Decode ISIN (International Securities Identification Number) with Luhn check.
AI agents call decode_isin to retrieve information from Mcp India Stack without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Decoding an ISIN is a read-only operation that parses and validates a standardized financial identifier. It performs no side effects, does not retrieve sensitive personal data, does not execute code, and does not modify any state. The Luhn check is a standard checksum validation algorithm. This is a low-severity tool suitable for legitimate financial information lookup.
From the tool's definition Tool name 'decode_isin' and description 'Decode ISIN (International Securities Identification Number) with Luhn check' indicate a validation/parsing operation.
Documented attack patterns abuse exactly the kind of access decode_isin gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp India Stack, and nothing reaches the server without passing your rules. This is the rule we recommend for decode_isin:
{
"version": "1",
"default": "deny",
"tools": {
"decode_isin": {}
}
}decode_isin is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Decode ISIN (International Securities Identification Number) with Luhn check. It is categorised as a Read tool in the Mcp India Stack MCP Server, which means it retrieves data without modifying state.
Register the Mcp India Stack MCP server in PolicyLayer and add a rule for decode_isin: 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 Mcp India Stack. Nothing to install.
decode_isin 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 decode_isin 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 decode_isin. 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.
decode_isin is provided by the Mcp India Stack MCP server (rehan1020/mcp-india-stack). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp India Stack, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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58 Mcp India Stack tools catalogued and risk-classified — across an index of 43,000+ MCP servers.