Canada Business Number Tools
Parse, format, shape-check and mask Canadian Business Numbers and CRA program account numbers (123456789 RT 0001), explain program codes and list the accounts CRA ties to an activity
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Mexico CFDI 4.0 Pre-check
Pre-flight check of a draft Mexican CFDI 4.0 invoice against the SAT XSD: required fields, code lists, RFC shape and the arithmetic of lines, taxes and totals
Unify Dynamics LLC
Tools6read-only
Sign-inNoneno account, no key
Data keptNoneprocessed in memory
PriceFreeoptional Pro limits
StatusLiveMCP + REST
Works withMCP · RESTany agent
Try asking
Real questions, and the tools your agent calls to answer them.
Before I send this invoice to my PAC, does it have every field CFDI 4.0 requires?
Tools called
validate_cfdi_draftlist_required_fieldsMy lines are 2 x 100.00 with 16% VAT: are SubTotal, the tax amount and Total right?
Tools called
check_cfdi_totalsIs AAA010101AAA written in a valid RFC shape for a company?
Tools called
validate_rfc_structureWhy is TipoCambio required on my dollar invoice and what does Exportacion mean?
Tools called
explain_cfdi_fieldvalidate_cfdi_draftWhich payment-form codes and payment-method codes does the CFDI 4.0 schema accept?
Tools called
list_catalog_codesAbout
Checks a draft CFDI 4.0 (JSON or XML) before it goes to a PAC for stamping, using only rules that appear in SAT's published cfdv40.xsd, tdCFDI.xsd and catCFDI.xsd: required attributes and children, value shapes (RFC, amounts, dates, postal codes), the verified code lists, the conditional rules written in the schema's own documentation (TipoCambio, Descuento, tax amounts) and the arithmetic between concept lines, taxes and Total. Returns a fix list with the schema rule behind each finding and an explicit list of what was NOT checked (catalogue membership, regime/use compatibility and the PAC's own validations). It never signs, stamps, sends or stores anything, and does not look anything up at SAT.
Sources: Reference data from official sources (sat.gob.mx); every answer states its source, date and validity period.
Privacy
The publisher, Unify Dynamics LLC, states that tool inputs are processed in memory and not retained.
Data not collectedNo account, no profile, no stored prompts or results.
What it can do
6 tools, grouped by job. Every one is read-only or compute-only.
- Validate cfdi draftCheck a draft CFDI 4.0 (JSON object or XML text) against the SAT schema rules and return a fix list with the rule behind each finding.
- Check cfdi totalsRecompute line amounts, tax amounts, SubTotal, Descuento and Total from concept lines with exact decimals and compare them with the declared figures.
- Validate rfc structureCheck that an RFC has the shape SAT's schema (t_RFC) allows: 12 or 13 characters, letters, a YYMMDD date part and a final digit or A; structure…
- List required fieldsList the attributes of a CFDI 4.0 element with required, optional or conditional status and the value constraints written in SAT's schema.
- List catalog codesList the code values SAT's catalogue schema enumerates for Exportacion, TipoDeComprobante, MetodoPago and FormaPago, and say which catalogues are…
- Explain cfdi fieldExplain one CFDI 4.0 field in plain language, quoting SAT's own schema documentation where the tool could read it and saying where the allowed…
Information
PublisherUnify Dynamics LLC
CategoryMoney & business · Mexico
LanguagesEnglish
Built forMexico
CompatibilityAny MCP client · any agent · REST
Version0.1.0
MCP endpoint
https://mx-cfdi-precheck.connectorbay.com/mcpREST APIopenapi.json
CountryMexico
FunctionInvoicing & tax
LayerDeep connectors
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