Replace contents of a document version
Risk signalsOverwrites document version content
Part of the Sanity server.
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AI agents use version_replace_document to create or modify resources in Sanity. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call version_replace_document repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Sanity.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"version_replace_document": {
"limits": [
{
"counter": "version_replace_document_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Sanity policy for all 36 tools.
These attack patterns abuse exactly the kind of access version_replace_document gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Replace contents of a document version. It is categorised as a Write tool in the Sanity MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Sanity MCP server in PolicyLayer and add a rule for version_replace_document: 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 Sanity. Nothing to install.
version_replace_document 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 version_replace_document 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 version_replace_document. 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.
version_replace_document is provided by the Sanity MCP server (@@sanity/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 36 Sanity tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.