# isw_validate_customer

Validate a customer account, meter, or phone number for a biller.

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

## Facts

- Tool: `isw_validate_customer`
- 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_customer",
    "arguments": {}
  }
}
```

## Why isw_validate_customer is rated Low

Validation is a read-only query operation that retrieves or confirms the existence and status of customer information. It performs no write, destructive, or financial operations. The low severity reflects minimal blast radius if misused—an attacker could enumerate valid customer identifiers but cannot modify data, execute commands, or commit financial transactions.

From the tool's own definition: "Tool name 'validate_customer' and description 'Validate a customer account, meter, or phone number for a biller' indicates a lookup/verification operation with no data modification or financial transaction."

## Use case

AI agents call isw_validate_customer 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_customer": {}
  }
}
```

## 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