wallet_internalizeAction

THE RISK

Medium Risk

Why wallet_internalizeAction needs a policy

This tool modifies wallet state by incorporating external transactions and adding outputs to wallet baskets. It is a Write operation as it creates/modifies wallet data. While it involves financial instruments (BSV), the action described is wallet management rather than directly moving money or committing financial obligations — however, internalizing a transaction could affect wallet balances and enable subsequent…

From the tool's definition Internalizes an external transaction, adding its outputs to wallet baskets

Documented attack patterns abuse exactly the kind of access wallet_internalizeAction gives an agent:

POLICY

How to control wallet_internalizeAction

PolicyLayer is an MCP gateway — it sits between your AI agents and Bitcoin SV MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for wallet_internalizeAction:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "wallet_internalizeAction": {
      "limits": [
        {
          "counter": "wallet_internalizeaction_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

wallet_internalizeAction stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Bitcoin SV MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

Govern customer-ops agents → PII redaction, approval on external messages, and no-bulk-delete rules on the records agents change.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about wallet_internalizeAction

What does the wallet_internalizeAction tool do? +

Internalizes an external transaction, adding its outputs to wallet baskets. It is categorised as a Write tool in the Bitcoin SV MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on wallet_internalizeAction? +

Register the Bitcoin SV MCP Server MCP server in PolicyLayer and add a rule for wallet_internalizeAction: 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 Bitcoin SV MCP Server. Nothing to install.

What risk level is wallet_internalizeAction? +

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

Can I rate-limit wallet_internalizeAction? +

Yes. Add a rate_limit block to the wallet_internalizeAction 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.

How do I block wallet_internalizeAction completely? +

Set action: deny in the PolicyLayer policy for wallet_internalizeAction. 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 wallet_internalizeAction? +

wallet_internalizeAction is provided by the Bitcoin SV MCP Server MCP server (b-open-io/bsv-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Bitcoin SV MCP Server tool call.

Start from Bitcoin SV MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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