AI agents call get_bitcoin_transactions to retrieve information from Zerion without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves past Bitcoin transaction records for a given address. It performs a read-only operation with no side effects—it neither modifies state, executes external code, deletes data, nor moves funds. The limit of 25 transactions reinforces its informational purpose.
From the tool's definition Tool name 'get_bitcoin_transactions' and description 'Get recent transaction history for a Bitcoin address' indicate retrieval of historical transaction data with no modification capability.
Attacks that exploit this kind of access
Get recent transaction history for a Bitcoin address (up to last 25 txs). It is categorised as a Read tool in the Zerion MCP Server, which means it retrieves data without modifying state.
Register the Zerion MCP server in PolicyLayer and add a rule for get_bitcoin_transactions: 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 Zerion. Nothing to install.
get_bitcoin_transactions 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_bitcoin_transactions 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_bitcoin_transactions. 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_bitcoin_transactions is provided by the Zerion MCP server (rockyale/zerion-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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