Update the target URL of an existing external hyperlink relationship.
AI agents use update_hyperlink to create or update resources in Docx — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Docx environment.
This tool modifies document content by changing hyperlink URLs. While the change is reversible (can be undone or re-edited), it alters the document structure and could redirect users to malicious URLs if misused by an agent. This fits the Write category (creates or modifies data reversibly) rather than Execute, as it does not run code or trigger external operations—it simply updates metadata within the document.
From the tool's definition Tool description states 'Update the target URL of an existing external hyperlink relationship.' The verb 'Update' combined with modifying a hyperlink target demonstrates reversible data modification.
Documented attack patterns abuse exactly the kind of access update_hyperlink gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Docx, and nothing reaches the server without passing your rules. This is the rule we recommend for update_hyperlink:
{
"version": "1",
"default": "deny",
"tools": {
"update_hyperlink": {
"limits": [
{
"counter": "update_hyperlink_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_hyperlink 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 the target URL of an existing external hyperlink relationship. It is categorised as a Write tool in the Docx MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Docx MCP server in PolicyLayer and add a rule for update_hyperlink: 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 Docx. Nothing to install.
update_hyperlink 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_hyperlink 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_hyperlink. 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_hyperlink is provided by the Docx MCP server (securityronin/docx-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Docx, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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219 Docx tools catalogued and risk-classified — across an index of 43,000+ MCP servers.