# isw_validate_card

Validate card CVV and expiry. Requires confirm: true.

Agent View of the PolicyLayer registry record for `isw_validate_card`. HTML page: https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-validate-card

## Facts

- Tool: `isw_validate_card`
- Server: Interswitch (`interswitch-mcp-server`) — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server.md
- Install: `npx -y interswitch-mcp-server`
- Homepage: https://github.com/Dairus01/Interswitch-mcp-server
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "isw_validate_card",
    "arguments": {}
  }
}
```

## Why isw_validate_card is rated Low

The tool validates card credentials (CVV and expiry), which is a read/verification operation — it checks whether the provided values are correct without modifying data. However, it handles highly sensitive payment card data (CVV, expiry), giving it high severity since misuse could facilitate card fraud or unauthorized access.

From the tool's own definition: "Validate card CVV and expiry"

## Use case

AI agents call isw_validate_card to retrieve information from Interswitch without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Interswitch:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "isw_validate_card": {}
  }
}
```

## Other tools on Interswitch (73)

- `isw_block_card` — Destructive — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-block-card.md
- `isw_deactivate_paycode` — Destructive — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-deactivate-paycode.md
- `isw_agency_requery_xml` — Execute — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-agency-requery-xml.md
- `isw_fintech_build_response` — Execute — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-fintech-build-response.md
- `isw_fintech_compute_mac` — Execute — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-fintech-compute-mac.md
- `isw_agency_banking_cashout` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-agency-banking-cashout.md
- `isw_agency_cashout_xml` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-agency-cashout-xml.md
- `isw_airtime_recharge` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-airtime-recharge.md
- `isw_bulk_card_production` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-bulk-card-production.md
- `isw_bulk_transfer` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-bulk-transfer.md
- `isw_complete_credit` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-complete-credit.md
- `isw_create_bulk_paycodes` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-create-bulk-paycodes.md
- `isw_create_card` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-create-card.md
- `isw_create_paycode` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-create-paycode.md
- `isw_create_payment_link` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-create-payment-link.md
- `isw_get_airtime_epins` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-get-airtime-epins.md
- `isw_initialize_payment` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-initialize-payment.md
- `isw_initiate_refund` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-initiate-refund.md
- `isw_pay_bill` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-pay-bill.md
- `isw_pay_vas_bill` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-pay-vas-bill.md
- `isw_request_nano_loan` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-request-nano-loan.md
- `isw_salary_lending` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-salary-lending.md
- `isw_single_transfer` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-single-transfer.md
- `isw_value_financing` — Financial — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-value-financing.md
- `isw_agency_get_token` — Read — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-agency-get-token.md
- `isw_block_prepaid_card` — Read — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-block-prepaid-card.md
- `isw_check_debit_balance` — Read — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-check-debit-balance.md
- `isw_check_prepaid_balance` — Read — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-check-prepaid-balance.md
- `isw_confirm_debit_sufficient` — Read — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-confirm-debit-sufficient.md
- `isw_confirm_prepaid_sufficient` — Read — https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server/isw-confirm-prepaid-sufficient.md
- …and 43 more: https://policylayer.com/tools/io-github-dairus01-interswitch-mcp-server.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-dairus01-interswitch-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-dairus01-interswitch-mcp-server