Test connectivity to Sigma API and return server information
AI agents call heartbeat to retrieve information from Sigma MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
A heartbeat/ping tool only checks connectivity and returns server info. It performs no writes, executes no commands, and has no destructive or financial implications. Misuse potential is negligible.
From the tool's definition 'Test connectivity to Sigma API and return server information' — purely retrieves status/connectivity info with no side effects
Attacks that exploit this kind of access
Test connectivity to Sigma API and return server information. It is categorised as a Read tool in the Sigma MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Sigma MCP Server MCP server in PolicyLayer and add a rule for heartbeat: 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 Sigma MCP Server. Nothing to install.
heartbeat 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 heartbeat 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 heartbeat. 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.
heartbeat is provided by the Sigma MCP Server MCP server (ja2z/mcp-server). 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 →