Compute Keccak-256 hash of hex-encoded data.
AI agents call hash_keccak256 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.
Hashing is a read-only operation that deterministically transforms input to output without creating, modifying, deleting, or executing external operations. The cryptographic nature does not change the categorization—it remains a pure computational function. Severity is low because misuse (e.g., an agent hashing arbitrary strings) causes no harm to systems or data.
From the tool's definition The tool 'hash_keccak256' computes a cryptographic hash (Keccak-256) of provided data and returns the result. It takes input and produces output with no side effects, data modification, or external state changes.
Attacks that exploit this kind of access
Compute Keccak-256 hash of hex-encoded data. 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 hash_keccak256: 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.
hash_keccak256 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 hash_keccak256 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 hash_keccak256. 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.
hash_keccak256 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →