Get the FROST-Ed25519 secret share configuration for a wallet (threshold, total, share indices).
AI agents call get_key_shares to retrieve information from Tenzro Ledger MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a Read operation that retrieves wallet configuration details. However, severity is elevated to 'high' because the returned data (FROST-Ed25519 secret share configuration including threshold and share indices) is cryptographically sensitive information. Exposure of this configuration could enable threshold cryptography attacks or help reconstruct private keys if combined with other shares.
From the tool's definition Tool name 'get_key_shares' with description 'Get the FROST-Ed25519 secret share configuration for a wallet (threshold, total, share indices).' — retrieves configuration data about cryptographic key shares without modifying or executing anything.
Attacks that exploit this kind of access
Get the FROST-Ed25519 secret share configuration for a wallet (threshold, total, share indices). It is categorised as a Read tool in the Tenzro Ledger MCP MCP Server, which means it retrieves data without modifying state.
Register the Tenzro Ledger MCP server in PolicyLayer and add a rule for get_key_shares: 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 Tenzro Ledger MCP. Nothing to install.
get_key_shares 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 get_key_shares 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 get_key_shares. 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.
get_key_shares is provided by the Tenzro Ledger MCP server (https://canton-mcp.tenzro.network/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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