AI agents call describe_sobject to retrieve information from Salesforce without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The 'describe' operation is a standard read-only API call that fetches structural metadata (fields, relationships, picklist values) about a Salesforce object. It has no side effects, creates no resources, and cannot delete or modify data. This is a safe information-retrieval operation with minimal blast radius if misused—an agent could only gather information about object schemas.
From the tool's definition Tool name 'describe_sobject' and description 'Describe a specific SObject using REST API' indicate a retrieval/query operation that returns metadata about Salesforce objects without modifying data.
Documented attack patterns abuse exactly the kind of access describe_sobject gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Salesforce, and nothing reaches the server without passing your rules. This is the rule we recommend for describe_sobject:
{
"version": "1",
"default": "deny",
"tools": {
"describe_sobject": {}
}
}describe_sobject is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Describe a specific SObject using REST API. It is categorised as a Read tool in the Salesforce MCP Server, which means it retrieves data without modifying state.
Register the Salesforce MCP server in PolicyLayer and add a rule for describe_sobject: 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 Salesforce. Nothing to install.
describe_sobject 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 describe_sobject 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 describe_sobject. 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.
describe_sobject is provided by the Salesforce MCP server (ryu-727/salesforce-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Salesforce, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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25 Salesforce tools catalogued and risk-classified — across an index of 43,000+ MCP servers.