ra_add_card

Part of the Ra Pay MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.

// WHEN AI AGENTS USE THIS TOOL

AI agents use ra_add_card to create or modify resources in Ra Pay. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.

// WHY ENFORCE A POLICY ON RA_ADD_CARD

Without a policy, an AI agent could call ra_add_card repeatedly, creating or modifying resources faster than any human could review. Intercept's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Ra Pay.

// RECOMMENDED POLICY

Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.

ra-pay.yaml

tools:
  ra_add_card:
    rules:
      - action: allow
        rate_limit:
          max: 30
          window: 60

See the full Ra Pay policy for all 8 tools.

// DETAILS

Tool Name ra_add_card

Category Write

MCP Server Ra Pay MCP Server

Risk Level Medium

// MORE RA PAY TOOLS

Financial ra_refund Write ra_balance Write ra_dashboard Write ra_dispute Write ra_send Write ra_whoami Read ra_history

// WHAT CAN GO WRONG

Agents calling write-class tools like ra_add_card have been implicated in these attack patterns. Read the full case and prevention policy for each:

Browse the full MCP Attack Database →

// OTHER WRITE TOOLS ACROSS MCP SERVERS

Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.

AbraFlexi contact_create AbraFlexi contact_update AbraFlexi evidence_create AbraFlexi evidence_update AbraFlexi invoice_issued_update AbraFlexi invoice_received_create

// RELATED READING

// FAQ

What does the ra_add_card tool do? +

Save a credit card for sending payments. This requires the user to interact with a browser — the AI agent should prompt the user to run `ra add-card` in their terminal. The user's card is saved securely via Stripe Checkout (Ra Pay never sees card data). After saving a card, the user can send payments with `ra send` without needing a full Stripe Connect account.. It is categorised as a Write tool in the Ra Pay MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on ra_add_card? +

Add a rule in your Intercept YAML policy under the tools section for ra_add_card. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Ra Pay MCP server.

What risk level is ra_add_card? +

ra_add_card is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit ra_add_card? +

Yes. Add a rate_limit block to the ra_add_card 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.

How do I block ra_add_card completely? +

Set action: deny in the Intercept policy for ra_add_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.

What MCP server provides ra_add_card? +

ra_add_card is provided by the Ra Pay MCP server (@rapay/mcp-server). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

ra_add_card

Enforce policies on Ra Pay