Add content to the beginning of an existing Quip document
AI agents use prepend_content to create or update resources in Quip — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Quip environment.
This tool creates or modifies data (prepends text to a document) but the modification is reversible—content can be edited, deleted, or undone. It does not delete, destroy, or permanently erase data, nor does it execute code or handle financial transactions. Therefore, it is classified as Write rather than Destructive or Execute.
From the tool's definition Tool description states 'Add content to the beginning of an existing Quip document', which modifies document content.
Documented attack patterns abuse exactly the kind of access prepend_content gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Quip, and nothing reaches the server without passing your rules. This is the rule we recommend for prepend_content:
{
"version": "1",
"default": "deny",
"tools": {
"prepend_content": {
"limits": [
{
"counter": "prepend_content_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}prepend_content 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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Add content to the beginning of an existing Quip document. It is categorised as a Write tool in the Quip MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Quip MCP server in PolicyLayer and add a rule for prepend_content: 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 Quip. Nothing to install.
prepend_content 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 prepend_content 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 prepend_content. 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.
prepend_content is provided by the Quip MCP server (petertilsen/quip-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Quip, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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8 Quip tools catalogued and risk-classified — across an index of 43,000+ MCP servers.