Read values from a specific range in a Google Sheet
AI agents call read_sheet_values to retrieve information from VaultAssist without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data from a Google Sheet without creating, modifying, deleting, or executing external operations. It is a pure read operation with minimal blast radius even if misused by an AI agent, as it only exposes existing data the agent is already authorized to access via OAuth 2.1.
From the tool's definition Tool name 'read_sheet_values' and description 'Read values from a specific range in a Google Sheet' explicitly indicate data retrieval with no modification or deletion.
Documented attack patterns abuse exactly the kind of access read_sheet_values gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and VaultAssist, and nothing reaches the server without passing your rules. This is the rule we recommend for read_sheet_values:
{
"version": "1",
"default": "deny",
"tools": {
"read_sheet_values": {}
}
}read_sheet_values is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Read values from a specific range in a Google Sheet. It is categorised as a Read tool in the VaultAssist MCP Server, which means it retrieves data without modifying state.
Register the VaultAssist MCP server in PolicyLayer and add a rule for read_sheet_values: 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 VaultAssist. Nothing to install.
read_sheet_values 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 read_sheet_values 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 read_sheet_values. 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.
read_sheet_values is provided by the VaultAssist MCP server (3xcaffeine/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from VaultAssist, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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79 VaultAssist tools catalogued and risk-classified — across an index of 43,000+ MCP servers.