Validate up to 100 IBANs in a single call with the same enrichment as validate_iban, at 60% lower cost per IBAN. When to use: processing a CSV of supplier bank accounts, validating a payment batch before submission, running KYC checks on a customer list, or auditing an accounts-payable file. Whe...
Part of the Ibanforge MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents call batch_validate_iban to retrieve information from Ibanforge without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though batch_validate_iban only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
tools:
batch_validate_iban:
rules:
- action: allowSee the full Ibanforge policy for all 5 tools.
Agents calling read-class tools like batch_validate_iban have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Read risk category across the catalogue. The same policy patterns (rate-limit, allow) apply to each.
Validate up to 100 IBANs in a single call with the same enrichment as validate_iban, at 60% lower cost per IBAN. When to use: processing a CSV of supplier bank accounts, validating a payment batch before submission, running KYC checks on a customer list, or auditing an accounts-payable file. When NOT to use: for a single IBAN, use validate_iban instead. For compliance/sanctions screening, use compliance_check on each IBAN. Behavior: this tool is read-only with no side effects. It validates each IBAN independently using the same logic as validate_iban (mod-97 checksum, BBAN parsing, BIC resolution, issuer classification). Results are returned in the same order as the input array. If one IBAN is invalid, the others are still processed — there is no short-circuit on error. Response time scales linearly: ~30ms per IBAN. Returns a JSON array. Input constraints: minimum 1 IBAN, maximum 100 IBANs per call. Exceeding 100 returns a validation error. Returns: Array of objects, each identical in structure to the validate_iban response: { valid, country, bban, bic, sepa, issuer, risk_indicators } Example: input ['DE89370400440532013000', 'INVALID123'] → [{ valid: true, ... }, { valid: false, error: 'Invalid checksum' }] Cost: $0.002 USDC per IBAN (e.g., 10 IBANs = $0.020, 50 IBANs = $0.100, 100 IBANs = $0.200).. It is categorised as a Read tool in the Ibanforge MCP Server, which means it retrieves data without modifying state.
Add a rule in your Intercept YAML policy under the tools section for batch_validate_iban. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Ibanforge MCP server.
batch_validate_iban 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 batch_validate_iban rule in your Intercept 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 Intercept policy for batch_validate_iban. 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.
batch_validate_iban is provided by the Ibanforge MCP server (ibanforge). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept