validate_credit_card
Validate a credit card number using Luhn algorithm.
This record as markdown: /tools/io-tinyfn-tinyfn/validate-credit-card.md
What validate_credit_card does on TinyFn
AI agents call validate_credit_card to retrieve information from TinyFn 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 |
|---|---|---|---|
number | string | Yes | Credit card number |
Parameters from the server's own tool schema.
Why validate_credit_card is rated Low
This tool only reads and validates input against a checksum algorithm (Luhn). It has no side effects, cannot move money, create charges, or modify any data. It is purely a computational validation check, making it a Read operation with low severity. The confidence is high because validation tools are inherently read-only with no destructive or financial capability.
From the tool's definition Tool name is 'validate_credit_card' with description 'Validate a credit card number using Luhn algorithm.' The function performs validation only—it checks the mathematical validity of a credit card number without charging, modifying, or deleting anything.
Attacks that exploit this kind of access
The rule that runs validate_credit_card safely
PolicyLayer is an MCP gateway: it sits between your AI agents and TinyFn, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For validate_credit_card, this is the rule to start with:
validate_credit_card 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 TinyFn, apply this rule, and every validate_credit_card call is checked against it from then on.
Questions about validate_credit_card
Validate a credit card number using Luhn algorithm. It is categorised as a Read tool in the TinyFn MCP Server, which means it retrieves data without modifying state.
validate_credit_card accepts 1 parameter: number. Required: number. The full parameter table on this page comes from the server's own tool schema.
Register the TinyFn MCP server in PolicyLayer and add a rule for validate_credit_card: 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 TinyFn. Nothing to install.
validate_credit_card 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_credit_card 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_credit_card. 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_credit_card is provided by the TinyFn MCP server (https://api.tinyfn.io/mcp/all/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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