Subscribe to real-time blockchain events. Returns a subscription ID for streaming.
AI agents call subscribe_events_stream 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 real-time event data from the blockchain without creating, modifying, or deleting any state. It establishes a subscription stream for data consumption, which is fundamentally a Read operation. The blast radius is low because subscription failures or misuse would only affect the requesting agent's ability to monitor events, not cause harm to financial assets, blockchain state, or system integrity.
From the tool's definition Tool name and description indicate it 'Subscribe to real-time blockchain events' and 'Returns a subscription ID for streaming' — these are read-only operations that retrieve data without modifying or executing state changes.
Attacks that exploit this kind of access
Subscribe to real-time blockchain events. Returns a subscription ID for streaming. 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 subscribe_events_stream: 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.
subscribe_events_stream 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 subscribe_events_stream 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 subscribe_events_stream. 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.
subscribe_events_stream 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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