FatturaPA / SDI

Validate an Italian VAT number using the official MEF checksum algorithm. Performs format validation and the Ministry of Economy checksum algorithm. No network call — fully local computation. Args: piva: Italian VAT number string. May include or omit the "IT" prefix. Expected: 11 digits after stripping prefix and whitespace. ctx: Optional MCP context for structured log emission. Returns: A CheckPivaResult with keys: valid (bool): Whether the P.IVA passes format and checksum checks. piva (str): Normalised P.IVA (11 digits, no prefix). reason (str | None): Failure reason if valid is False, else None.

Extract key fields from a validated FatturaPA XML document. Parses the header and first body section to return structured invoice metadata. Never logs or persists XML content — only derived values are returned. Missing fields yield None rather than raising KeyError. When *file_path* is given the document is read from disk; the path is checked against the roots configured in ``FATTURAPA_ALLOWED_ROOTS`` before any read is attempted. Pass *xml_content* directly to skip file I/O. Args: xml_content: Raw XML string of a validated FatturaPA document. ctx: Optional MCP context for structured log emission. file_path: Optional filesystem path to read the document from. Checked against allowed roots before reading. Returns: An ExtractResult TypedDict with supplier, customer, invoice header fields, and aggregated line_items from all body sections. Raises: PermissionError: If *file_path* is outside the configured allowed roots. ValueError: If neither *xml_content* nor *file_path* is provided. lxml.etree.XMLSyntaxError: If the XML is not well-formed.

Detect inconsistencies and anomalies in a FatturaPA XML document. Checks eight anomaly categories: document total mismatch, VAT calculation error, future invoice date, invalid Italian P.IVA checksum, missing or suspicious destination code, incomplete line items, unjustified negative amount, and missing payment data. Never logs or persists XML content. When *file_path* is given the document is read from disk; the path is checked against the roots configured in ``FATTURAPA_ALLOWED_ROOTS`` before any read is attempted. Pass *xml_content* directly to skip file I/O. Args: xml_content: Raw XML string of the FatturaPA document. ctx: Optional MCP context for structured log emission. file_path: Optional filesystem path to read the document from. Checked against allowed roots before reading. Returns: A FindAnomaliesResult with keys: anomalies_found (int): Total number of anomalies detected. anomalies (list): All anomaly records. warnings (list): Only warning-severity anomalies. errors (list): Only error-severity anomalies. is_clean (bool): True when no anomalies are found. Raises: PermissionError: If *file_path* is outside the configured allowed roots. ValueError: If neither *xml_content* nor *file_path* is provided. lxml.etree.XMLSyntaxError: If the XML is not well-formed.

Aggregate a batch of FatturaPA XML documents into a structured report. Processes each invoice through extract_invoice_data and find_invoice_anomalies, then aggregates the results into totals, supplier/customer breakdowns, and an anomaly summary. Documents that cannot be parsed are counted separately in the *errors* list; they do not affect the monetary totals. Never logs or persists XML content. Progress notifications: one step per invoice (1..N), then a final step (N+1) for the aggregation phase. Args: xml_contents: List of raw FatturaPA XML strings to process. title: Optional report title; defaults to ``"Invoice Report"``. ctx: Optional MCP context for structured log emission. Returns: An InvoiceReportResult TypedDict with aggregated statistics, party breakdowns (suppliers/customers), and an anomaly summary.

Look up an SDI error code and return its human-readable description. Uses a local static table of official AdE error codes. No network call required. Args: error_code: SDI error code string (e.g., "00001", "00002"). ctx: Optional MCP context for structured log emission. Returns: A LookupResult with keys: code (str): The queried error code. description (str): Official Italian description. category (str): Error category (e.g., "STRUTTURA", "CONTENUTO"). resolution (str): Suggested resolution hint. Raises: ValueError: If *error_code* is not found in the known error table.

Validate a FatturaPA XML document against the appropriate XSD schema. Auto-detects schema version (v1.2 or v1.3) from the XML namespace. Returns a structured result without logging any XML content. When *file_path* is given the document is read from disk; the path is checked against the roots configured in ``FATTURAPA_ALLOWED_ROOTS`` before any read is attempted. Pass *xml_content* directly to skip file I/O. Args: xml_content: Raw XML string of the FatturaPA document. ctx: Optional MCP context for structured log emission. file_path: Optional filesystem path to read the document from. Checked against allowed roots before reading. Returns: A ValidateResult with keys: valid (bool): Whether the document passed XSD validation. version (str): Detected schema version ("1.2", "1.3", or "unknown"). errors (list[str]): Validation error messages, empty if valid. Raises: PermissionError: If *file_path* is outside the configured allowed roots. ValueError: If neither *xml_content* nor *file_path* is provided.

Verify a VAT number against the EU VIES (VAT Information Exchange System). Calls the official EU VIES REST endpoint with a configurable timeout. On timeout or service unavailability, returns a degraded response with source="unavailable" rather than raising — the caller must handle this case. Args: country_code: Two-letter ISO 3166-1 alpha-2 country code (e.g., "IT"). vat_number: VAT number without the country prefix (e.g., "12345678901"). ctx: Optional MCP context for structured log emission. Returns: A VerifyPivaViesResult with keys: valid (bool): Whether VIES confirmed the VAT number as active. name (str | None): Registered business name, if disclosed by VIES. address (str | None): Registered address, if disclosed by VIES. source (str): "vies" if live response, "unavailable" if service down.