Append content to an existing Quip document
AI agents use append_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.
Appending content to a document is a Write operation. It modifies existing data but does not delete or overwrite it irreversibly. Misuse could pollute documents with unwanted content, but changes can typically be undone, keeping severity at medium.
From the tool's definition 'Append content to an existing Quip document' — adds data to an existing document, a reversible write operation
Documented attack patterns abuse exactly the kind of access append_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 append_content:
{
"version": "1",
"default": "deny",
"tools": {
"append_content": {
"limits": [
{
"counter": "append_content_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}append_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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Append content to 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 append_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.
append_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 append_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 append_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.
append_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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