Find and replace text across a spreadsheet or within a specific sheet
AI agents use google_sheets_find_and_replace to create or update resources in Sage MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Sage MCP environment.
This tool modifies existing data in a spreadsheet by replacing text content. While it doesn't delete records outright, it overwrites existing cell values which could be partially reversible (if undo is available) but may not be via the API. It can affect large volumes of data across an entire spreadsheet, giving it a high blast radius — a broad find-and-replace could corrupt data across many cells or sheets.
From the tool's definition Find and replace text across a spreadsheet or within a specific sheet
Documented attack patterns abuse exactly the kind of access google_sheets_find_and_replace gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Sage MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for google_sheets_find_and_replace:
{
"version": "1",
"default": "deny",
"tools": {
"google_sheets_find_and_replace": {
"limits": [
{
"counter": "google_sheets_find_and_replace_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}google_sheets_find_and_replace stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Find and replace text across a spreadsheet or within a specific sheet. It is categorised as a Write tool in the Sage MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Sage MCP server in PolicyLayer and add a rule for google_sheets_find_and_replace: 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 Sage MCP. Nothing to install.
google_sheets_find_and_replace is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the google_sheets_find_and_replace 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 google_sheets_find_and_replace. 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.
google_sheets_find_and_replace is provided by the Sage MCP server (sagemcp/sagemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 359 Sage MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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359 Sage MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.