Decode base64 signed transaction bytes back into a transaction object with signature details. Accepts the blob from sign_transaction or wallet_sign_transaction.
AI agents call decode_signed_transaction to retrieve information from Algorand MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is purely a read/parsing operation that examines the contents of an already-signed transaction blob and returns structured data. It has no side effects, cannot modify state, and cannot trigger financial transfers or blockchain transactions. The decoded output is informational only.
From the tool's definition Tool decodes base64 signed transaction bytes into a transaction object—it parses and retrieves information ('Decode', 'back into') without modifying, deleting, or executing any on-chain operations.
Documented attack patterns abuse exactly the kind of access decode_signed_transaction gives an agent:
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 decode_signed_transaction:
{
"version": "1",
"default": "deny",
"tools": {
"decode_signed_transaction": {}
}
}decode_signed_transaction is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Decode base64 signed transaction bytes back into a transaction object with signature details. Accepts the blob from sign_transaction or wallet_sign_transaction. It is categorised as a Read tool in the Algorand MCP MCP Server, which means it retrieves data without modifying state.
Register the Algorand MCP server in PolicyLayer and add a rule for decode_signed_transaction: 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.
decode_signed_transaction is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the decode_signed_transaction 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.
Set action: deny in the PolicyLayer policy for decode_signed_transaction. 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.
decode_signed_transaction 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.
Start from Algorand MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
172 Algorand MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.