List all available data sources for theHarvester, with information about API key requirements.
AI agents call theharvester_sources to retrieve information from theHarvester MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs a read-only operation that enumerates available data sources and their configuration details. While theHarvester as a whole is used for OSINT reconnaissance (a potentially sensitive activity), this specific tool merely lists what sources exist and their API requirements—no actual reconnaissance, data harvesting, or external scanning occurs.
From the tool's definition Tool description states it 'List[s] all available data sources for theHarvester, with information about API key requirements.' This is a query/list operation that retrieves metadata about available sources without executing reconnaissance or modifying data.
Attacks that exploit this kind of access
List all available data sources for theHarvester, with information about API key requirements. It is categorised as a Read tool in the theHarvester MCP Server MCP Server, which means it retrieves data without modifying state.
Register the theHarvester MCP Server MCP server in PolicyLayer and add a rule for theharvester_sources: 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 theHarvester MCP Server. Nothing to install.
theharvester_sources 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 theharvester_sources 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 theharvester_sources. 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.
theharvester_sources is provided by the theHarvester MCP Server MCP server (schwarztim/sec-theharvester-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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