mcp-server

Compare Formation Structures

compare_formation

Read-only

Side-by-side comparison of 2-6 formation structures across tax position, setup/annual costs, timeline, remote feasibility, substance requirements, banking tier, EU/FATF status, ideal client and not-for. Pass structures as an array of profile keys (e.g. ["us-llc-wy","ae-freezone","ee-ou"]). Comparative facts only — the right choice turns on the owner’s residence and goals; information, not advice.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`structures`	Yes	2-6 profile keys

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.
`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.
`book_a_consultation`	No	URL to book a Mirabello consultation.

Schema Changelog

Changes observed during successful MCP inspections.

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"
+}

AddedJul 25, 2026

TDQS

A4.5/5.0

Behavior4/5

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

Annotations already establish read-only and non-destructive behavior. The description adds meaningful context beyond that by stating the tool provides 'comparative facts only' and is 'information, not advice', which sets expectations that it will not recommend a structure. No contradiction exists.

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?

The description is compact and front-loaded: it immediately names the action and scope, then lists the comparison dimensions, then gives the input format, then adds an important caveat. Every sentence earns its place and there is no redundant filler.

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?

For a single-parameter, read-only tool with a rich output schema and safety annotations, the description is complete. It covers the input range and format, the fields being compared, the informational boundary, and the decision-relevant context about the owner's residence and goals.

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% and the schema describes the 'structures' parameter as '2-6 profile keys'. The description adds value by providing concrete examples of valid keys and emphasizing that input must be an array of profile keys, reinforcing the schema without repeating it verbatim.

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 a specific verb ('compare'), a clear resource ('formation structures'), and enumerates the exact comparison dimensions. This distinguishes it from sibling tools like compare_programmes and compare_scenarios without needing to open any schemas.

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 description provides clear context for when to use the tool by defining its scope ('formation structures') and specifying the comparison dimensions. It also frames the output as comparative facts rather than advice, though it does not explicitly name alternative tools or state when not to use it.

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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