mcp-server

Flag CFC / PoE Risk

flag_cfc_poe_risk

Read-only

Anti-avoidance & relocation-tax flags for a jurisdiction: CFC (controlled foreign company), GAAR (general anti-avoidance rule), POEM (place of effective management)/corporate-residence, economic substance, exit-tax detail and step-up-in-basis on becoming resident. The depth behind headline rates. Use ISO alpha-2. Indicative, not advice.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`cc`	Yes	ISO 3166-1 alpha-2 country code, uppercase (e.g. "PT" Portugal, "AE" United Arab Emirates, "KN" St Kitts and Nevis).

Output Schema

TableJSON Schema

Name	Required	Description
`error`	No	Present only when the request could not be fulfilled.
`terms`	No	Acceptable-use and information-not-advice terms.
`source`	No	Attribution for the data, when it is not Mirabello Consultancy itself.
`book_url`	No	Link to request a consultation with a Mirabello specialist, for a personal case.
`provider`	No	Always "Mirabello Consultancy".
`disclaimer`	No	Information, not legal/tax/financial/immigration advice; figures indicative.
`data_updated`	No	Date the underlying dataset was last updated.

Schema Changelog

Changes observed during successful MCP inspections.

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."

Changed2 schema fields changedSep 23, 2026

addedInput schema / properties / cc / description

Added value: +"ISO 3166-1 alpha-2 country code, uppercase (e.g. \"PT\" Portugal, \"AE\" United Arab Emirates, \"KN\" St Kitts and Nevis)."

addedInput schema / properties / cc / examples
```
Added value: +[
+  "PT",
+  "AE"
+]
```

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

A3.9/5.0

Behavior4/5

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

Annotations already declare readOnlyHint=true, openWorldHint=false, destructiveHint=false, covering the safety profile. The description adds a meaningful caveat — 'Indicative, not advice' — warning the agent not to present output as professional advice, which is valuable behavioral context beyond 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 description is a single front-loaded paragraph that lists scope efficiently, then adds two short sentences for usage context and disclaimer. The only slight waste is 'Use ISO alpha-2', which duplicates the schema.

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, return values need no explanation. The description covers scope, disclaimer, and parameter format; the only minor gap is that it doesn't state whether coverage is global or limited, but this is not critical for a one-parameter read-only flag tool.

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 coverage is 100% and the cc parameter is fully documented in the schema with examples. The description's 'Use ISO alpha-2' is redundant with the schema, adding no new semantic detail, so baseline 3 applies.

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 ('flag') and resource (anti-avoidance & relocation-tax risks for a jurisdiction) and enumerates the covered flags (CFC, GAAR, POEM, economic substance, exit-tax, step-up-in-basis). The clause 'The depth behind headline rates' distinguishes it from the sibling get_country_tax, so an agent can tell them apart without opening either schema.

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

Usage Guidelines3/5

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

The phrase 'The depth behind headline rates' implies when to use it (when headline rates are insufficient), but no alternative tool is named and no explicit when-not-to-use guidance is given. Usage context is inferable but not spelled out.

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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