GetOpenApiSchema
A read tool on the Twenty MCP server.
This record as markdown: /tools/jdu278-twenty-mcp-server/getopenapischema.md
What GetOpenApiSchema does on Twenty MCP Server
AI agents call GetOpenApiSchema to retrieve information from Twenty MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why GetOpenApiSchema is rated Low
This tool reads and returns OpenAPI schema information, which is a query/retrieval operation with no side effects. However, API schemas can contain sensitive structural information about endpoints and data models, which could be useful for reconnaissance in an attack; this elevates severity from low to medium. The tool itself performs no destructive, financial, or code execution actions.
From the tool's definition Tool name 'GetOpenApiSchema' and description 'Get Open Api Schema' indicate a retrieval operation that fetches schema metadata without modifying data.
Attacks that exploit this kind of access
The rule that runs GetOpenApiSchema safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Twenty MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For GetOpenApiSchema, this is the rule to start with:
GetOpenApiSchema is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Twenty MCP Server, apply this rule, and every GetOpenApiSchema call is checked against it from then on.
Questions about GetOpenApiSchema
GetOpenApiSchema is a read tool on the Twenty MCP Server MCP server. It is categorised as a Read tool in the Twenty MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Twenty MCP Server MCP server in PolicyLayer and add a rule for GetOpenApiSchema: 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 Twenty MCP Server. Nothing to install.
GetOpenApiSchema 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 GetOpenApiSchema 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 GetOpenApiSchema. 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.
GetOpenApiSchema is provided by the Twenty MCP Server MCP server (jdu278/twenty-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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