wallet_sign_transaction_group

THE RISK

High Risk

Why wallet_sign_transaction_group needs a policy

Signing a group of transactions is a prerequisite to broadcasting them to the blockchain. While signing alone doesn't submit, in most MCP/agent contexts this operation is part of an automated flow that leads directly to execution of on-chain transactions. The tool operates on potentially multiple transactions at once (group), amplifying the blast radius.

From the tool's definition Sign a group of transactions with the active wallet account. Assigns group ID automatically.

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

POLICY

How to control wallet_sign_transaction_group

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "wallet_sign_transaction_group": {
      "limits": [
        {
          "counter": "wallet_sign_transaction_group_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

wallet_sign_transaction_group stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

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

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

Govern code and CI agents → Branch allowlists, approval on merges, and rate caps on the build and pipeline tools agents trigger.
High-risk tools in Algorand MCP → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
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_sign_transaction_group

What does the wallet_sign_transaction_group tool do? +

Sign a group of transactions with the active wallet account. Assigns group ID automatically. It is categorised as a Execute tool in the Algorand MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on wallet_sign_transaction_group? +

Register the Algorand MCP server in PolicyLayer and add a rule for wallet_sign_transaction_group: 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 Algorand MCP. Nothing to install.

What risk level is wallet_sign_transaction_group? +

wallet_sign_transaction_group is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit wallet_sign_transaction_group? +

Yes. Add a rate_limit block to the wallet_sign_transaction_group 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_sign_transaction_group completely? +

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

wallet_sign_transaction_group is provided by the Algorand MCP server (goplausible/algorand-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Algorand MCP tool call.

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

CHECK YOUR STACK →