an agent about how to populate the required parameters.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the treaty-position resource and enumerates what the comparison covers: DTA status, residence tie-breaker, withholding rates, and LOB/PPT. It does not explicitly differentiate this tool from siblings such as withholding_map or get_country_tax, which keeps it from a 5.

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

Usage Guidelines2/5

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

It gives only an implied use case (a relocation corridor) and a disclaimer ('Indicative, not advice'), but never says when to use this instead of alternatives like withholding_map or choice_of_law_options. No when-not or sibling routing guidance is provided.

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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