validate_gstin
Validates the structure, format, and checksum of a GSTIN (Goods and Services Tax Identification Number), and extracts the State, PAN, Entity Type, and Checksum status.
This record as markdown: /tools/denispaul-india-business-mcp-server/validate-gstin.md
What validate_gstin does on India Business
AI agents call validate_gstin to retrieve information from India Business without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
gstin | string | Yes | The 15-character GSTIN (e.g., '27AAPFU0939F1ZV') |
Parameters from the server's own tool schema.
Why validate_gstin is rated Low
This tool performs validation and extraction of information from a GSTIN number. It reads and parses an input string to verify its format and checksum, then returns extracted components (State, PAN, Entity Type, Checksum status). There are no side effects, no data modifications, no code execution, and no irreversible actions.
From the tool's definition Tool 'validates the structure, format, and checksum of a GSTIN' and 'extracts' data; uses words like 'validates' and 'extracts' indicating data retrieval and validation only, with no modification, deletion, or execution of external operations.
Attacks that exploit this kind of access
The rule that runs validate_gstin safely
PolicyLayer is an MCP gateway: it sits between your AI agents and India Business, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For validate_gstin, this is the rule to start with:
validate_gstin is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect India Business, apply this rule, and every validate_gstin call is checked against it from then on.
Questions about validate_gstin
Validates the structure, format, and checksum of a GSTIN (Goods and Services Tax Identification Number), and extracts the State, PAN, Entity Type, and Checksum status. It is categorised as a Read tool in the India Business MCP Server, which means it retrieves data without modifying state.
validate_gstin accepts 1 parameter: gstin. Required: gstin. The full parameter table on this page comes from the server's own tool schema.
Register the India Business MCP server in PolicyLayer and add a rule for validate_gstin: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches India Business. Nothing to install.
validate_gstin is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the validate_gstin rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for validate_gstin. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
validate_gstin is provided by the India Business MCP server (@denispaul/india-business-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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