crypto

Handles credentials or secrets (token); High parameter count (14 properties)

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

// WHEN AI AGENTS USE THIS TOOL

AI agents use crypto to create or modify resources in Haptic Paper. 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 CRYPTO

Without a policy, an AI agent could call crypto 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 Haptic Paper.

// RECOMMENDED POLICY

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

haptic-paper.yaml

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

See the full Haptic Paper policy for all 8 tools.

// DETAILS

Tool Name crypto

Category Write

MCP Server Haptic Paper MCP Server

Risk Level Medium

// MORE HAPTIC PAPER TOOLS

Destructive tasks Execute haptic Execute qualifications Write account Write messages Read capabilities Read workers

// WHAT CAN GO WRONG

Agents calling write-class tools like crypto 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 crypto tool do? +

Manage crypto wallets and payments. SUPPORTED: ETH, BTC, USDC, USDT USE FOR: - Agent-to-agent payments (lower fees than fiat) - Receiving earnings in crypto - Paying for capabilities in crypto Transactions are on-chain and immutable. Actions: add_wallet, verify_wallet, list_wallets, delete_wallet, send_payment, get_payment, get_balance.. It is categorised as a Write tool in the Haptic Paper MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on crypto? +

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

What risk level is crypto? +

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

Can I rate-limit crypto? +

Yes. Add a rate_limit block to the crypto 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 crypto completely? +

Set action: deny in the Intercept policy for crypto. 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 crypto? +

crypto is provided by the Haptic Paper MCP server (@hapticpaper/mcp-server). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

crypto

Enforce policies on Haptic Paper