See how an MCP server’s advertised capability surface changed
See how an MCP server’s advertised capability surface changed. Reports capabilities and features added or removed, and the shift in the aggregate annotation surface: how many tools declare themselves read-only, destructive, idempotent or open-world. That total governs what a client may let an agent do without asking a human.
Not tested: has real-world effectsour last check, 2026-10-04
0 of 0checks answered this week
n/amedian answer time
$0.12listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://api.zfinia.com/x402/v1/mcp-capability-surface-diff
| Category | Everything else |
|---|---|
| Provider host | api.zfinia.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"body": {
"after": {
"capabilities": {
"tools": {
"listChanged": false
}
},
"serverInfo": {
"name": "orders-mcp",
"version": "2.0.0"
},
"tools": [
{
"annotations": {
"idempotentHint": true
},
"description": "List orders.",
"inputSchema": {
"properties": {
"page": {
"description": "Page number, starting at 1.",
"minimum": 1,
"type": "integer"
},
"region": {
"description": "Data region to query.",
"type": "string"
},
"status": {
"description": "Restrict to one status.",
"enum": [
"open",
"shipped",
"disputed"
],
"type": "string"
},
"tenant_id": {
"description": "The tenant whose orders to list.",
"type": "string"
}
},
"required": [
"tenant_id",
"region"
],
"type": "object"
},
"name": "list_orders",
"outputSchema": {
"properties": {
"items": {
"type": "array"
}
},
"required": [
"items"
],
"type": "object"
}
},
{
"annotations": {
"readOnlyHint": true
},
"description": "Fetch one order by its identifier, including line items and the current fulfilment state.",
"inputSchema": {
"properties": {
"order_id": {
"description": "The order identifier.",
"type": "string"
}
},
"required": [
"order_id"
],
"type": "object"
},
"name": "get_order"
},
{
"annotations": {
"destructiveHint": true,
"idempotentHint": false
},
"description": "Cancel an order that has not yet shipped. This cannot be undone and will issue a refund where one is due.",
"inputSchema": {
"properties": {
"order_id": {
"description": "The order to cancel.",
"type": "string"
},
"reason": {
"description": "Why it is being cancelled.",
"type": "string"
}
},
"required": [
"order_id"
],
"type": "object"
},
"name": "cancel_order"
}
]
},
"before": {
"capabilities": {
"resources": {
"subscribe": true
},
"tools": {
"listChanged": true
}
},
"serverInfo": {
"name": "orders-mcp",
"version": "1.3.0"
},
"tools": [
{
"annotations": {
"idempotentHint": true,
"readOnlyHint": true
},
"description": "List orders for a tenant, newest first, with optional paging. Returns only orders the caller is entitled to see.",
"inputSchema": {
"properties": {
"page": {
"description": "Page number, starting at 1.",
"minimum": 1,
"type": "integer"
},
"status": {
"description": "Restrict to one status.",
"enum": [
"open",
"shipped"
],
"type": "string"
},
"tenant_id": {
"description": "The tenant whose orders to list.",
"type": "string"
}
},
"required": [
"tenant_id"
],
"type": "object"
},
"name": "list_orders",
"outputSchema": {
"properties": {
"items": {
"type": "array"
},
"next_page": {
"type": [
"integer",
"null"
]
}
},
"required": [
"items"
],
"type": "object"
}
},
{
"annotations": {
"readOnlyHint": true
},
"description": "Fetch one order by its identifier, including line items and the current fulfilment state.",
"inputSchema": {
"properties": {
"order_id": {
"description": "The order identifier.",
"type": "string"
}
},
"required": [
"order_id"
],
"type": "object"
},
"name": "get_order",
"outputSchema": {
"properties": {
"id": {
"type": "string"
},
"total": {
"type": "number"
}
},
"required": [
"id"
],
"type": "object"
}
},
{
"annotations": {
"destructiveHint": true,
"idempotentHint": false
},
"description": "Cancel an order that has not yet shipped. This cannot be undone and will issue a refund where one is due.",
"inputSchema": {
"properties": {
"order_id": {
"description": "The order to cancel.",
"type": "string"
},
"reason": {
"description": "Why it is being cancelled.",
"type": "string"
}
},
"required": [
"order_id"
],
"type": "object"
},
"name": "cancel_order"
}
]
}
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"after": {},
"before": {}
},
"required": [
"before",
"after"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}