AI agents use update_page 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.
update_page modifies existing page content/metadata in a Coda document reversibly. This is characteristic of Write-category tools. While the empty description reduces confidence slightly, the tool name and server context are unambiguous. Severity is medium because page updates in a shared document could affect multiple users, but changes are reversible unlike destructive operations.
From the tool's definition Tool name 'update_page' combined with server description stating it supports 'page...operations' on Coda.io documents indicates data modification.
Documented attack patterns abuse exactly the kind of access update_page 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 update_page:
{
"version": "1",
"default": "deny",
"tools": {
"update_page": {
"limits": [
{
"counter": "update_page_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_page 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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update_page. 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 update_page: 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.
update_page 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 update_page 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 update_page. 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.
update_page 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.
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24 Coda tools catalogued and risk-classified — across an index of 43,000+ MCP servers.