Insert new rows or update existing rows in a table based on key columns - ideal for bulk operations
AI agents use upsert_rows to create or update resources in Coda — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Coda environment.
The upsert_rows tool performs bulk row creation and modification in Coda tables. While upsert operations are reversible (rows can be updated again or deleted), the high-severity rating reflects the potential blast radius of bulk modifications affecting multiple rows at once, which could inadvertently overwrite or corrupt significant amounts of data if misapplied.
From the tool's definition Tool description explicitly states 'Insert new rows or update existing rows in a table' — reversible create/modify operations. The 'upsert' pattern (insert-or-update) is fundamentally a Write operation.
Documented attack patterns abuse exactly the kind of access upsert_rows gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Coda, and nothing reaches the server without passing your rules. This is the rule we recommend for upsert_rows:
{
"version": "1",
"default": "deny",
"tools": {
"upsert_rows": {
"limits": [
{
"counter": "upsert_rows_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}upsert_rows 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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Insert new rows or update existing rows in a table based on key columns - ideal for bulk operations. It is categorised as a Write tool in the Coda MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Coda MCP server in PolicyLayer and add a rule for upsert_rows: 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 Coda. Nothing to install.
upsert_rows 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 upsert_rows 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 upsert_rows. 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.
upsert_rows is provided by the Coda MCP server (tjc-lp/coda-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Coda, 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.
24 Coda tools catalogued and risk-classified — across an index of 43,000+ MCP servers.