Do I need to register with GSTN directly?

Most integrations go through a licensed GST Suvidha Provider (GSP) rather than GSTN directly; the GSP holds the relevant API access.

Can this tool file GST returns automatically?

It can prepare and structure the data, but treat automated filing as something to route through your GSP's filing API with a human review step, not something to fully automate blind.

Are the tax rates and penalty amounts in this guide current?

Don't rely on any fixed figures from a guide for actual filing decisions — GST rates, due dates, and penalties change; pull current values from your GSP or an official source at filing time.

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MCP GST Verification Integration

Verify GSTIN numbers and structure invoice data from an MCP server, wired to a licensed GSP rather than a raw scraped source.

Quick Answer / TL;DR

Expose GSTIN verification and invoice-data-structuring as narrow MCP tools backed by a licensed GST Suvidha Provider (GSP) API, validate the GSTIN format before calling out, and treat exact tax rates, due dates, and penalty amounts as values to fetch from the GSP or a current official source rather than hardcode, since tax rules change.

Key Takeaways

Validate the GSTIN format locally before making an API call, to fail fast on obviously malformed input.
Source live rates and deadlines from your GSP integration rather than hardcoding them into the tool.
Treat this as a read/verify and structure-generation tool, not a substitute for a qualified tax filing workflow.

GSTIN verification

Validate the GSTIN's format locally first — it is a fixed 15-character pattern — before spending an API call on obviously invalid input.

typescript

const GSTINSchema = z.object({
  gstin: z.string().regex(/^[0-9]{2}[A-Z]{5}[0-9]{4}[A-Z]{1}[1-9A-Z]{1}Z[0-9A-Z]{1}$/),
});

server.setRequestHandler(CallToolRequestSchema, async (request) => {
  if (request.params.name === "verify_gstin") {
    const { gstin } = GSTINSchema.parse(request.params.arguments);
    const result = await gspClient.verifyGSTIN(gstin);
    return { content: [{ type: "text", text: JSON.stringify(result) }] };
  }
});

Structuring invoice data

A tool that assembles invoice line items into the e-invoice schema is useful, but pull the applicable GST rate per item from your GSP or product master rather than hardcoding rate slabs, since they can change.