wallet_sign_data
Sign arbitrary data with the active wallet account using raw Ed25519 (noble library, no Algorand SDK prefix). Returns hex signature.
This record as markdown: /tools/goplausible-algorand-mcp/wallet-sign-data.md
What wallet_sign_data does on Algorand MCP
AI agents invoke wallet_sign_data to trigger actions in Algorand MCP. 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 wallet_sign_data is rated High
This tool performs a cryptographic signing operation using the active wallet's private key. It executes an operation (signing) that has significant security implications — misuse could produce valid signatures over malicious payloads, authorize transactions, or be used to impersonate the wallet owner.
From the tool's definition Sign arbitrary data with the active wallet account using raw Ed25519 (noble library, no Algorand SDK prefix). Returns hex signature.
Attacks that exploit this kind of access
The rule that runs wallet_sign_data safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Algorand MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For wallet_sign_data, this is the rule to start with:
wallet_sign_data 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Algorand MCP, apply this rule, and every wallet_sign_data call is checked against it from then on.
Questions about wallet_sign_data
Sign arbitrary data with the active wallet account using raw Ed25519 (noble library, no Algorand SDK prefix). Returns hex signature. 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.
Register the Algorand MCP server in PolicyLayer and add a rule for wallet_sign_data: 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.
wallet_sign_data is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the wallet_sign_data 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 wallet_sign_data. 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.
wallet_sign_data 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.
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