Get schema definitions, field types, and enum values for Harvest entities. Use to understand available fields, data types, and valid values. No authentication required.
AI agents call harvest_get_schema to retrieve information from Harvest MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves schema information—a read-only operation that queries structural metadata about Harvest entities. It does not create, modify, delete, or execute any operations on actual data or external systems. The lack of authentication requirement further confirms it is a harmless informational endpoint.
From the tool's definition Tool name contains 'get_schema'; description states 'Get schema definitions, field types, and enum values' and explicitly notes 'No authentication required.' This is a metadata/introspection operation with no side effects.
Documented attack patterns abuse exactly the kind of access harvest_get_schema gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Harvest MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for harvest_get_schema:
{
"version": "1",
"default": "deny",
"tools": {
"harvest_get_schema": {}
}
}harvest_get_schema is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Get schema definitions, field types, and enum values for Harvest entities. Use to understand available fields, data types, and valid values. No authentication required. It is categorised as a Read tool in the Harvest MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Harvest MCP Server MCP server in PolicyLayer and add a rule for harvest_get_schema: 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 Harvest MCP Server. Nothing to install.
harvest_get_schema 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 harvest_get_schema 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 harvest_get_schema. 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.
harvest_get_schema is provided by the Harvest MCP Server MCP server (southleft/harvest-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Harvest MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
21 Harvest MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.