Query active DAML contracts. template_ids must contain at least one
AI agents call canton_list_contracts 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 tool retrieves data from a ledger by querying DAML contracts. The keyword 'Query' and the use of 'list' indicate a read-only operation with no side effects. No data is created, modified, deleted, or executed. While it operates on a financial/ledger system, the tool itself is a simple data retrieval mechanism, making it a Read category risk with low severity.
From the tool's definition Tool name is 'canton_list_contracts' and description states 'Query active DAML contracts' — query is a read operation that retrieves contract information without modifying or executing code.
Attacks that exploit this kind of access
Query active DAML contracts. template_ids must contain at least one. 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 canton_list_contracts: 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.
canton_list_contracts 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 canton_list_contracts 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 canton_list_contracts. 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.
canton_list_contracts 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.
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