get-balance · Lineage MCP Server MCP: Risk & Policy

WHAT IT DOES

What get-balance does on Lineage MCP Server

AI agents call get-balance to retrieve information from Lineage MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

WHY IT NEEDS A POLICY

Why get-balance needs a policy

Despite the empty tool description, the name 'get-balance' combined with the server description explicitly mentioning 'balance queries' and sibling read-only blockchain query tools clearly indicates this retrieves wallet or account balance information. This is a Read operation (query/fetch with no side effects).

From the tool's definition Tool named 'get-balance' with sibling tools 'fetch-balance', 'fetch-transactions', 'get-block-by-number', 'get-entry-by-hash', 'get-issued-supply', 'get-latest-block', 'get-total-supply', 'get-transaction-by-hash' and server description stating 'balance…

Attacks that exploit this kind of access

Questions about get-balance

What does the get-balance tool do? +

get-balance. It is categorised as a Read tool in the Lineage MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get-balance? +

Register the Lineage MCP Server MCP server in PolicyLayer and add a rule for get-balance: 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 Lineage MCP Server. Nothing to install.

What risk level is get-balance? +

get-balance is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get-balance? +

Yes. Add a rate_limit block to the get-balance 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.

How do I block get-balance completely? +

Set action: deny in the PolicyLayer policy for get-balance. 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.

What MCP server provides get-balance? +

get-balance is provided by the Lineage MCP Server MCP server (lineage-foundation/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.