swap_txn · Tinyman MCP Server MCP: Risk & Policy

WHAT IT DOES

What swap_txn does on Tinyman MCP Server

AI agents invoke swap_txn to trigger actions in Tinyman MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why swap_txn needs a policy

swap_txn triggers real processes with real consequences. An agent gone sideways doesn't fire it once — it starts dozens of builds, sends mass notifications, or burns through compute before anyone looks up.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

swap_txn Rate-limited

swap_txn 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.

View as policy code

policy.json

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

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Tinyman MCP Server, so you can run agents against it safely.

FAQ

Questions about swap_txn

What does the swap_txn tool do? +

Build unsigned transactions to swap tokens on Tinyman v2 (Algorand). Returns base64-encoded transactions for signing via wallet. It is categorised as a Execute tool in the Tinyman MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on swap_txn? +

Register the Tinyman MCP Server MCP server in PolicyLayer and add a rule for swap_txn: 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 Tinyman MCP Server. Nothing to install.

What risk level is swap_txn? +

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

Can I rate-limit swap_txn? +

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

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

swap_txn is provided by the Tinyman MCP Server MCP server (nautilusoss/tinymanmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.